Temporal and Spatial Characteristics of Small to Moderate Earthquake Apparent Stresses in the South Part of Tanlu Fault Belt and Adjacent Areas
详细信息
- 责任者：Li Fa (Earthquake Administration of Anhui Province ; Heifei 230031 ; China) ; Ge Ning
- 刊名：Earthquake
- 出版年：2012
- 卷期：32(4)
- 关键词：强震 ; strong earthquakes ; 小震 ; small seisms ; 地应力 ; geostress ; 郯庐断裂带 ; Tancheng-Lujiang Fault Zone
- 页码：p.53-61
- 图表：4 illus., 13 refs.
- 分类号：0500
- issnNo：ISSN1000-3274
- isbnNo：CN11-1893/P
摘要
tant; FONT: 12px/22px Arial, 宋体; WHITE-SPACE: normal; ORPHANS: 2; FLOAT: none; COLOR: rgb(36,36,36); WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">Based earthquake data recorded by the Anhui seismic network,using waveform analysis and inversion,we calculated small to moderate earthquake apparent stresses in the south part of the Tanlu fault belt and adjacent areas,analyzed their variation characteristics in time and space,discussed the corresponding relationship with earthquake moment and source parameters.The results show: ① Using earthquake source spectrum data,the obtained apparent stress value in the south part of Tanlu fault belt and adjacent areas is between 0.05~0.9 MPa,averaging 0.20 MPa,which is the background stress level of the region;② Temporal change shows apparent stresses continued to present abnormally high values before Huang Hai ML5.1 earthquake,Jiangxi Jiujiang ML6.0 earthquake and Henan Taikang ML5.0 earthquake,to be normal after earthquake.But after Jiangxi Jiujiang magnitude 6 earthquake,apparent stresses have again a high value anomaly,subsequently Anhui Dingyuan ML4.7 earthquake happened,to a certain extent show that the high level of apparent stress in the south part of the Tanlu fault belt and adjacent areas have a good corresponding relationship with strong earthquakes in East China;③ Spatial distribution shows high value area of apparent stress is relevant to the seismic radiation energy higher area,mainly lied in Jiashan-Chuzhou section and Lujiang county nearby,where Dingyuan magnitude 4.7 earthquake and Anqing magnitude 4.8 earthquake happened in succession;④ It is not obvious that apparent stress increases with earthquake moment,corner frequency basically has a negative correlation with earthquake moment.