摘要
利用钻孔体应变仪记录的全球大震,导出同震应变波参考震级m、双振幅A、应变波推移时间τ(在短周期地震仪上测量的P波起算)的关系式m=3.0+1.40lgτ+lgA,并取得以M震级为基准的尾波应变震级标度MD=4.08+1.04lgτ+0.74lgA,尾波的多点测量改善了7.0级以上大震MD的精度,与M比较的震级标准差为0.12,MD的震级标准差为0.10,该方法测量全球大震不存在震级"饱和"问题。
We use the data of drill-hole volume strain meter to determine the magnitudes of strong earthquakes a- round the world. We derive formulae as following： m = 3.0 ＋ 1.41ogr ＋ logA and Ma = 4. 08 ＋ 1. 041gr ＋ 0. 741gA. In these formulae, the seismic parameters include seismic magnitude m, double amplitude A and delay time r. The multi-points pickings up from the coda waves improve significantly the Mo magnitude precision of strong earthquake over 7.0. The standard deviation of MD is 0. 10 seismic scale units. When we use this method to calculate the seis- mic magnitude of strong earthquakes, there is no saturation problem of seismic magnitude.
出处
《四川地震》
2015年第2期23-27,共5页
Earthquake Research in Sichuan
基金
溧阳市科技项目课题(LC2013001)资助
关键词
体应变
同震应变波
大震
震级
a volume strain
co- seismic strain wave
strong earthquake
seismic magnitude
