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Abundant aftershock sequence of the 2015 M_w7.5 Hindu Kush intermediate-depth earthquake

Li, Chenyu and Peng, Zhigang and Yao, Dongdong and Guo, Hao and Zhan, Zhongwen and Zhang, Haijiang (2018) Abundant aftershock sequence of the 2015 M_w7.5 Hindu Kush intermediate-depth earthquake. Geophysical Journal International, 213 (2). pp. 1121-1134. ISSN 0956-540X. doi:10.1093/gji/ggy016.

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The 2015 M_w7.5 Hindu Kush earthquake occurred at a depth of 213 km beneath the Hindu Kush region of Afghanistan. While many early aftershocks were missing from the global earthquake catalogues, this sequence was recorded continuously by eight broad-band stations within 500 km. Here we use a waveform matching technique to systematically detect earthquakes around the main shock. More than 3000 events are detected within 35 d after the main shock, as compared with 42 listed in the Advanced National Seismic System catalogue (or 196 in the International Seismological Centre catalogue). The aftershock sequence generally follows the Omori's law with a decay constant p = 0.92. We also apply the recently developed double-pair double-difference technique to relocate all detected aftershocks. Most of them are located to the west of the hypocentre of the main shock, consistent with the westward propagation of the main-shock rupture. The aftershocks outline a nearly vertical southward dipping plane, which matches well with one of the nodal planes of the main shock. We conclude that the aftershock sequence of this intermediate-depth earthquake shares many similarities with those for shallow earthquakes and infer that there are some common mechanisms responsible for shallow and intermediate-depth earthquakes.

Item Type:Article
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URLURL TypeDescription
Li, Chenyu0000-0002-0442-6928
Peng, Zhigang0000-0002-0019-9860
Zhan, Zhongwen0000-0002-5586-2607
Additional Information:© 2018 The Author(s). Published by Oxford University Press on behalf of The Royal Astronomical Society. Accepted 2018 January 16. Received 2017 December 30; in original form 2017 July 17. Published: 23 January 2018. The seismic data of network IU and TJ are obtained from IRIS DMC (; We are also grateful to Dr. Jing Wu in Chinese Academy of Sciences and Dr. Xiaofeng Meng in University of Southern California for their help and valuable advice on the matched-filter technique method and analysis of results. CL, ZP and DY are supported by NSF grant EAR-1551022.
Group:Seismological Laboratory
Funding AgencyGrant Number
Subject Keywords:Earthquake interaction, forecasting, and prediction; Seismicity and tectonics; Statistical seismology; Subduction zone processes
Issue or Number:2
Record Number:CaltechAUTHORS:20181114-152304604
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Official Citation:Chenyu Li, Zhigang Peng, Dongdong Yao, Hao Guo, Zhongwen Zhan, Haijiang Zhang; Abundant aftershock sequence of the 2015 Mw7.5 Hindu Kush intermediate-depth earthquake, Geophysical Journal International, Volume 213, Issue 2, 1 May 2018, Pages 1121–1134,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90895
Deposited By: Tony Diaz
Deposited On:14 Nov 2018 23:38
Last Modified:16 Nov 2021 03:36

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