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Title: Source complexity of the 2015 Mw 7.9 Bonin earthquake

The 30 May 2015 Mw 7.9 Bonin earthquake, one of the largest and deepest earthquakes ever recorded by modern seismology, provides a unique opportunity to study the source process and physical mechanisms of deep-focus earthquakes. We develop a novel back-projection technique that allows source imaging in full three-dimensional space with high depth resolution. Our results indicate an initial SW-NE bilateral source propagation followed by a northwest source extension. The multiple-source inversion reveals a two-step source process with propagating directions near-perpendicular to each other, consistent with the 3D back-projection result. The spatial distribution and focal mechanisms of the sub-events cannot be modeled by a single planar rupture, which may display a curved rupture plane or sub-events crossing multiple fault interfaces. Thus, the complex source process can be best explained by stress or structure heterogeneity within the deep slab.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ;  [2] ; ORCiD logo [3]
  1. Stony Brook Univ., NY (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of California, Los Angeles, CA (United States)
  3. Stony Brook Univ., NY (United States); Univ. of Science and Technology of China, Hefei (China). Lab. of Seismology and Physics of Earth's Interior and School of Earth and Space Sciences
Publication Date:
Report Number(s):
LA-UR-16-28661
Journal ID: ISSN 1525-2027
Grant/Contract Number:
AC52-06NA25396; EAR 1214215; EAR 1614609; EAR-1261681
Type:
Accepted Manuscript
Journal Name:
Geochemistry, Geophysics, Geosystems
Additional Journal Information:
Journal Volume: 19; Journal Issue: 7; Journal ID: ISSN 1525-2027
Publisher:
American Geophysical Union
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Earth Sciences; deep earthquake, source process, back-projection, multiple source inversion; deep earthquake; source complexity; back-projection; multiple-source inversion; slab heterogeneity
OSTI Identifier:
1459820

Chen, Yu, Meng, Lingsen, Zhang, Ailin, and Wen, Lianxing. Source complexity of the 2015 Mw 7.9 Bonin earthquake. United States: N. p., Web. doi:10.1029/2018GC007489.
Chen, Yu, Meng, Lingsen, Zhang, Ailin, & Wen, Lianxing. Source complexity of the 2015 Mw 7.9 Bonin earthquake. United States. doi:10.1029/2018GC007489.
Chen, Yu, Meng, Lingsen, Zhang, Ailin, and Wen, Lianxing. 2018. "Source complexity of the 2015 Mw 7.9 Bonin earthquake". United States. doi:10.1029/2018GC007489.
@article{osti_1459820,
title = {Source complexity of the 2015 Mw 7.9 Bonin earthquake},
author = {Chen, Yu and Meng, Lingsen and Zhang, Ailin and Wen, Lianxing},
abstractNote = {The 30 May 2015 Mw 7.9 Bonin earthquake, one of the largest and deepest earthquakes ever recorded by modern seismology, provides a unique opportunity to study the source process and physical mechanisms of deep-focus earthquakes. We develop a novel back-projection technique that allows source imaging in full three-dimensional space with high depth resolution. Our results indicate an initial SW-NE bilateral source propagation followed by a northwest source extension. The multiple-source inversion reveals a two-step source process with propagating directions near-perpendicular to each other, consistent with the 3D back-projection result. The spatial distribution and focal mechanisms of the sub-events cannot be modeled by a single planar rupture, which may display a curved rupture plane or sub-events crossing multiple fault interfaces. Thus, the complex source process can be best explained by stress or structure heterogeneity within the deep slab.},
doi = {10.1029/2018GC007489},
journal = {Geochemistry, Geophysics, Geosystems},
number = 7,
volume = 19,
place = {United States},
year = {2018},
month = {6}
}