Japan Geoscience Union Meeting 2016

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International Session (Oral)

Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG20] Intermediate-depth and deep earthquakes: their origins and material properties of subducting slabs

Tue. May 24, 2016 10:45 AM - 12:15 PM 201A (2F)

Convener:*Keiko Kuge(Department of Geophysics, Graduate School of Science, Kyoto University), Saeko Kita(National Research Institute for Earth Science and Disaster Prevention), Alexandre Schubnel(CNRS), Geoffrey Abers(Cornell University, Department of Earth and Atmospheric Sciences, New York, USA), Chair:Alexandre Schubnel(CNRS), Tatsuhiko Hara(International Institute of Seismology and Earthquake Engineering, Building Research Institute)

The cause of intermediate-depth and deep earthquakes, which occur in subducting slabs at depth ranging from 60 to 700 km, is not yet understood. Explaining the origin and the source processes of these earthquakes remains a big challenge in geoscience. Metamorphic reactions such as dehydration embrittlement, phase transitions, thermal runway, and other phenomena have been suggested as causing the mechanical instability. Laboratory and numerical experiments, seismic observations, exhumed samples and other data may provide new constraints on these earthquakes. Thermal, electromagnetic, seismic structure in subducting slabs may constrain the material properties where earthquakes take place. The occurrence of these earthquakes may also be driven by the dynamics of subducting slabs and their interaction with surrounding mantle.
A wide range of scientific approaches is essential in order to further constrain our understanding the nature of intermediate-depth and deep earthquakes. This session offers an opportunity to share results from various kinds of scientific studies and interdisciplinary studies associated with these earthquakes and their surroundings. We welcome presentations based on data analysis studies from local to global seismic networks, seismotectonics, laboratory experimental studies of rocks under high-pressure conditions, theoretical studies, geodynamics, thermal structure, electrical conductivity structure and numerical modeling.

11:15 AM - 11:30 AM

[SCG20-09] Laboratory earthquakes triggered by metamorphic reactions during the eclogitization of blueschist

*Sarah Incel1, Alexandre Schubnel1, Nadège Hilairet2, Timm John3, Loïc Labrousse4, Thoams Ferrand1, Damien Deldicque1, Yanbin Wang5, Jörg Renner6, Christian Chopin1 (1.Ecole Normale Supérieure Paris, 24 Rue Lhomond, 75005 Paris, France, 2.CNRS-UMET, Université Lille, 59655 Villeneuve d'Ascq, France, 3.Freie Universität Berlin, Malteserstr. 74-100, 12249 Berlin, Germany, 4.Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris, France, 5.GeoSoilEnviroCARS, University of Chicago, Argonne,IL 60439, USA, 6.Ruhr Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany)

11:45 AM - 12:00 PM

[SCG20-11] Dehydration-driven stress transfer as a mechanism for lower Wadati-Benioff earthquakes

*Ferrand Pascal Thomas1, Nadège Hilairet2, Sarah Incel1, Damien Deldicque1, Julien Gasc3,4, Loïc Labrousse5, Joerg Renner6, Yanbin Wang4, Alexandre Schubnel1 (1.Ecole Normale Supérieure, UMR 8538, PSL Research University, Paris, 75005, France, 2.Unité Matériaux et Transformations, UMR 8207, Villeneuve d'Ascq, 59655, France, 3.Géosciences Montpellier, 34090, France, 4.GeoSoilEnviroCARS, University of Chicago, Argonne, IL 60439, USA, 5.Institut des Sciences de la Terre de Paris, Univeristé Pierre et Marie Curie, Paris, 75005, France, 6.Institut für Geologie, Mineralogie und Geophysik, Ruhr Universität Bochum, 44780, Germany)