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Exploring Remote Triggering of Intermediate-depth Earthquakes in Japan following the 2004 M9.1 Sumatra and 2012 M8.6 Indian Ocean Earthquakes

Description: 

It is well established that large magnitude earthquakes, especially strike-slip events, can generate static and dynamic stress perturbations that are capable of triggering subsequent shallow earthquakes, deep tremors, and slow slip events at nearby and long-range distances. In particular, the 2004 Sumatra and the 2012 Indian Ocean earthquakes, with the moment magnitude (M_w) of 9.1 and 8.6, respectively, are known to be two of the largest events in the past two decades that have triggered seismic and aseismic events around the world. Most of those triggered events occurred at depths above 60 km. Only a few recent studies focused on remote dynamic triggering of intermediate-depth earthquakes (IDEQs) between 60-350 km depth. In this study, we use Japan Meteorological Agency (JMA) catalog combined with seismic waveform data provided by excellent seismic network coverage of Hi-net to investigate how IDEQs in Central and Northeastern Japan responded to the passage of seismic waves generated by these two large earthquakes. Preliminary results indicate that there are subtle increases in the number of IDEQs in the study region shortly following both mainshocks. We plan to further examine seismic waveforms long before and after both distant mainshocks to detect additional IDEQs in Central and Northeastern Japan. The obtained results can be used to better understand the stress sensitivity of structures hosting those IDEQs and their physical mechanisms.

Session: Structure and Properties of Subducting Slabs and Deep Earthquakes [Poster]

Type: Poster

Date: 4/19/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Phuc Mach

Student Presenter: Yes

Invited Presentation: 

Authors