Temporal gravity changes before the 2008 Yutian Ms7.3 earthquake

Geodesy and Geodynamics

Yang Guangliang¹  Tan Hongbo¹  Liu Shaoming¹  Sun Shaoan¹  Xuan Songbai¹  Shen Chongyang¹  Li Hui¹ 

[1] Institute of Seismology, China Earthquake Administration, Wuhan 430071, China;

关键词: Yutian earthquake;    gravimetry;    dynamic change;    seismogeny;   

DOI  :  10.3724/SP.J.1246.2012.00019

来源: DOAJ

【 摘 要 】

Based on the data of the repeated gravity observation network in Chinese mainland since 1998, we analyzed the temporal changes of regional gravity field before the 2008 Yutian Ms7. 3 earthquake. The result shows some mid-to-long term (two to ten years) changes during the earthquake’s preparation. Notable features are a gravity increase lasting several years and a relatively large-scaled gradient zone of gravity change, the former indicating a continuous energy accumulation and the latter a possible location of seismic rupture. These gravity changes showed a trend of increase-accelerated increase-decelerated increase, similar to that of the Tangshan Ms7. 8 earthquake in 1976. The maximum accumulated gravity change related to the earthquake reached 200×10 −8 ms−2.

【 授权许可】

Unknown