Characteristics of Crustal Structure and Their Relation with Major Earthquakes in Western China

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS 地球物理学报 Pub Date : 2015-01-01 DOI:10.1002/CJG2.20157
Jiang Di-Di, Jiang Wei-wei, Xu Yi, Hao Tian-yao, Huang Weijian, Yu Jing-feng
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引用次数: 4

Abstract

Major and/or great earthquakes frequently occured in western China, where exist many striking seismotectonic zones such as Tian Shan, Altay, Pamir and Kunlun Mountains. This paper analyzes the characteristics of the gravity field in western China, inverts the depth of Moho interface by the Parker-Oldenburg method with gravity data and seismic profiles. Through comparison with the results of seismic tomography inversion, we analyze crustal structure of the study area. The results show that the study area is significantly heterogeneous in crustal structure, with main orogenic belts of high-speed while basins and major depressions of low speed. The orogenic belts in the study area are generally Moho depression areas while the basins are the Moho uplift areas. According to the calculation results and epicenter distribution of the study area, we discuss the correlation between crustal structure and major earthquakes. The earthquakes in this region are closely related to crustal heterogeneity, which mainly happen around the crustal velocity change belts and in the regions with great crustal velocity differences. Under the effect of tectonic stress, these crustal non-uniform areas are prone to major earthquakes, which is one of the tectonic reasons for high seismicity in orogenic belts and near the boundary between basins and mountains in western China.
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中国西部地壳结构特征及其与大地震的关系
中国西部地区大、大地震频繁发生,天山、阿勒泰、帕米尔高原、昆仑山等地震构造带较为突出。本文分析了中国西部重力场特征,利用重力资料和地震剖面,采用Parker-Oldenburg法反演了莫霍界面深度。通过与地震层析成像反演结果的对比,分析了研究区地壳结构。结果表明:研究区地壳结构非均质性明显,以高速造山带为主,以低速盆地和坳陷为主;研究区内造山带多为莫霍坳陷区,盆地多为莫霍隆起区。根据计算结果和研究区的震中分布,讨论了地壳结构与大地震的相关性。该地区的地震与地壳非均质性密切相关,主要发生在地壳速度变化带周围和地壳速度差较大的地区。在构造应力的作用下,这些地壳不均匀区域容易发生大地震,这是中国西部造山带和盆山交界地区地震活动频繁的构造原因之一。
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来源期刊
地球物理学报
地球物理学报 地学-地球化学与地球物理
CiteScore
3.40
自引率
28.60%
发文量
9449
审稿时长
7.5 months
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