【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。更多还原

【Abstract】 We use the data of drill-hole volume strain meter to determine the magnitudes of strong earthquakes around the world. We derive formulae as following: m = 3. 0 + 1. 4logτ + log A and Md= 4. 08 + 1. 04lgτ + 0. 74 lgA.In these formulae,the seismic parameters include seismic magnitude m,double amplitude A and delay time τ. The multi-points pickings up from the coda waves improve significantly the MDmagnitude precision of strong earthquake over 7. 0. The standard deviation of MDis 0. 10 seismic scale units. When we use this method to calculate the seismic magnitude of strong earthquakes,there is no saturation problem of seismic magnitude.更多还原