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The 25 March 2020 M_w 7.5 Paramushir, northern Kuril Islands earthquake and major (M_w ≥ 7.0) near-trench intraplate compressional faulting

Ye, Lingling and Lay, Thorne and Kanamori, Hiroo (2021) The 25 March 2020 M_w 7.5 Paramushir, northern Kuril Islands earthquake and major (M_w ≥ 7.0) near-trench intraplate compressional faulting. Earth and Planetary Science Letters, 556 . Art. No. 116728. ISSN 0012-821X. doi:10.1016/j.epsl.2020.116728.

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Large compressional-faulting earthquakes located relatively deep in oceanic lithosphere entering subduction zones are primarily caused by plate bending stress, but their timing, depth extent and size can be influenced by temporally-varying shear stress on the plate boundary. The 25 March 2020 M_W 7.5 event in the Pacific plate seaward of Paramushir Island (northern Kuril Islands), is among the largest recorded events of this type. Its rupture extends along a large-slip region in the southwestern portion of the 1952 Kamchatka M_W 9.0 rupture zone. This region has somewhat lower interplate coupling than the megathrust fault along Kamchatka to the northeast, but there could be 68 yrs of strain accumulation. The 2020 event is considered in the context of the 24 recorded major (M_W ≥ 7.0) near-trench intraplate compressional-faulting events. An updated compilation of temporally varying near-trench intraslab faulting relative to major interplate ruptures indicates that the stress cycles on the plate boundary influence both extensional and compressional near-trench faulting caused by plate bending. Particularly noteworthy are such events seaward of areas presumed to be in an advanced stage of their seismic cycle, including relatively shallow compressional events along the 1944 M_W 8.1 Tonankai, Japan rupture zone, along with activity along the 1952 Kamchatka and 1922 Chile rupture zones.

Item Type:Article
Related URLs:
URLURL TypeDescription ItemIncorporated Research Institutions for Seismology (IRIS) ItemGlobal Centroid Moment Tensor Solutions ItemNational Earthquake Information Center
Ye, Lingling0000-0002-8739-2072
Lay, Thorne0000-0003-2360-4213
Kanamori, Hiroo0000-0001-8219-9428
Alternate Title:The 25 March 2020 MW 7.5 Paramushir, northern Kuril Islands earthquake and major (MW ≥ 7.0) near-trench intraplate compressional faulting
Additional Information:© 2020 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license ( Received 26 September 2020, Revised 8 December 2020, Accepted 16 December 2020, Available online 5 January 2021. Teleseismic waveforms were downloaded from the Incorporated Research Institutions for Seismology (IRIS) data management center ( Global Centroid Moment Tensor Solutions are from We use the earthquake catalog from National Earthquake Information Center at U.S. Geological Survey (USGS-NEIC) ( We thank Nadav Wetzler and an anonymous reviewer for their constructive reviews of the original manuscript. Lingling Ye's earthquake study is supported by National Natural Science Foundation of China (No. 41874056) and Fundamental Research Funds for the Central Universities, Sun Yat-sen University (No. 19lgzd11). Thorne Lay's earthquake research is supported by the U.S. National Science Foundation (Grant EAR1802364). CRediT authorship contribution statement: LY performed the finite-fault inversion for the 2020 event. HK performed the W-phase inversion. TL performed the time-dependent analysis of near-trench sequences. LY, TL and HK conceived the project, jointly interpreted the result and wrote the manuscript collaboratively. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Group:Seismological Laboratory
Funding AgencyGrant Number
National Natural Science Foundation of China41874056
Sun Yat-sen University19lgzd11
Subject Keywords:near-trench intraplate compressional faulting; 2020 Kuril slab earthquake; slab bending earthquakes; outer trench slope faulting temporal cycles
Record Number:CaltechAUTHORS:20210107-095953015
Persistent URL:
Official Citation:Lingling Ye, Thorne Lay, Hiroo Kanamori, The 25 March 2020 MW 7.5 Paramushir, northern Kuril Islands earthquake and major (MW ≥ 7.0) near-trench intraplate compressional faulting, Earth and Planetary Science Letters, Volume 556, 2021, 116728, ISSN 0012-821X, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107357
Deposited By: Tony Diaz
Deposited On:08 Jan 2021 18:51
Last Modified:16 Nov 2021 19:02

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