An Estimate of Fault Friction Properties and Stressing Rate from Aftershocks

9628458总体这项研究涉及通过应用Dieterich的速率和状态相关摩擦模型来估计地震活跃区的区域应力率，以确定大地震后余震的位置和时间。将该技术应用于1992年加利福尼亚州兰德斯7.6级地震，得到了122帕/天的应力速率。应力率的估计很重要，因为没有直接测量这一量的方法，这对地震危险性估计很重要。总体来说，Dieterich关系成功地预测了余震发生和衰减的时空特征，这一结论表明，随时间变化的摩擦适用于活动断裂。将该方法应用于北岭余震，可能会对洛杉矶盆地的应力累积速度提供新的约束。这项研究是国家减少地震灾害计划的一部分。***

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. ***