Inversion and Analysis of Earthquake Travel Time Data with A Priori Constraints in the Imperial Valley, California

这项研究是在现有的地质和地震调查的基础上，在正向意义上构建加利福尼亚州帝王谷的三维地震速度模型。以往帝王谷的速度结构反演虽然使用了大量的数据集，但由于短长度尺度（例如盆地周围的结晶岩与盆地内的浅层沉积物之间）的地震速度变化很大，浅深度反演的分辨率较差，以及反演过程中缺乏对模型误差的考虑，因此很难进行反演。将地质信息整合到正演模型中，可以估计模型的不确定性，并在反演时适当考虑这些不确定性。由此可以得到一个改进的断层和地壳结构模型。这项研究是国家减少地震危害计划的一个组成部分。＊＊＊

9725536 Magistrale This research involves the construction, in a forward sense, of a 3- D seismic velocity model of the Imperial Valley, California, based on existing geologic and seismic surveys. Previous inversions for the velocity structure of the Imperial Valley, although done with extensive data sets, were difficult due to the large seismic velocity variations over short length scales, for example between crystalline rocks surrounding the basin and shallow sediments within the basin, the poor resolution of inversion at shallow depths, and the lack of accounting of model errors during the inversion. With the geologic information integrated in a forward model, it will be possible to estimate the model uncertainties, and properly account for those uncertainties during inversion. An improved model of faulting and crustal structure should result. This research is a component of the National Earthquake Hazard Reduction Program. ***