摘要
根据上海台网观测记录到的上海及邻近地区1985年至1990年期间179次地震事件的资料,以虹桥台、南汇台的两口深井观测地震记录为例,探讨如何利用深井观测速度型记录的最大振幅来测定近震震级。对于400公里以内的地震,本文根据统计规律,提出:在已知系统速度灵敏度K,地震记录的最大振幅A和地震震中距Δ的前提下,速度型记录的近震震级可以表示为M_v=logA/K+blog(Δ)+c误差分析表明,M_v与M_L是比较接近的,结果是可用的。
Based on the data of 179 earthquakes from 1985 to 1990 in Shanghai and its adjacent area,for the records of the two bore-hole seismometers of Hongqiao and Nanhui seismic stations,we have studied how to determine the local magnitude by using the maximum amplitude of bore-hole velocity records.For the earthqua- kes within 400 km,we obtain the formala for the local magnitude of veloaty records Mv=log(A/K)+b~*log(D)+C Where A is the maximum amplitade of velocity,record,K is the system ve- locity sensibility,D is the epicentral distance,b and c are two constants. The error anlysis rkorss that the value M_v is quite well close of M_L,so the formula is validity.
出处
《地震地磁观测与研究》
1992年第6期51-59,共9页
Seismological and Geomagnetic Observation and Research
关键词
深井观测
速度型记录
震级
最大振幅
速度灵敏度
Bove-hole observation
Velocit yrecords
magnitude
Maxmum amplitude
Velocity sensibility
