摘要
利用双差定位法对阳江地区2004年1月—2007年5月ML≥1.5地震记录重新进行定位,结果显示,2004年9月17日阳江平冈4.9级地震前,阳江地区出现了北北西向及北西向两条ML≥2.0地震条带,其中北北西向条带与4.9级地震的震源机制解节面Ⅱ及断层破裂方位角方向一致,且在震前1月北北西向条带上的地震出现震源深度加深现象,4.9级地震发生在条带的东南端。
The Yangjiang earthquake sequences from January, 2004 to May, 2007 were relocated with the double - difference location algorithm. The results show that two ML ≥2.0 seismicity belts distributed in Yangjiang area before Yangjiang M4.9 earthquake occurred on 17th September, 2004, the direction of one belt was NNW and the other was NW. The direction of NNW ML 〉/2.0 seismicity belt was consistent with the direction of nodal plane II of focal mechanism and the focal rupture azimuth. The focal depth of NNW seismicity belt deepened gradually in one month before the M4.9 earthquake and it occurred at the southeast edge of NNW seismicity belt.
出处
《大地测量与地球动力学》
CSCD
北大核心
2009年第6期60-63,共4页
Journal of Geodesy and Geodynamics
基金
广东省科技计划项目(2006B37201010)
"十一五"国家科技支撑项目(2006BACO1B03-04-06)
关键词
双差定位
阳江地震
地震条带
震源深度
震源机制解
double-difference earthquake location
Yangjiang earthquake
seismicity belt
focal depth
focal mechanism solution
