岷山断块的发震构造与地震活动性分析

doi:10.12196/j.issn.1000-3274.2020.02.004

Abstract

Abstract: The Minshan block is located in the middle of South-North Seismic Structural Belt in China with complex regional geological structures, numerous active faults and frequent strong earthquakes. Maowen fault, Tazang fault, Minjiang fault and Huya fault are the main active faults in different directions constitute the boundary of the Minshan block. From 638 to 2017, 11 powerful earthquakes of magnitude 6 or above occurred in this region, and the 2017 Jiuzhaigou M_S7.0 earthquake is one of them. Based on the regional tectonic background, this paper summarizes the structural characteristics and seismicity characteristics of strong earthquakes occurring in Minshan block.and comprehensively analyses the seismogeological characteristics and seismic hazards in this area. It is concluded that: ① The spatial distribution of earthquakes is characterized by obvious zoning, the most destructive strong earthquake generating structures are the East-West boundary fault areas of Minshan block with strong activity, and the epicenter is located at the intersection or cutting position of two or more groups of active fault structures. ② the temporal distribution of earthquakes is characterized by migration and return and in-situ recurrence with the development of time. ③ The occurrence of destructive earthquakes along the East-West boundary of Minshan block has a certain time correlation. The seismic sequence of Huya fault in the east boundary from 1973 to 2017 is the seismic structural response of Minjiang fault in the west boundary from 1933 to 1960 about 40 years later. ④ Minshan block should be the potential danger area of strong earthquake in the future, and the potential dangerous area of strong earthquakes in the north-central section of Minjiang fault is the area worthy of further study in the near future.

Key words: The Minshan block, Seismicity, Seismic correlation, The Bayan Har block, The Tibetan Plateau

CLC Number:

P315.7

WAN Sen-lin, ZHANG Jun-long, LIU Ming-jun, HE Wei-Min, LI Hai-long, GUO Chang-bao, LI Zhi-min. Seismogenic Structure and Seismic Activity Analysis of Minshan Block[J]. EARTHQUAKE, 2020, 40(2): 49-70.

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Seismogenic Structure and Seismic Activity Analysis of Minshan Block

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