Numerous cases of induced/triggered seismicity resulting either directly or indirectly from injection/extraction associated with anthropogenic activity related to geo-resources exploration have been reported in the last decades. Induced earthquakes felt by the general public can often negatively affect public perception of geo-energies and may lead to the cancellation of important projects. Furthermore, large earthquakes may jeopardize wellbore stability and damage surface infrastructure. Thus, monitoring and modeling processes leading to fault slip, either seismic or aseismic, are critical to developing effective and reliable forecasting methodologies during deep underground exploitation. The complex interaction between injected fluids, subsurface geology, stress interactions, and resulting fault slip requires an interdisciplinary approach to understand the triggering mechanisms, and may require taking coupled thermo-hydro-mechanical-chemical processes into account.
In this session, we invite contributions from research aimed at investigating the interaction of the above processes during exploitation of underground resources, including hydrocarbon extraction, wastewater disposal, geothermal energy exploitation, hydraulic fracturing, gas storage and production, mining, and reservoir impoundment for hydro-energy. We particularly encourage novel contributions based on laboratory and underground near-fault experiments, numerical modeling, the spatio-temporal relationship between seismic properties, injection/extraction parameters, and/or geology, and fieldwork. Contributions covering both theoretical and experimental aspects of induced and triggered seismicity at multiple spatial and temporal scales are welcome.

Nonlinear behavior and anisotropic flow fields and transport are vital challenges for naturally fractured reservoir modelling and simulation. Naturally fractured reservoirs are of great importance in various disciplines such as hydrogeology, hydrocarbon reservoir management, nuclear waste repositories and geothermal reservoir engineering. This session addresses novel ideas as well as established concepts for the representation and numerical simulation of discontinuities and processes in fractured media.
The presence of fractures modifies the bulk physical properties of the original media by many orders of magnitudes, and they often introduce a strongly nonlinear behavior. Numerical modelling of such systems is especially challenging and often requires creative new ideas to solve, for example the use of stochastic models. This refers in particular to the mechanical properties via reduction of strength and stiffness.
Fractures also provide the main flow and transport pathways in the rock mass, dominating over the permeability of the rock matrix, as well as creating anisotropic flow fields and transport. Understanding the hydraulic and mechanical properties of fractures and fracture networks thus is crucial for predicting the movement of any fluid such as water, air, hydrocarbons, or CO2.
The geologist toolboxes for modelling fractured rocks and simulating processes in fractured media experiences constant extension and improvement. Contributions are welcome from the following topics:

• Deterministic or stochastic approaches for structural construction of fractured media,
• Continuous or discontinuous (DFN) modelling methods representing static hydraulic and/or mechanical characteristics of fractured media,
• Simulation of dynamic processes, hydraulic and/or mechanical behavior and THMC coupling in fractured media,
• Deterministic and stochastic inversion methods for calibrating numerical models of fractured media,
• Numerical modelling concepts of accounting for fractured properties specifically in groundwater, petroleum or geothermal management applications.

With field and laboratory studies from the same subjects please refer to the session: “Faults and fractures in geoenergy applications – monitoring, laboratory and field work results".

From the real-time integration of multi-parametric observations is expected the major contribution to the development of operational t-DASH systems suitable for supporting decision makers with continuously updated seismic hazard scenarios. A very preliminary step in this direction is the identification of those parameters (seismological, chemical, physical, biological, etc.) whose space-time dynamics and/or anomalous variability can be, to some extent, associated with the complex process of preparation of major earthquakes.
This session wants then to encourage studies devoted to demonstrate the added value of the introduction of specific, observations and/or data analysis methods within the t-DASH and StEF perspectives. Therefore, studies based on long-term data analyses, including different conditions of seismic activity, are particularly encouraged. Similarly welcome will be the presentation of infrastructures devoted to maintain and further develop our present observational capabilities of earthquake related phenomena also contributing in this way to build a global multi-parametric Earthquakes Observing System (EQuOS) to complement the existing GEOSS initiative.
To this aim this session is not addressed just to seismology and natural hazards scientists but also to geologist, atmospheric sciences and electromagnetism researchers, whose collaboration is particular important for fully understand mechanisms of earthquake preparation and their possible relation with other measurable quantities. For this reason, all contributions devoted to the description of genetic models of earthquake’s precursory phenomena are equally welcome.

