Kirchoff Coda Migration of Regional Network Data

9417493本研究旨在研究以复杂地面运动为主的地震高频记录的早期部分，包括直接体波相位的尾波。尾波中的能量来自许多来源，包括：震源区非均质性、地幔多路径和局部场地响应，后者是强烈地面运动的重要贡献者，因此是地震危险性的重要贡献因素。最近的工作引起了人们对地形和断裂带非均质性-通常是10‘S公里外-在为大的地方地震产生能量尾波方面所起的作用的关注。来自多个地震仪台网的数据将使用基尔霍夫偏移的一种变体进行分析。一旦确定了高散射潜力的特定地点，就可以通过短期部署便携式地震仪来进一步检查它们对地震危险的贡献。这项研究是国家减少地震灾害计划的一部分。***

9417493 Revenaugh This research is to study the early portion of seismic high frequency records dominated by complicated ground motions comprising the coda of the direct body wave phases. Energy within the coda derives from many sources, including: source region heterogeneity, mantle multipathing, and local site response, the latter being an important contributor to strong ground motion and, hence, to seismic hazard. Recent work has drawn attention to the role of scattering from topography and fault zone heterogeneity - often 10's of kilometers away - in producing energetic coda arrivals for large, local earthquakes. Data from a number of seismograph networks will be analyzed using a variant of Kirchoff migration. Once specific sites of high scattering potential have been identified, their contribution to seismic hazard can be further examined with short-term deployments of portable seismographs. This research is a component of the National Earthquake Hazard Reduction Program. ***