三峡秭归附近地区地震精定位研究  

STUDY ON ACCURATE RELOCATION OF EARTHQUAKES NEAR ZIGUI COUNTY IN THREE GORGES

作　　者：魏贵春[1,2] 张丽芬[1,2,3] 申学林[1,2] 陈俊华[1,2] 

机构地区：[1]中国地震局地震研究所(地震大地测量重点实验室),武汉430071 [2]中国地震局地壳应力研究所武汉科技创新基地,武汉430071 [3]中国地震局地球物理研究所,北京100081

出　　处：《大地测量与地球动力学》2013年第A01期68-70,75,共4页Journal of Geodesy and Geodynamics

基　　金：中国长江三峡集团公司专项基金(SXSN/3354);中国地震局地震研究所所长基金(IS201246114)

摘　　要：利用双差定位法对三峡数字遥测地震台网记录到的秭归附近地区2008—2011年的73个M≥1.0地震重新进行定位,得到58个定位结果。结果显示,精定位后在减小残差、控制震中分布和震源深度方面均有较大改进。震中平均误差为:南北向0.42 km,东西向0.63 km,垂直向1.53 km。精定位后显示,74%的地震事件深度分布在7 km左右,平均深度6.8 km。结合秭归附近地区地震活动情况,分析了该地区的地震趋势。Using double difference location method to relocate 73 earthquakes, which the magnitudes are grea- ter than M1.0 and the earthquakes were recorded by the telemetry digital seismological network near Zigui county in 2008 to 2011, and we obtained 58 location results. The results show that residual decreases, controlling epicenter distribution and focal depth are improved obviously after accurate relocation. The average error of relocation is 0.42 km in the NS direction, 0.63 km in the EW direction and 1.53 km in the vertically direction. About 74% earthquakes distributed among the depth of 7 km, the mean depth is 6.8 km. Combined with seismicity, the earthquake tendency of Zigui county is analyzed.

关 键 词：秭归附近地区 地震事件 双差定位法 蓄水 地震趋势 

分 类 号：P315.7[天文地球—地震学]