Earthquake mechanics is controlled by a spectrum of processes covering a wide range of length scales, from tens of kilometres down to few nanometres. While the geometry of the fault/fracture network and its physical properties control the global stress distribution and the propagation/arrest of the seismic rupture, earthquake nucleation and fault weakening is governed by frictional processes occurring within extremely localized sub-planar slipping zones. The co-seismic rheology of the slipping zones themselves depends on deformation mechanisms and dissipative processes active at the scale of the grain or asperity. The study of such complex multiscale systems requires an interdisciplinary approach spanning from structural geology to seismology, geophysics, petrology, rupture modelling and experimental rock deformation. In this session we aim to convene contributions dealing with different aspects of earthquake mechanics at various depths and scales such as:

· the thermo-hydro-mechanical processes associated with co-seismic fault weakening based on rock deformation experiments, numerical simulations and microstructural studies of fault rocks;
· the study of natural and experimental fault rocks to investigate the nucleation mechanisms of intermediate and deep earthquakes in comparison to their shallow counterparts;
· the elastic, frictional and transport properties of fault rocks from the field (geophysical and hydrogeological data) to the laboratory scale (petrophysical and rock deformation studies);
· the internal architecture of seismogenic fault zones from field structural survey and geophysical investigations;
· the modeling of earthquake ruptures, off-fault dynamic stress fields and long-term mechanical evolution of realistic fault networks;
· the earthquake source energy budget and partitioning between fracture, friction and elastic wave radiation from seismological, theoretical and field observations.
· the interplay between fault geometry and earthquake rupture characteristics from seismological, geodetic, remote sensed or field observations;

We particularly welcome novel observations or innovative approaches to the study of earthquake faulting. Contributions from early career scientists are solicited.

Deformation microstructures (e.g. fabrics, textures, grain sizes, shapes, cracks etc) give insight into the conditions and processes of brittle failure and ductile flow of geomaterials. Microstructures and textures are a key tool in unraveling deformation histories and processes, kinematics and conditions in deformed rocks or ice. Processes such as grain-size reduction, phase changes, and development of crystallographic preferred orientations modify the rheological, elastic, and thermal properties of these rocks, providing key information on the evolution and dynamics of the litho- and cryosphere. In this session, we invite contributions based on microstructure and texture analysis from field observations, laboratory experiments, and numerical modelling that aim to constrain deformation mechanisms, physical and mechanical properties of geomaterials using well established or novel techniques.

Magmatic processes occurring at depth within magmatic plumbing systems are complex and play a fundamental role in controlling the tempo and style of volcanic activity, the formation of cumulate rocks and the generation of orthomagmatic and magmatic-hydrothermal ore deposits. To unravel the complexity and temporal evolution of magmatic plumbing systems a multidisciplinary approach is necessary. This session aims to bring together scientists working on the understanding of the structural, chemical and temporal evolution of magmatic systems using, for example, fieldwork, petrology, geochemistry, geophysics, geodesy, experiments or numerical modelling to diffuse the boundaries between disciplines and lead to a comprehensive understanding of the inner workings of Volcanic and Igneous Plumbing Systems (VIPS).

This session is sponsored by the IAVCEI Commission on Volcanic and Igneous Plumbing Systems.

