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

9725536这项研究涉及在现有地质和地震调查的基础上，在前瞻意义上建立加利福尼亚州帝国谷的三维地震速度模型。以前对帝国谷速度结构的反演虽然使用了大量的数据集，但由于在很短的尺度上地震速度变化很大，例如盆地周围的结晶岩和盆地内的浅层沉积物之间的地震速度变化很大，在浅层的反演分辨率很低，并且在反演过程中没有考虑到模型误差，因此很难进行反演。通过将地质信息集成到正演模型中，可以估计模型的不确定性，并在反演过程中适当地考虑这些不确定性。应该会产生一种改进的断层和地壳结构模型。这项研究是国家减少地震灾害计划的一部分。***

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. ***