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2011 年云南盈江MS 5. 8 地震序列重定位
赵小艳1, 韩立波2, 苏有锦1, 刘自凤1
1.云南省地震局,昆明市北辰大道842 号650091;2.中国地震局地球物理研究所,北京100081
摘要:
利用云南数字地震台网和腾冲火山台网记录的2011 年1 ~ 12 月震相数据,采用Hypo2000、HypoDD 定位方法对2011 年盈江MS5. 8 地震序列的前震、余震进行了重新定位。定位结果显示地震分布较定位前更为集中。前震活动主要沿大盈江断裂呈NE 走向分布。余震呈共轭分布:一支沿大盈江断裂呈NE 向分布,另一支沿垂直于大盈江断裂的隐伏错断呈SSE向分布。余震分布存在着稀疏段落,可能对应着前震主要破裂区域。
关键词:  地震定位  盈江地震序列  共轭地震
DOI:
分类号:
基金项目:国家“十二五”科技支撑计划(2012BAK19B01-07)资助
Relocation of MS5. 8 event of the 2011 Yingjiang earthquake sequence
Zhao Xiaoyan1, Han Libo2, Su Youjin1, Liu Zifeng1
1.Earthquake Administration of Yunnan Province,Kunming 650024,China;2.Institute of Geophysics,China Earthquake Administration,Beijing 100081,China
Abstract:
On the basis of earthquake phases recorded by the Yunnan Digital Seismic Network and the Tengchong volcano broadband seismic instruments in January ~ December,2011 and the location results by Hypo2000 absolute location methods as the initial value,we obtained the locations of the foreshocks and aftershocks of MS 5. 8 Yingjiang sequence with double-difference location method. Our results show that the relocated aftershocks have a conjugate characteristic: earthquakes dominantly occurred along the Dayingjiang fault in ENE direction and another extended toward the SSE along a blind fault which was vertical to the Dayingjiang fault. The seismicity gap of aftershocks happens to be the foreshocks intensive areas.
Key words:  Earthquake location  Yingjiang earthquake sequences  Conjugate earthquake