The global-scale cycling of hydrogen, carbon, nitrogen, sulphur etc. controls the mass, composition and state of the outermost volatile layer of terrestrial planets over time, thereby controlling their habitability. These planetary volatile cycles involve the atmosphere, hydrosphere, crust, mantle and perhaps even core. On geological timescales, they are controlled by plate tectonics and mantle convection, but also by magmatism. Indeed, mantle melting is a key process that partitions (volatile) elements between the various planetary reservoirs. On Earth, for instance, ingassing and outgassing mainly occur at subduction zones, and major sites of volcanism (i.e., mid-ocean ridges and hotspots), respectively. Indeed, major volatile cycles are balanced to first order through ingassing and outgassing, particularly on plate-tectonic planets such as Earth. In planetary interiors, volatiles are partitioned into the existing minerals, or stabilize minor phases such as diamond or various hydrous phases in the mantle and crust, something that directly influences the spatial distribution of melt formation. Conversely, melt transport induces volatile exchanges between planetary reservoirs and favors outgassing. Understanding the complex dynamics (e.g., multi-phase flow) of melt/fluid segregation or accumulation is thus crucial for understanding global-scale volatile/material cycling. Further, melt retention as well as volatile content and speciation strongly and non-linearly affect rock properties such as viscosity, modal mineralogy, melting behavior, oxidation state, seismic velocity and attenuation, electrical conductivity and density.

In this session, we invite contributions from researchers in all disciplines of the Earth and Planetary Sciences that study volatile cycling and reservoir exchanges through fluid/melt percolation as well as magmatism from regional to global scales, and from short to long timescales. We also invite contributions such as, e.g., on the effects of volatiles on material properties, melt stabilization and planetary surface conditions, related observations or processes. Experimental, observational, modeling, and truly integrated multidisciplinary studies are highly welcome.

The goal of this session is to reconcile short-time/small-scale and long-time/large-scale observations, including geodynamic processes such as subduction, collision, rifting or mantle lithosphere interactions. Despite the remarkable advances in experimental rock mechanics, the implications of rock-mechanics data for large temporal and spatial scale tectonic processes are still not straightforward, since the latter are strongly controlled by local lithological stratification of the lithosphere, its thermal structure, fluid content, tectonic heritage, metamorphic reactions and deformation rates.

Mineral reactions have mechanical effects that may result in the development of pressure variations and thus are critical for interpreting microstructural and mineral composition observations. Such effects may fundamentally influence element transport properties and rheological behavior.
Here, we encourage presentations focused on the interplay between metamorphic processes and deformation on all scales, on the rheological behavior of crustal and mantle rocks and time scales of metamorphic reactions in order to discuss
(1) how and when up to GPa-level differential stress and pressure variations can be built and maintained at geological timescales and modelling of such systems,
(2) deviations from lithostatic pressure during metamorphism: fact or fiction?,
(3) the impact of deviations from lithostatic pressure on geodynamic reconstructions.
(4) the effect of porous fluid and partial melting on the long-term strength.
We therefore invite the researchers from different domains (rock mechanics, petrographic observations, geodynamic and thermo-mechanical modelling) to share their views on the way forward for improving our knowledge of the long-term rheology and chemo-thermo-mechanical behavior of the lithosphere and mantle.

Geological and geophysical data sets are in essence the result of physical processes governing the Earth’s evolution. Such data sets are widely varied and range from the internal structure of the Earth, plate kinematics, composition of geomaterials, estimation of physical conditions, dating of key geological events, thermal state of the Earth to more shallow processes such as natural and “engineered” reservoir dynamics and waste sequestration in the subsurface.

Combining such data with process-based numerical models is required for our understanding of the dynamical Earth. Process-based models are powerful tools to predict the evolution of complex natural systems resolving the feedback among various physical processes. Integrating high-quality data into numerical simulations leads to a constructive workflow to further constrain the key parameters within the models. Innovative inversion strategies, linking forward dynamic models with observables, is therefore an important research topic that will improve our knowledge of the governing physical parameters.

The complexity of geological systems arises from their multi-physics nature, as they combine hydrological, thermal, chemical and mechanical processes (e.g. thermo-mechanical convection). Multi-physics couplings are prone to nonlinear interactions ultimately leading to spontaneous localisation of flow and deformation. Understanding the couplings among those processes therefore requires the development of appropriate tools to capture spontaneous localisation and represents a challenging though essential research direction.

