Temporal and Spatial Variation of Focal Dynamic Parameters in Southwest Yunnan before the 2007 MS6.4 Ning’er Earthquake
详细信息
- 责任者：Li Yan’e (Institute of Geophysics ; CEA ; Beijing 100081 ; China) ; Chen Xuezhong
- 刊名：Earthquake
- 出版年：2012
- 卷期：32(1)
- 关键词：地震前兆 ; precursor ; 震源 ; focus ; 云南 ; Yunnan Province
- 页码：p.28-39
- 图表：9 illus., 32 refs.
- 分类号：0500
- issnNo：ISSN1000-3274
- isbnNo：CN11-1893/P
摘要
On the condition of near-source,the Brune model is employed to determine the focal dynamic parameters of 98 ML≥2.5 earthquakes occurred in southwestern Yunnan Province during January 2005 to May 2007. Space-time variation characteristics of apparent and corner frequency before 2007 Ning’er MS6.4 earthquake in Yunnan Province on June 4, 2007 are analyzed. The results show that before Ning’er MS6.4 earthquake, high apparent stress (higher than 2.5×105 Pa) mainly concentrated in the area from Honghe fault to Wuliangshan fault,distribution of low apparent stress (higher than 2.5×105 Pa) was random and dispersed. Small corner frequency (smaller than 1.5 Hz) mainly concentrated in the area from Honghe fault to Wuliangshan fault, the range of distribution enlarged continuously with the frequency increase until the entire area was covered.