2011 年云南盈江MS 5. 8 地震序列重定位

Relocation of MS5. 8 event of the 2011 Yingjiang earthquake sequence

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。

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．