摘要
根据Schaff和Richards[1]对"重复地震"的定义,利用波形相关识别出首都圈地区2002～2006年发生的"重复地震事件".对宽频带/甚宽带和短周期记录,分别采用0.5～5.0Hz、1.0～5.0Hz带通滤波,识别出859例"重复地震"事件,占总数约24%.假定"重复地震对"间的距离小于1km,地震台网测得的两个地震之间的距离系台网定位误差所致,而相应的震相走时差为人工拾取误差,给出了首都圈数字地震台网的定位精度估计.结果显示观测条件较好的首都圈东北部地区平均定位精度约为5km;西南部地区约为13km,是观测条件有待改善地区.
Location capability and its spatial distribution of the Beijing Capital Digital Seismograph Network were estimated using ‘repeating earthquakes＇ or ‘earthquake doublets＇ from 2002 to 2006. Taking the definition of waveform correlation by Schaff and Richards , it is assumed that the ‘repeating events’ or ‘doublets’ are separated by no more than 1km, the network-measured apparent distances of ‘doublets’ indicates the order of magnitudes of the location error, and the difference of travel times between the ‘repeating events’ indicates the error of phase picking. Waveforms of 0.5-5.0 Hz band-pass filtered BB/VBB recordings and 1.0-5. 0 Hz band-pass filtered SP recordings are cross-correlated, recognizing 859 ‘repeaters’, being 24% of the whole events. It is observed that the average accuracy of the routine location by the Beijing Capital Digital Seismograph Network is of the order of magnitudes of 5km in the northern part where seismic observational condition is better, and of 13km in the south and west part where seismic observational condition is to be improved.
出处
《地球物理学报》
SCIE
EI
CSCD
北大核心
2008年第3期817-827,共11页
Chinese Journal of Geophysics
基金
国家自然科学基金项目(40674018)
中国地震局地球物理研究所基本科研业务专项DQJB06B03资助
关键词
重复地震
地震定位
地震台网
首都圈
Repeating earthquakes, Earthquake location, Seismograph network, Beijing Capital Region
