Nonlinear Velocity Inversion for Subsurface Imaging of Southern California Faults

这项研究将开发一种非线性速度反演技术，该技术可以解释通过横向不连续的弯曲地震射线路径。以前的项目对南加州的活动断层进行了地震成像，从而描述了Garlock和Hosgri断层的非垂直倾角。然而，由于缺乏对周围横向速度变化的了解，阻碍了这些衍射向真实深度剖面的迁移，本研究将解决这一问题。在南加州穿越地震断层的调查数据迁移之前应用这种反演将有助于解决区域地震危险性的模糊性。这项研究是国家减少地震危害计划的一个组成部分。

This research will develop a nonlinear velocity inversion technique that accounts for curved seismic ray paths through lateral discontinuities. Seismic imaging of active fault traces in southern California carried out by previous projects has led to the description of non-vertical dips for the Garlock and Hosgri faults. However, migration of these diffractions into a true depth section is impeded by lack of knowledge of the surrounding lateral velocity variations, which this research will address. Application of this inversion prior to the migration of survey data crossing earthquake faults in southern California will help to resolve ambiguities in regional seismic hazard. This research is a component of the National Earthquake Hazard Reduction Program.