We invite contributions from the following two complementary themes:

#1 Computational advances associated with
- alternative spatial and/or temporal discretisation for existing forward/inverse models
- scalable HPC implementations of new and existing methodologies (GPUs / multi-core)
- solver and preconditioner developments
- AI / Machine learning-based approaches
- code and methodology comparisons (“benchmarks”)
- open source implementations for the community

#2 Physics advances associated with
- development of partial differential equations to describe geological processes
- inversion strategies and adjoint-based modelling
- numerical model validation through comparison with observables (data)
- scientific discovery enabled by 2D and 3D modelling
- utilisation of coupled models to explore nonlinear interactions

Rock deformation at different stress levels in the brittle regime and across the brittle-ductile transition is controlled by damage processes occurring on different spatial scales, from grain scale to fractured rock masse. These lead to a progressive increase of micro- and meso-crack intensity in the rock matrix and to the growth of inherited macro-fractures at rock mass scale. Coalescence of these fractures forms large-scale structures such as brittle fault zones and deep-seated rock slide shear zones. Diffuse or localized rock damage have a primary influence on rock properties (strength, elastic moduli, hydraulic and electric properties) and their evolution across multiple temporal scales spanning from geological times to highly dynamic phenomena as earthquakes, volcanic eruptions and landslides. In subcritical stress conditions, damage accumulation results in brittle creep processes key to the long-term evolution of geophysical, geomorphological and geo-engineering systems.
Damage and progressive failure processes must be considered to understand the time-dependent hydro-mechanical behaviour of faults (e.g. stick-slip vs asesismic creep), volcanic systems and slopes (e.g. slow rock slope deformation vs catastrophic rock slides), as well as the response of rock masses to stress perturbations induced by artificial excavations (tunnels, mines) and static or dynamic loadings. At the same time, damage processes control the brittle behaviour of the upper crust and are strongly influenced by intrinsic rock properties (strength, fabric, porosity, anisotropy), geological structures and their inherited damage, as well as by the evolving pressure-temperature with increasing depth and by fluid pressure, transport properties and chemistry. However, many complex relationships between these factors and rock damage are yet to be understood.
In this session we will bring together researchers from different communities interested in a better understanding of rock damage processes and consequence. We welcome innovative contributions on experimental studies (both in the laboratory and in situ), continuum / micromechanical analytical and numerical modelling, and applications to fault zones, reservoirs, slope instability and landscape evolution, and engineering applications. Studies adopting novel approaches and combined methodologies are particularly welcome.

Geophysical methods have a great potential for characterizing subsurface properties and processes to inform geological, reservoir, hydrological, and biogeochemical studies. In these contexts, the classically used geophysical tools only provide indirect information about subsurface heterogeneities, reservoir rocks characteristics, and associated processes (e.g. flow, transport, biogeochemical reactions). Petrophysical relationships hence have to be developed to provide links between physical properties (e.g. electrical conductivity, seismic velocity or attenuation) and the intrinsic parameters of interest (e.g. fluid content, hydraulic properties, pressure conditions). In addition, geophysical methods are increasingly deployed as time-lapse, or even continuous, and distributed monitoring tools on more and more complex environments. Here again, there is a great need for accurate and efficient physical relationships such that geophysical data can be correctly interpreted (e.g. included in fully coupled inversions).
Establishing such models requires multidisciplinary approaches since involved theoretical frameworks differ. Each physical property has its intrinsic dependence to pore-scale interfacial, geometrical, and biogeochemical properties or to external condition (such as pressure or temperature). Each associated geophysical method has its specific investigation depth and spatial resolution which adds a significant level of complexity in combining and scaling theoretical developments with laboratory studies/validations and/or with field experiments. Ultimately, as inferred from geophysics, one needs to know the poroelastic properties and effective stress in place at depth.
This session consequently invites contributions from various communities to share their models, their experiments, or their field tests and data in order to discuss about multidisciplinary ways to improve our knowledge on reservoir and near surface environment.

