Study on Temporal and Spatial Features of Stress Drop for Low-to-Moderate Earthquakes in
详细信息
- 责任者：Liu Lifang (Earthquake Administration of Yunnan Province ; Kunming 650224 ; China) ; Su Youjin
- 刊名：Journal of Seismological Research
- 出版年：2010
- 卷期：33(3)
- 关键词：地震前兆 ; precursor ; 应力降 ; stress drops ; 云南 ; Yunnan Province ; 四川 ; Sichuan Province
- 页码：p.314-319
- 图表：6 illus., 2 tables, 11 refs.
- 分类号：0500
- issnNo：ISSN1000-0666
- isbnNo：CN53-1062/P
摘要
Summary name="EnDivSummary">Based on Brune source model and by means of generalized inversion technique, the authors determined the stress drop (Δσ) of 2 121 earthquakes with ML2.0～5.3 in Yunnan region and those of 323 earthquakes with ML3.0~5.1 in Sichuan region, and the authors analyzed temporal and spatial features of the medium-small earthquakes in Yunnan and Sichuan Region. The results show that in Yunnan region the stress drop (Δσ) is 0.03~57.55 MPa. The earthquakes with Δσ≥10.0 MPa is 4.8% of the total, and the annual average of stress drop is 2.30~5.05 MPa. In Sichuan region, the stress drop is 0.19～47.47 MPa. The earthquakes with Δσ≥10.0 MPa is 21.7%, and the annual average of stress drop is 5.11～8.72 MPa. The earthquakes with Δσ≥10.0MPa mainly distribute from the Northwest to Northeast of Yunnnan region and along the boundary of Yunnan and Sichuan, especially in Longmenshan Mountain Fault Belt. The earthquakes with Δσ≥10.0 MPa in Longmenshan Mountain Fault Belt is 35.8%, and the annual average varies from 5.20 MPa to 12.09 MPa. The increase in the events with high stress drop from 2004 to 2007 reflects the high tectonic stress before the MS8.0 Wenchuan earthquake.
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