The Temporal-spatial Variation Features of Gravity Field before and after the Fengqiu Earthquake Swarm in
详细信息
- 责任者：Qin Jianzeng (Geophysical Exploration Center ; CEA ; Zhengzhou 450002 ; China) ; Li Deqing
- 刊名：Northwestern Seismological Journal
- 出版年：2010
- 卷期：32(3)
- 关键词：小震 ; small seisms ; 重力场 ; gravity field ; 河南 ; Henan Province
- 页码：p.300-306
- 图表：7 illus., 14 refs.
- 分类号：0500
- issnNo：ISSN1000-0844
- isbnNo：CN62-1048/P
摘要
The variation features of gravity field and seismicity before and after the Fengqiu earthquake swarm are discussed based on the data of gravity monitoring network in border region of Hebei-Henan-Shandong provinces.The results show that the ascent→descent→ascent variations of the gravity field before the earthquake are the obvious reflection of medium-short-term anomalies in the gravity field,and the earthquake occurred during changing stage of acceleration.The dynamic images reflect clearly the evolutionary process of the gravity field in the seismogenic zone,i.e.quasi-homogeneous state→inhomogeneous state→earthquake occurrence.After the earthquakes,the gravity anomalies in this region did not recover.The prediction of Fengqiu earthquake according to the gravity anomalies is presented in the paper also.