This session provides the opportunity for contributions that fall within the broad spectrum of Rock Physics, but are not directly appropriate to any of the other proposed sessions. We solicit contributions on theory and simulations, instrumentation, laboratory experiments and field measurements, data analysis and interpretation, as well as inversion and modelling techniques

Geological media are a strategic resource for the forthcoming energy transition and constitute an important ally in the fight to mitigate the adverse effects of climate change. Several energy and environmental processes in the subsurface involve multi-physical interactions between the porous and fractured rock and the fluids filling the voids: changes in pore pressure, temperature, and strain of the solid skeleton are superposed to chemical reactions. This characteristic has profound implications on the production of energy and the storage of waste. Forecasts are bounded to the adequate understanding of field data associated with thermo-hydro-mechano-chemical processes and predictive capabilities heavily rely on the quality of the integration between the input data (laboratory and field evidence) and the mathematical models describing the evolution of the multi-physical system. This session is dedicated to studies covering applications of carbon capture and storage (CCS), geothermal systems, gas storage, energy storage, mining, reservoir management, reservoir stimulation, fluid injection-induced seismicity and radioactive waste storage. Welcomed contributions include approaches based on analytical, numerical, multi-scale, data-driven and artificial intelligence methods as well as studies focused on laboratory characterization and on gathering and interpreting in-situ geological and geophysical evidence of the multi-physical behavior of rocks.

Geophysical imaging techniques are widely used to characterize structures and processes in the shallow subsurface. Methods include active imaging using seismic, (complex) electrical resistivity, electromagnetic, and ground-penetrating radar methods, as well as passive monitoring based on ambient noise or electrical self-potentials. Advances in experimental design, instrumentation, data acquisition, data processing, numerical modeling, and inversion constantly push the limits of spatial and temporal resolution. Despite these advances, the interpretation of geophysical images often remains ambiguous. Persistent challenges addressed in this session include optimal data acquisition strategies, (automated) data processing and error quantification, appropriate spatial and temporal regularization of model parameters, integration of non-geophysical measurements and geological realism into the imaging process, joint inversion, as well as the quantitative interpretation of tomograms through suitable petrophysical relations.

In light of these topics, we invite submissions concerning a broad spectrum of near-surface geophysical imaging methods and applications at different spatial and temporal scales. Novel developments in the combination of complementary measurement methods, machine learning, and process-monitoring applications are particularly welcome.

Invited speaker: Burke Minsley (USGS)

Our understanding of the iron cores in Earth and other bodies is progressing rapidly thanks to cross-fertilization between a number of observational, theoretical and experimental disciplines.

Improved seismic observations continue to provide better images and prompt refinements in structural and geodynamic models. Mineral physics provides constraints for dynamic, structural, and thermodynamic models. Improved constraints on the core heat budget, paleomagnetic observations of long-term magnetic field variations, and high-resolution numerical simulations promote the exploration of new dynamo mechanisms. Geomagnetic observations from both ground and satellite, along with magneto-hydrodynamic experiments, provide additional insight to our ever expanding view of planetary cores.

This session welcomes contributions from all disciplines, as well as interdisciplinary efforts, on attempts to proceed towards an integrated, self-consistent picture of planetary core structure, dynamics and history, and to understand their overwhelming complexity.

