An Estimate of Fault Friction Properties and Stressing Rate from Aftershocks

这项研究涉及到在地震活跃地区的区域应力率的估计，方法是将Dieterich的速率和状态依赖的摩擦模型应用于一次大地震后余震的位置和时间。这项技术被应用于1992年加利福尼亚州兰德斯发生的7.6级地震，得到了122帕/天的应力率。应力率的估计是很重要的，因为没有直接测量这个量的方法，这对地震危险性的估计很重要。Dieterich关系成功地预测了余震发生和衰减的时空特征，这一总体结论表明，随时间变化的摩擦力适用于活动断层。将该方法应用于北岭余震，可以为洛杉矶盆地的应力积累速率提供新的约束条件。这项研究是国家减少地震危害计划的一个组成部分。＊＊＊

9628458 Gross This research involves the estimation of regional stress rates in seismically active areas by means of application of the rate and state-dependent friction model of Dieterich to the location and timing of aftershocks following a major earthquake. The technique was applied to the 1992 M=7.6 Landers, California, earthquake to derive a 122 Pa/day stress rate. The estimation of stress rates is important because there is no method of directly measuring this quantity, which is important for seismic hazard estimation. The overall conclusion that the Dieterich relation makes successful predictions about the spatial and temporal signature of aftershock generation and decay suggests that time dependent friction is applicable to active faults. Application of the method to the Northridge aftershocks may provide a new constraint on the rate of stress accumulation in the Los Angeles basin. This research is a component of the National Earthquake Hazard Reduction Program. ***