The Shape and Duration of Earthquake Moment Release and Its Relation to Depth and Tectonic Regime from Broadband and Short-Period Waveform Stacks

这项研究包括分析中强震的宽频带和短周期震源特征，以及研究震源性质随深度、大小、震源机制和构造制度(如板岩热参数)的变化。首先，目前将继续进行国家台网和短周期区域台阵记录的深部地震宽带和短周期P波的叠加工作，以获得时间函数。其次，这种方法将扩展到中等到大的浅层地震的子集，具有矩和深度，使得破裂在模糊深度阶段到来之前终止，即地震上方地球表面的反射。其目标是比较30至650公里深度的地震的时间历史，并能够系统地描述浅层破裂终止的特征，这是一个隐藏在最常研究的大型浅层地震的深部阶段的过程。这组时间函数还将表征从浅层断层到深层断层的转变，这表明余震生产率随着深度的增加而下降，并有助于约束深层地震断层的机制。

9805008HoustonThis research involves the analysis of broadband and short-period earthquake source characteristics of moderate to great earthquakes, and examining variations of source properties with depth, size, focal mechanism, and tectonic regime (e.g. slab thermal parameter). First, current work will be continued on stacking broadband and short-period P waves of deep earthquakes recorded by the National Net and by short-period regional arrays to obtain time functions. Second, this approach will be extended to the subset of moderate to large shallow earthquakes with moment and depth such that rupture terminates before the arrival of obscuring depth phases, that is, reflections from the Earth's surface above the earthquake. The goal is to compare time histories of earthquakes from 30 to 650 km depth and enable the systematic characterization of shallow rupture termination, a process hidden in the depth phases of the most commonly studied large, shallow earthquakes. This set of time functions will also characterize the transition from shallow to deep faulting, suggested by the drop in aftershock productivity as depth increases, as well as help constrain the mechanism of deep seismic faulting.***