Low radiation efficiency of the intermediate-depth earthquakes in the Japan subduction zone
- Creators
- Ko, Justin Yen-Ting
- Kuo, Ban-Yuan
Abstract
Robust determination of earthquake source parameters over a continuous depth range is central to inferring rupture mechanisms dominant at different depths. We employed a cluster-event method to constrain the source parameters as well as along-path attenuation for earthquakes over 0–150 km depths and 4 orders of seismic moments in the Japan subduction zone. We found that corner frequency and stress drop increase with depth, whereas the radiated energy scaled by seismic moment declines with depth slightly. As a result, the radiation efficiency exhibits a notable deficit for events deeper than 60 km. Together these suggest an increased energy dissipation during faulting in ductile deformation regime, consistent with shear heating instability as an important faulting mechanism for intermediate-depth earthquakes.
Additional Information
© 2016 American Geophysical Union. Received 25 AUG 2016; Accepted 4 NOV 2016; Accepted article online 5 NOV 2016; Published online 26 NOV 2016. The authors thank Germán Prieto, Marine Denolle, and Editor Jeroen Ritsema for their critical questions and constructive comments, which much improved the revised manuscript. The authors are grateful to Hirro Kanamori for many useful discussions. The broadband seismic records were provided by F-net (http://www.fnet.bosai.go.jp/top.php) operated by National Research Institute for Earth Science and Disaster Resilience (NIED). The research was supported by Academia Sinica Thematic Project 2015-2017 and the Ministry of Science and Technology (MOST) of Taiwan under grant MOST-104-2116-M-001-024.Attached Files
Published - Ko_et_al-2016-Geophysical_Research_Letters.pdf
Supplemental Material - grl55219-sup-0001-SI.pdf
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Additional details
- Eprint ID
- 73547
- Resolver ID
- CaltechAUTHORS:20170119-101754185
- 2015-2017
- Academia Sinica
- MOST-104-2116-M-001-024
- Ministry of Science and Technology (Taipei)
- Created
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2017-01-19Created from EPrint's datestamp field
- Updated
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2021-11-11Created from EPrint's last_modified field