Structure-controlled asperities of the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes, NE Tibet, China, revealed by high-resolution seismic tomography

Abstract Detailed crustal structure of large earthquake source regions is of great significance for understanding the earthquake generation mechanism. Numerous large earthquakes have occurred in the NE Tibetan Plateau, including the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes. In this paper, we...

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Autores principales:	Quan Sun, Shunping Pei, Zhongxiong Cui, Yongshun John Chen, Yanbing Liu, Xiaotian Xue, Jiawei Li, Lei Li, Hong Zuo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6835743ca4324dafbe1bc6ad8ed3392e
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spelling	oai:doaj.org-article:6835743ca4324dafbe1bc6ad8ed3392e2021-12-02T15:53:03ZStructure-controlled asperities of the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes, NE Tibet, China, revealed by high-resolution seismic tomography10.1038/s41598-021-84642-72045-2322https://doaj.org/article/6835743ca4324dafbe1bc6ad8ed3392e2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84642-7https://doaj.org/toc/2045-2322Abstract Detailed crustal structure of large earthquake source regions is of great significance for understanding the earthquake generation mechanism. Numerous large earthquakes have occurred in the NE Tibetan Plateau, including the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes. In this paper, we obtained a high-resolution three-dimensional crustal velocity model around the source regions of these two large earthquakes using an improved double-difference seismic tomography method. High-velocity anomalies encompassing the seismogenic faults are observed to extend to depths of 15 km, suggesting the asperity (high-velocity area) plays an important role in the preparation process of large earthquakes. Asperities are strong in mechanical strength and could accumulate tectonic stress more easily in long frictional locking periods, large earthquakes are therefore prone to generate in these areas. If the close relationship between the aperity and high-velocity bodies is valid for most of the large earthquakes, it can be used to predict potential large earthquakes and estimate the seismogenic capability of faults in light of structure studies.Quan SunShunping PeiZhongxiong CuiYongshun John ChenYanbing LiuXiaotian XueJiawei LiLei LiHong ZuoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Quan Sun Shunping Pei Zhongxiong Cui Yongshun John Chen Yanbing Liu Xiaotian Xue Jiawei Li Lei Li Hong Zuo Structure-controlled asperities of the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes, NE Tibet, China, revealed by high-resolution seismic tomography
description	Abstract Detailed crustal structure of large earthquake source regions is of great significance for understanding the earthquake generation mechanism. Numerous large earthquakes have occurred in the NE Tibetan Plateau, including the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes. In this paper, we obtained a high-resolution three-dimensional crustal velocity model around the source regions of these two large earthquakes using an improved double-difference seismic tomography method. High-velocity anomalies encompassing the seismogenic faults are observed to extend to depths of 15 km, suggesting the asperity (high-velocity area) plays an important role in the preparation process of large earthquakes. Asperities are strong in mechanical strength and could accumulate tectonic stress more easily in long frictional locking periods, large earthquakes are therefore prone to generate in these areas. If the close relationship between the aperity and high-velocity bodies is valid for most of the large earthquakes, it can be used to predict potential large earthquakes and estimate the seismogenic capability of faults in light of structure studies.
format	article
author	Quan Sun Shunping Pei Zhongxiong Cui Yongshun John Chen Yanbing Liu Xiaotian Xue Jiawei Li Lei Li Hong Zuo
author_facet	Quan Sun Shunping Pei Zhongxiong Cui Yongshun John Chen Yanbing Liu Xiaotian Xue Jiawei Li Lei Li Hong Zuo
author_sort	Quan Sun
title	Structure-controlled asperities of the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes, NE Tibet, China, revealed by high-resolution seismic tomography
title_short	Structure-controlled asperities of the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes, NE Tibet, China, revealed by high-resolution seismic tomography
title_full	Structure-controlled asperities of the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes, NE Tibet, China, revealed by high-resolution seismic tomography
title_fullStr	Structure-controlled asperities of the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes, NE Tibet, China, revealed by high-resolution seismic tomography
title_full_unstemmed	Structure-controlled asperities of the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes, NE Tibet, China, revealed by high-resolution seismic tomography
title_sort	structure-controlled asperities of the 1920 haiyuan m8.5 and 1927 gulang m8 earthquakes, ne tibet, china, revealed by high-resolution seismic tomography
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6835743ca4324dafbe1bc6ad8ed3392e
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Structure-controlled asperities of the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes, NE Tibet, China, revealed by high-resolution seismic tomography

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