Rock strength, (paleo)stress, fluids, and seismicity: methods, applications and implications for tectonics and mechanics
Co-organized by SM4
Convener:
Moritz Ziegler
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Co-conveners:
Olivier Lacombe,
Lisa Eberhard,
Gian Maria Bocchini,
Christophe Pascal,
Thomas P. Ferrand,
Armin Dielforder
Orals
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Fri, 19 Apr, 08:30–12:25 (CEST) Room K1
Posters on site
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Attendance Fri, 19 Apr, 16:15–18:00 (CEST) | Display Fri, 19 Apr, 14:00–18:00 Hall X2
One difficulty in constraining strength and stress is their variability in space and time, also because we do not fully understand the factors causing the variability. Fluids are known to reduce rock strength and trigger seismicity by reducing effective stresses and driving mineral reaction, but their exact role in driving mechanical instabilities needs to be better understood, also with respect to other processes like transformation-driven stress transfers.
The current state of stress is mainly assessed on seismic focal mechanisms, fault monitoring and slip inversion, borehole data, and methods such as hydraulic fracturing to determine the magnitude of the applied stress. In addition, the paleostress (ancient state of stress) can be obtained by different methods such as paleopiezometry and fault slip inversion, which mainly yield the direction of paleo-stress axes and the stress ratio. However, full stress tensor remains difficult to determine and investigations typically cover specific spatial and/or temporal scales, with a limited view on possible heterogeneities in space and time. We have to deal with incomplete datasets, part of which are not openly accessible. We must therefore advance and develop mechanical concepts, experiments, measuring methods and data compilations, to refine the models.
This session is intended to bring together researchers from various fields and to facilitate transdisciplinary discussions. We seek contributions that advance the current understanding of the governing mechanics of seismotectonic processes including fluids, the paleo and current in-situ stress state and estimation methods, as well as the strain field of the Earth’s lithosphere.
08:30–08:35
5-minute convener introduction
Welcome & Part I: Earthquake mechanisms
08:35–08:45
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EGU24-21427
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On-site presentation
08:45–09:05
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EGU24-16752
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ECS
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solicited
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On-site presentation
09:05–09:15
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EGU24-19186
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On-site presentation
Part II: Stress and paleostress
09:15–09:25
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EGU24-3863
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ECS
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On-site presentation
09:25–09:35
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EGU24-16849
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ECS
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On-site presentation
09:35–09:45
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EGU24-9228
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On-site presentation
09:45–09:55
Earthquake induced residual stresses preserved in fault rocks exhumed from the lower crust
09:55–10:05
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EGU24-14306
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ECS
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On-site presentation
Coffee break
Chairpersons: Christophe Pascal, Moritz Ziegler
10:45–10:55
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EGU24-10900
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On-site presentation
10:55–11:05
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EGU24-5744
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On-site presentation
11:05–11:15
Reconstruction of the state of stress in the upper crust by borehole breakouts stress indicators
Part III: Stability of the crust
11:35–11:45
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EGU24-6650
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On-site presentation
11:45–11:55
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EGU24-7664
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On-site presentation
11:55–12:05
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EGU24-20951
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On-site presentation
12:05–12:15
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EGU24-16807
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ECS
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On-site presentation
12:15–12:25
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EGU24-17191
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ECS
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On-site presentation
X2.45
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EGU24-8186
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ECS
Nucleation Mechanism of the 2022 Ms6.8 Luding Earthquake in Sichuan, China: Insights from Lithospheric Effective Elastic Thickness and Numerical Simulation
(withdrawn after no-show)