Large slope instabilities have been frequently recognised in areas with different lithological (sedimentary, igneous, metamorphic rocks) and geological domains (cordillera, volcanic, etc.). Slow to very fast moving, complex mass movements have been recognized and sometimes described as strongly interrelated. Many types of slope instabilities can be grouped within this broad class, each presenting different types of hazard and risk. Some major aspects of these slope instabilities are still understudied and debated, namely:
- their regional distribution and relevance;
- triggering and controlling factors, including possible climatic changes;
- hydrological boundary conditions and evolution or control of internal hydrogeological conditions;
- mechanical controls in terms of physical mechanical properties of failure surfaces and shear zones
- dating of initial movements and reactivation episodes;
- style and state of past and present activity;
- passive and/or active control by structural-tectonic elements of the bedrock geology;
- possible styles of evolution and consequent modeling approaches;
- assessment of related hazard;
- influence of external anthropogenic factors and effects on structures and infrastructures (e.g. tunnels, dams, bridges);
- role on the general erosional and sediment yield regime at the local or mountain belt scale;
- best technologies and approaches for implementing a correct monitoring and warning system and for the interpretation of monitoring data in terms of landslide activity and behavior.

Study of these instabilities requires a multidisciplinary approach involving geology, geomorphology, geomechanics, hydro-geochemistry, and geophysics. These phenomena have been recognized on Earth as well as on other planetary bodies (e.g. Mars, Moon).
Trenching and drilling can be used for material characterization, recognition of episodes of activity, and sampling in slow slope movements. At the same time many different approaches can be used for monitoring and establishing of warning thresholds and systems for such phenomena.
Geophysical survey methods can be used to assess both the geometrical and geomechanical characteristics of the unstable mass. Different dating techniques can be applied to determine the age and stages of movement. Many modeling approaches can be applied to evaluate instability and failure (e.g. displacement and velocity thresholds), triggering mechanisms (e.g. rainfall, seismicity, volcanic eruption, deglaciation), failure propagation, rapid mass movements (rock avalanches, debris avalanches and flows), and related secondary failures (rock fall and debris flows).
Studies of hydraulic and hydrologic boundary conditions and hydrochemistry are involved, both at the moment of initial failure and, later, during reactivation. The impacts of such instabilities on structures and human activities can be substantial and of a variety of forms (e.g. deformation or failure of structures and infrastructure, burial of developed areas, etc.).
Furthermore, the local and regional sediment yield could be influenced by the landsliding activity and different landslides (e.g. type, size) can play different roles.

Co-organized as GM7.7/HS11.42, co-sponsored by JpGU
Convener: Giovanni Crosta | Co-conveners: Federico Agliardi, Masahiro Chigira, Irene Manzella
| Tue, 09 Apr, 14:00–18:00
Room L1
| Attendance Tue, 09 Apr, 10:45–12:30
Hall X3

Attendance time: Tuesday, 9 April 2019, 10:45–12:30 | Hall X3

Chairperson: G. Crosta
X3.132 |
Amulya Ratna Roul and Sarada Prasad Pradhan
X3.134 |
Chih-Yu Kuo, Pi-Wen Tsai, Yih-Chin Tai, Ya-Hsin Chan, Rou-Fei Chen, Ching-Weei Lin, and Kuo-Jen Chang
X3.135 |
A study of the causes of the 2016 damage to Zhangjiazhuang high-speed rail tunnel in Ledu, Qinghai, China
(withdrawn after no-show)
Tianjun Qi, Xingmin Meng, Guan Chen, Yi Zhang, and Xiaojun Su
X3.136 |
Chung-Hsing Chang, Ruey-Juin Rau, Chia-Han Tseng, and Choon-Muar Ker
X3.137 |
Luca Del Rio, Giulio Di Toro, Michele Fondriest, Marco Moro, Michele Saroli, Stefano Gori, Emanuela Falcucci, and Elena Spagnuolo
X3.138 |
Marta Della Seta, Carlo Esposito, Gian Marco Marmoni, and Salvatore Martino
X3.139 |
Yih-Chin Tai, Kun-Ding Li, Yu-Chen Wu, Chih-Yu Kuo, Rou-Fei Chen, and Ching-Weei Lin
X3.140 |
Exposure dating (10Be, 26Al) of the giant fossil landslide in Tibetan Plateau, China
Shibiao Bai and Jie Shu
X3.141 |
Michel Jaboyedoff, Antoine Guerin, François Noël, Fei Li, Marc-Henri Derron, Fabrizio Troilo, Davide Bertolo, and Patrick Patrick Thuegaz
X3.143 |
Assessment of slope stability at ground zero of the 20 September 2018 massive landslide event in Naga City, Cebu, Philippines
John Kenneth Suarez, Camille Cuadra, and Alfredo Mahar Francisco Lagmay
X3.144 |
Pablo Poulain, Anne Le Friant, Anne Mangeney, Enrique D. Fernández Nieto., Sylvain Viroulet, and Manuel J. Castro Díaz
X3.145 |
Nils Brückner, Denise Rüther, Roger Urgeles, and Monica Winsborrow
X3.146 |
Francesco Faccini, Franco Marco Elter, Paolo Allasia, Luca Berruti, Danilo Godone, Davide Notti, and Flavio Poggi
X3.147 |
Masahiro Chigira, Ching-Ying Tsou, and Daisuke Higaki
X3.149 |
Gokhan Cevikbilen, Murat Emre Haşal, Mustafa Hatipoğlu, and Recep İyisan
X3.150 |
Nadège Langet, Volker Oye, Kamran Iranpour, Lars Harald Blikra, and Lene Kristensen