The analysis of the Earth's gravity and magnetic fields is becoming increasingly important in geosciences. Modern satellite missions are continuing to provide data with ever improving accuracy and nearly global, time-dependent coverage. The gravitational field plays an important role in climate research, as a record of and reference for the observation of mass transport. The study of the Earth's magnetic field and its temporal variations is yielding new insights into the behavior of its internal and external sources. Both gravity and magnetic data furthermore constitute primary sources of information also for the global characterization of other planets. Hence, there continues to be a need to develop new methods of analysis, at the global and local scales, and especially on their interface. For over two decades now, methods that combine global with local sensitivity, often in a multiresolution setting, have been developed: these include wavelets, radial basis functions, Slepian functions, splines, spherical cap harmonics, etc. One purpose of this session is to provide a forum for exchange of research projects, whether related to forward or inverse modeling, theoretical, computational, or observational studies.
Besides monitoring the variations of the gravity and magnetic fields, space geodetic techniques deliver time series describing changes of the surface geometry, sea level change variations or fluctuations in the Earth's orientation. However, geodetic observation systems usually measure the integral effect. Thus, analysis methods have to be applied to the geodetic time series for a better understanding of the relations between and within the components of the system Earth. The combination of data from various space geodetic and remote sensing techniques may allow for separating the integral measurements into individual contributions of the Earth system components. Presentations to time frequency analysis, to the detection of features of the temporal or spatial variability of signals existing in geodetic data and in geophysical models, as well as to the investigations on signal separation techniques, e.g. EOF, are highly appreciated. We further solicit papers on different prediction techniques e.g. least-squares, neural networks, Kalman filter or uni- or multivariate autoregressive methods to forecast Earth Orientation Parameters, which are needed for real-time transformation between celestial and terrestrial reference frames.

Gravity and magnetic field data contribute to a wide range of geo-scientific research, from imaging the structure of the earth and geodynamic processes (e.g. mass transport phenomena or deformation processes) to near surface investigations. The session is dedicated to contributions related to spatial and temporal variations of the Earth gravity and magnetic field at all scales. Contributions to modern potential field research are welcome, including instrumental issues, data processing techniques, interpretation methods, innovative applications of the results and data collected by modern satellite missions (e.g. GOCE, GRACE, Swarm), potential theory, as well as case histories.

Many regions of the Earth, from crust to core, exhibit anisotropic fabrics which can reveal much about geodynamic processes in the subsurface. These fabrics can exist at a variety of scales, from crystallographic orientations to regional structure alignments. In the past few decades, a tremendous body of multidisciplinary research has been dedicated to characterizing anisotropy in the solid Earth and understanding its geodynamical implications. This has included work in fields such as: (1) geophysics, to make in situ observations and construct models of anisotropic properties at a range of depths; (2) mineral physics, to explain the cause of some of these observations; and (3) numerical modelling, to relate the inferred fabrics to regional stress and flow regimes and, thus, geodynamic processes in the Earth. The study of anisotropy in the Solid Earth encompasses topics so diverse that it often appears fragmented according to regions of interest, e.g., the upper or lower crust, oceanic lithosphere, continental lithosphere, cratons, subduction zones, D'', or the inner core. The aim of this session is to bring together scientists working on different aspects of anisotropy to provide a comprehensive overview of the field. We encourage contributions from all disciplines of the earth sciences (including mineral physics, seismology, magnetotellurics, geodynamic modelling) focused on anisotropy at all scales and depths within the Earth.

Environmental systems often span spatial and temporal scales covering different orders of magnitude. The session is oriented in collecting studies relevant to understand multiscale aspects of these systems and in proposing adequate multi-platform and inter-disciplinary surveillance networks monitoring tools systems. It is especially aimed to emphasize the interaction between environmental processes occurring at different scales. In particular, a special attention is devoted to the studies focused on the development of new techniques and integrated instrumentation for multiscale monitoring high natural risk areas, such as: volcanic, seismic, energy exploitation, slope instability, floods, coastal instability, climate changes and other environmental context.
We expect contributions derived from several disciplines, such as applied geophysics, geology, seismology, geodesy, geochemistry, remote and proximal sensing, volcanology, geotechnical, soil science, marine geology, oceanography, climatology and meteorology. In this context, the contributions in analytical and numerical modeling of geological and environmental processes are also expected.
Finally, we stress that the inter-disciplinary studies that highlight the multiscale properties of natural processes analyzed and monitored by using several methodologies are welcome.

