Block Movement and Strain Characteristics Effected by Earthquake in Sichuan-Yunnan Region

doi:10.11947/j.AGCS.2018.20160311

Abstract

Abstract: In this paper, we studied the active blocks movement and deformation in the Sichuan-Yunnan region before and after the Wenchuan earthquake by using the measured velocity field of GNSS during the period from 1999 to 2007 and from 2009 to 2015. We established movement and strain model of active blocks before and after earthquake by introducing the translation-rotation-strain model, and effective to separate the blocks movement and blocks strain characteristics. According to this, the characteristics of the motion and strain of the block before and after the earthquake are analyzed. The results show that the Qiangtang block and Bayankala block to the East movement increases significantly, and after the Wenchuan earthquake is the biggest change in the boundary zone between Qiangtang block and South-China block, the compressive strain larger boundary section, and after the Wenchuan earthquake the relative extrusion movement increased significantly between Sichuan-Yunnan block and Qiangtang block, and South-China block and Bayankala block, but the relative motion between the South-China block and Sichuan-Yunnan block did not change significantly.

Key words: GNSS velocity field, active blocks, strain, Wenchuan earthquake

CLC Number:

P223

DANG Yamin, YANG Qiang, LIANG Shiming, WANG Wei. Block Movement and Strain Characteristics Effected by Earthquake in Sichuan-Yunnan Region[J]. Acta Geodaetica et Cartographica Sinica, 2018, 47(5): 559-566.

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