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

宽带短周期波形叠加地震矩释放的形状和持续时间及其与深度和构造形态的关系

• 批准号: 9805008
• 负责人: Heidi Houston
• 金额: $ 10.65万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-15 至 2001-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9805008&HistoricalAwards=false
• 关键词: Shape; Duration; Earthquake; Moment; Release

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.***

9805008 houston本研究涉及分析中至大地震的宽带和短周期震源特征，并研究震源性质随深度、大小、震源机制和构造制度（如板块热参数）的变化。首先，目前的工作将继续对国家地震台网和短周期区域阵列记录的深震宽带和短周期P波进行叠加，以获得时间函数。其次，这种方法将扩展到具有力矩和深度的中到大浅层地震的子集，使得破裂在模糊深度相位（即地震上方地球表面的反射）到来之前终止。目标是比较30至650公里深度地震的时间历史，并对浅层破裂终止进行系统表征，这一过程隐藏在最常研究的大型浅层地震的深度阶段中。这组时间函数还将表征从浅层到深层断裂的过渡，这表明余震生产力随深度增加而下降，并有助于约束深层地震断裂的机制。***