龙滩水库区诱发地震危险性估计

THE ESTIMATION OF INDUCED EARTHQUAKE DANGER IN THE LONGTAN RESERVOIR REGION

摘要:

龙滩水库为待建工程。利用库坝区近年来发生的三个天然地震的资料,求得该区主压应力方向为N50°W。龙鱼和河池两地区发生的震群的Q值偏低,平均分别为360和23。对震源参数的测定结果表明,M₀与M_L呈线性相关,震源尺度a、应力降Δσ与M_L无相关性。估计水库建成后可能会诱发较强地震。

Abstract:

Based on 3 natural events of late in the area of Longtan reservoir which is to await construction, this paper obtains the principal compression of mean N50°W in direction and the Q-values of about 23 and 360, respectively. It is proved that there is linear dependence of seismic moment M₀ on magnitude M_L, and linear independence of mean source dimension a or stress drop △σ on M_L. It is estimated that after impounding, the reservoir is able to induce stronger earthquakes.