2023年5月24日(水) 10:45 〜 11:45 302 (幕張メッセ国際会議場)

コンビーナ:大内 智博(愛媛大学地球深部ダイナミクス研究センター)、北 佐枝子(建築研究所)、Marina Manea(Computational Geodynamics Laboratory, Geosciences Center, National Autonomous University of Mexico)、大久保 蔵馬(防災科学技術研究所)、座長:大久保 蔵馬(防災科学技術研究所)、北 佐枝子(建築研究所)

At depths exceeding 30 km, where the pressure reaches >1 GPa, many regular earthquakes and slow slip events occur within/above subducting slabs. It remains to be fully revealed that the intraslab earthquakes at such high pressures are described with frictional processes commonly used to model crustal earthquakes. It has long been believed that breakdown of hydrous minerals and pressure-induced phase transitions of major minerals could trigger intraslab earthquakes. Aqueous fluid released from the hydrous minerals seem to be related with slow slip events and some earthquakes. However, our understanding of the link between such microscopic phenomena and macroscopic earthquakes is still poor. The purpose of this session is to share constraints and advances in the understanding of the mechanisms controlling the occurrence of intraslab earthquakes. We seek to formulate future directions of the interdisciplinary study of the occurrence of intraslab earthquakes from the viewpoint of seismology, geodynamics and mineral physics. We welcome presentations from a wide variety of scientific disciplines, including observational and theoretical seismology, seismotectonics, geodynamics, mineral and rock physics, geology, and numerical modeling. Studies related to the thermal and tectonic structures of the subducting slab are also welcomed.