Evaluating Static and Dynamic Stress Transfer Triggering

建议摘要EAR0003505(PH#12x)标题：评估静态和动态应力传递触发PI：S.Gross，美国科罗拉多大学这项研究的目的是研究地震，特别是余震的触发。余震与主震之间的明显联系表明，主震触发了余震，但触发机制仍存在争议。触发研究一再表明，余震优先发生在由于永久断层错动而导致应力集中的断裂带。这是令人惊讶的，因为这些应力变化可能非常小，比震源上的应力变化小几个数量级。最近的研究结果表明，通过地震波产生的更大的瞬时应力变化也是一种可行的触发模型。为了确定哪些模型是最好的，我将对每个模型应用类似的统计方法，并将它们应用于相同的数据，以尽可能公平地比较它们。出于这个目的，我将研究1992年兰德斯地震序列和1999年赫克托矿山地震序列中的静态和动态应力转移。我将使用一组统一的统计检验来评估应力变化与余震分布的相关性，以便识别最一致的模型，并量化模型误差的影响。除了比较静态和动态触发模型外，我还将探索包括震后过程应力的模型，并查看背景应力状态的反演在两个序列之间是否一致。

Abstract for proposal EAR0003505 (PH # 12x)Title: Evaluating Static and Dynamic Stress Transfer TriggeringPI's: S. Gross, University of ColoradoThe goal of this research is to study the triggering of earthquakes, especially aftershocks. The clear association of aftershocks with their mainshocks suggests that mainshocks trigger their aftershocks, but the mechanisms of that triggering are still debated. Triggering studies have repeatedly shown that aftershocks occur preferentially in fault zones upon which stresses have been concentrated as a result of permanent fault offset. This is surprising because these stress changes can be very small, orders of magnitude smaller than the stress change on an earthquake source. Recent results reveal that the much larger transient stress changes, generated by passing seismic waves, are also a viable triggering model. In order to decide which models are best, I will apply similar statistical measures to each model and apply them to the same data to compare them as fairly as possible. With this aim, I will study both static and dynamic stress transferred in both the 1992 Landers and 1999 Hector Mine earthquake sequences. I will evaluate the correlation of stress changes with aftershock distributions, using a unified battery of statistical tests so that the most consistent models may be identified and the influence of model errors quantified. In addition to comparing static and dynamic triggering models, I will explore models that include stresses due to postseismic processes, and see if inversions for the background stress state are consistent between the two sequences.