The Earth’s magnetic field is continuously monitored by a large number of geomagnetic observatories and satellites in low Earth orbit. The use of these measurements can play a significant role in the space weather era. They can be used to monitor space weather events, such as magnetic storms, substorms and geomagnetically induced currents, and furthermore they facilitate studies of dynamic solar-terrestrial events and of their interactions. These measurements can also be used to model the magnetic field of external origin which poses presently the largest problem for progress in geomagnetic field modeling.
The aim of this session is to collect new ideas and results on how magnetic field measurements (from geomagnetic observatories and satellites such as CHAMP, Swarm, CSES, ePOP and so on) can improve our knowledge in the space weather domain.

This session asks for contributions in the field of electromagnetic (EM) geophysical methods that are applied on scales ranging from the near-surface to the deep mantle. This includes new instrumentation and data acquisition methods, as well as mathematical and numerical improvements to data processing, modelling, and inversion applied to ground-based and off-shore measurements, airborne and satellite missions. We are interested in studies of EM applied to global induction, imaging regional scale tectonic, magmatic, or volcanic systems, in the search for hydrocarbon, geothermal, or mineral resources, and the investigation of near surface structure relevant to environmental, urban, and hydrological systems. Results from EM methods are often part of multi-disciplinary studies integrating data from rock physics and other geophysical, geochemical, and geological methods to investigate complex subsurface structures and their temporal evolution. Neighbouring fields of research encompass the study of natural and controlled EM sources, geo-magnetically induced currents, space weather, or geomagnetic field studies based on observatory data.

This session provides the opportunity for contributions that fall within the broad spectrum of Geomagnetism, but are not directly appropriate to any of the other proposed sessions. We solicit contributions on theory and simulations, instrumentation, laboratory experiments and field measurements, data analysis and interpretation, as well as inversion and modelling techniques.

Paleomagnetic and rock magnetic methods are important for assigning both absolute and relative time to geological sequences. Magnetostratigraphy and correlation to the Geological Polarity Time Scale (GPTS) constitute a standard dating and correlation tool in the Earth sciences, applicable to a wide variety of sedimentary rock types formed in different environments. Astronomically-forced climate cycles encoded by rock magnetics have enabled high-resolution time calibration of sedimentary sequences. These techniques allow improvement of the GPTS, better dating of the geological record, increased understanding of paleoclimatic and paleoenvironmental changes, and resolution of sedimentation dynamics in tectonically active basins. This session invites contributions that use magnetostratigraphy to date and correlate sedimentary sequences and rock magnetic measurements to assign high-resolution chronostratigraphy to sedimentary sequences.

This open session provides the opportunity for contributions that fall within the broad spectrum of Paleomagnetism but are not directly appropriate to any of the other proposed sessions. The session invites studies from all areas of paleomagnetism, rock and environmental magnetism which have an impact on climatic, stratigraphic, tectonic or environmental applications. This also includes new theoretical models or measurement techniques.

It is becoming increasingly apparent that continental rifting, breakup, and ocean spreading contain significant complexities not easily explained by standard models. Recent discoveries of the importance of obliquity during rifting and continental material far offshore, such as beneath Iceland, the Comoros, Kerguelen, Jan Mayen and Mauritius, challenges conventional tectonic models. The coincidence of many regions of anomalous intraplate- or on-ridge volcanism with continental material, often detected geochemically, hints at imminent breakthroughs in our geodynamic understanding of the ocean floor and rifting processes. New models for the complex dynamics of continental breakup, including precursory deformation and magmatism, the role of shearing, structural inheritance, the structure and meaning of magnetic anomalies, the structural variability at passive margins, the development of spreading centres and the difficult birth of new oceans are required. These models must account for the complex features that are observed, including hybrid crust, marginal ridges, rift axis migration, isolated blocks of heavily rotated lithosphere in the ocean, anomalous bathymetry, and the geochemistry of lavas.

