汶川地震前后青藏高原东北缘重力场动态变化研究

Abstract

Abstract: Temporal-spatial evolution of gravity field before the Wenchun M_S8.0 earthquake has been analyzed systematically by integrally adjusting the gravity observation data from the northeastern edge of the Tibetan Plateau. The results show that deep material of Tibetan Plateau moved northeastward after Wenchun M_S8.0 earthquake, and some channels have been blocked by the Ordos block. Regional gravity field has changed significantly on a large spatial scale. After the Wenchun earthquake, gravity field changed non-uniformly between Liupanshan fault zone which borders land of Gan-Ning-Shan and the fault zone along the north edge of west Qinling mountains. This area has been affected by the Wenchun earthquake significantly.

Key words: Gravity field, Dynamic variation, Tectonics, Northeastern edge of the Qinghai-Tibet block, Wenchuan earthquake

CLC Number:

P315.7

ZHU Yi-qing, LIU Fang, FU Guang-yu, ZHAO Yun-feng. Gavity Changes before and after the Wenchuan M_S8.0 Earthquake in The Northeastern Edge of Qinghai-Tibet Block[J]. EARTHQUAKE, 2012, 32(2): 88-94.

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Gavity Changes before and after the Wenchuan M_S8.0 Earthquake in The Northeastern Edge of Qinghai-Tibet Block

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Gavity Changes before and after the Wenchuan MS8.0 Earthquake in The Northeastern Edge of Qinghai-Tibet Block

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Gavity Changes before and after the Wenchuan M_S8.0 Earthquake in The Northeastern Edge of Qinghai-Tibet Block