加速度与水库诱发地震烈度关系研究

以地震圆盘形破裂位错模式为基础，并以新的思路，把震源应力降参数引入预测公式，得出了新的地震动加速度预测方程：lg（rap^qr）=Ca＋1/6lgMo＋5/6lg△σ，与传统的衰减关系不同，表明地震动加速度不仅与震源强度Mo有关，还与震源应力背景有关。在此基础上，利用水库诱发地震震中烈度Io。资料，详细分析研究了诱发地震动加速度、烈度与震级关系，并且从理论上讨论了水库诱发地震烈度与构造地震烈度的差异性以及力学原因，给出了水库诱发地震与震源参数间的几个统计关系：M=1．05Io-2．45；lgαo=-2．1＋1/4M＋5/6lg△σ；M=-3．6＋1．2Io-3．33lg△σ；lgα=0．3Io-3．0；震源破裂长度-震级关系：lgL=1/2M-1．87。这些关系式对了解水库诱发地震的破裂过程及灾害预测有实际的应用价值。

The relation between acceleration and intensity of reservoir induced earthquake

Based on disk-shaped dislocation model, the function for forecasting ground motion acceleration is calculated. We introduced stress drop into the function and obtained new relation 1 5 to forecast attenuation of ground motion acceleration, lg（rap^qr）=Ca＋1/6lgMo＋5/6lg△σ,Contrasting with traditional attenuation relation, we found ground motion acceleration not only correlated with magnitude but also with background stress in source region. Based above, using epicentral intensity data of reservoir induced earthquake Io, we obtained the relations between acceleration, intensity and magnitude of reservoir induced earthquake, then theoretically analyzed the intensity difference between reservoir induced earthquake and tectonic earthquake and its mechanical cause. We also obtained several statistical relations between source parameters of reservoir induced earthquake,M=1.05Io-2.45;lgαo=-2.1＋1/4M＋5/6lg△σ;M=-3.6＋1.2Io-3.33lg△σ;lgα=0.3Io-3.0;The relation 1 between magnitude and source rupture length,lgL=1/2M-1.87. These relations have practical values for realizing rupture process of reservoir induced earthquake and forecasting it.