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

9805008休斯顿这项研究包括分析中强地震的宽频带和短周期震源特征，并考察震源性质随深度、大小、震源机制和构造体制（如板片热参数）的变化。 第一，继续对国家台网和短周期区域台阵记录的深源地震宽频带和短周期P波进行叠加，获得时间函数。 第二，这种方法将扩展到中大型浅层地震的时刻和深度的子集，使破裂终止之前的到来模糊的深度阶段，也就是说，从地球表面以上的地震反射。 目标是比较30至650公里深度的地震时间历史，并能够系统地描述浅层破裂终止，这是一个隐藏在最常研究的大型浅层地震深度阶段中的过程。 这组时间函数还将表征从浅断层到深断层的过渡，这是由余震生产力随深度增加而下降所暗示的，并且有助于限制深地震断层的机制。

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.***