川滇地区应变率场分布及其变化特征研究

Abstract

Abstract: Based on repeated GPS data, least square collocation method is used to calculate the strain parameters in the Sichuan—Yunnan region. We analyse regional strain rate field distribution and its variation characteristics and relationship between strain rate field distribution and earthquake occurrences. The results show that: (1) spatial distribution of strain rate which has some obvious change is greater than the error of GPS data at each time may be real tectonic deformation information; (2) results of maximum shear strain, first shear strain and second shear strain reflect that strike-slip faults have a significant control over deformation; (3) results of principal strain、 north—south strain and east—west strain reflect that influence range of the 2008 Wenchuan earthquake is larger; (4) the first shear strain rate reflect north—east and north—west shear deformation, the east—west, north—south strain and maximum shear strain are corresponding to earthquake of magnitude 6 or over in this region.

Key words: Strain rate field, GPS, Least square collocation, The Sichuan—Yunnan region

CLC Number:

P315.7

WEI Wen-xin, JIANG Zai-sen, LIU Xiao-xia, ZOU Zhen-yu. Distribution and Variation Characteristics of Strain Rate Field in the Sichuan—Yunnan Region[J]. EARTHQUAKE, 2015, 35(4): 11-20.

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Distribution and Variation Characteristics of Strain Rate Field in the Sichuan—Yunnan Region

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