In this session, we explore the formation, evolution, structure, composition and underlying mechanisms controlling the formation of complex oceanic regions and continental margins. We seek case histories from around the globe addressing different geoscience disciplines, such as marine geophysics, seismology, ocean drilling, geochemistry, plate kinematics, tectonics, structural geology, numerical and analogue modelling, sedimentology and geochronology. We particularly encourage cross-disciplinary presentations, thought-provoking studies that challenge conventions, and submissions from early career researchers.

Scientific ocean and continental drilling provides unique opportunities to investigate the workings of the interior of our planet, Earth’s cycles, natural hazards and the distribution of subsurface microbial life. The past and current scientific drilling programs IODP (International Ocean Discovery Program) and ICDP (International Continental Scientific Drilling Program) have brought major advances in many multidisciplinary fields of socio-economic relevance, such as climate and ecosystem evolution, palaeoceanography, the deep biosphere, deep crustal and tectonic processes, geodynamics and geohazards. This session encourages contributions that outline perspectives and visions for future drilling projects, in particular projects using a multi-platform approach, and invites contributions that present and/or review recent scientific results from deep Earth sampling and monitoring through ocean and continental drilling projects.
This year, a particular focus will be given on contributions based on sedimentary records from outcrops or the often more complete sedimentary sections recovered by scientific drilling that reconstruct sedimentary processes and their products preserved in deltas, canyons and submarine fans (former session SSP 2.9).

During the Neoproterozoic, the last era of the Precambrian, major transformations occurred in the surficial layers of the Earth (atmosphere, oceans, biosphere and cryosphere) and possibly also in the Earth’s deep interior with rapid True Polar Wander and instabilities of the Earth’s magnetic field (crystallization of the inner core?). The paleogeography of the lithosphere, located at the interface between the surface and deep interior, is central to understanding the evolution of these transformations. In this session, we welcome multi-disciplinary contributions focused on late Precambrian and early Paleozoic paleogeographic reconstructions and their potential relationships with processes occurring in Earth’s surficial layers and deep interior.

Constraining the past geomagnetic field variation is fundamental for several disciplines such as Geophysics, Stratigraphy, Volcanology, Palaeoclimatology, Human history, Archaeology etc. Despite the great effort made in recent years to improve both spatial and temporal coverages of palaeomagnetic data, fundamental properties of the field, such as the average strength and its spatial and temporal (short- and long-term) directional variations over time, remain topics of debate. The inherent difficulties in obtaining well distributed palaeomagnetic records and reliable palaeointensity data are reflected in the current palaeomagnetic databases. Available data are clearly biased toward the last 10 ka and mostly the northern latitudes. Even though, in recent years, our ability in selecting the most reliable data has improved, more data are still needed mostly from underrepresented geographical areas and temporal intervals.

This session welcomes abstracts presenting methodological advances, new directional and palaeointensity data, especially respecting the FAIR data management, as well as new palaeomagnetic reconstructions at local or global scale for a better understanding of the past behaviour of the Earth’s magnetic field. Contributions presenting relative palaeointensities, rock magnetic and micromagnetic investigation applied to address the palaeointensity and paleomagnetic determination issue are also welcome.

The recent methodological and instrumental advances in paleomagnetism and magnetic fabric research further increased their already high potential in solving geological, geophysical, and tectonic problems. Integrated paleomagnetic and magnetic fabric studies, together with structural geology and petrology, are very efficient tools in increasing our knowledge about sedimentological, tectonic or volcanic processes, both on regional and global scales. This session is intended to give an opportunity to present innovative theoretical or methodological works and their direct applications in various geological settings. Especially welcome are contributions combining paleomagnetic and magnetic fabric data, integrating various magnetic fabric techniques, combining magnetic fabric with other means of fabric analysis, or showing novel approaches in data evaluation and modelling. We also highly solicit contributions showing all aspects of paleomagnetic reconstructions, acquisition of characteristic remanence and remagnetisations applied to solving geotectonic problems.