Gravity Changes before and after the Wenchuan M_S8.0 Earthquake in the Northeastern Edge of Qinghai-Tibetan Block

详细信息   

• 责任者：Zhu Yiqing (Second Crust Monitoring and Application Center ; CEA ; Xi’an 710054 ; China) ; Liu Fang
• 刊名：Earthquake
• 出版年：2012
• 卷期：32(2)
• 关键词：汶川地震2008 ; Wenchuan earthquake 2008 ; 重力场 ; gravity field ; 青藏高原 ; Qinghai-Tibetan Plateau
• 页码：p.88-94
• 图表：3 illus., 18 refs.
• 分类号：0500
• issnNo：ISSN1000-3274
• isbnNo：CN11-1893/P

摘要

Temporal-spatial evolution of gravity field before the Wenchun M_S8. 0 earthquake was 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 were blocked by the Ordos Block. Regional gravity field 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 was affected by the Wenchun earthquake significantly.