Japan Geoscience Union Meeting 2021

Presentation information

[J] Oral

S (Solid Earth Sciences ) » S-SS Seismology

[S-SS08] Fault Rheology and Earthquake Physics

Fri. Jun 4, 2021 1:45 PM - 3:00 PM Ch.20 (Zoom Room 20)

convener:Shunya Kaneki(Disaster Prevention Research Institute, Kyoto University), Makiko Ohtani(Earthquake Research Institute, the University of Tokyo), Keishi Okazaki(Japan Agency for Marine-Earth Science and Technology), Keisuke Yoshida(Tohoku University), Chairperson:Keisuke Yoshida(Tohoku University), Makiko Ohtani(Earthquake Research Institute, the University of Tokyo)

2:30 PM - 2:45 PM

[SSS08-21] Intraslab repeating earthquakes beneath Japan; Implications for fluid-related embrittlement

*Junichi Nakajima1, Akira Hasegawa2 (1.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2.Graduate School of Science, Tohoku University)

Repeating earthquakes, or repeaters, are identical in location and geometry but occur at different times. Repeaters are most commonly found on creeping plate boundary faults, where seismic patches are loaded by surrounding slow slip. This study investigates whether repeating earthquakes occur in subducting slabs and finds the repeating earthquakes in the aftershock sequence of the 2003 Miyagi earthquake (M7.1). The occurrence of intraslab repeating earthquakes suggests that slow slip takes place even in the fault in the slab. In the presentation, we will talk about the systematic analysis of intraslab repeating earthquake beneath the Japanese Islands.