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

加利福尼亚州帝王谷地震走时数据先验约束反演与分析

• 批准号: 9725536
• 负责人: Harold Magistrale
• 金额: $ 10.49万
• 依托单位: San Diego State University Foundation
• 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: 1998-01-15 至 2000-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725536&HistoricalAwards=false
• 关键词: Inversion; Analysis; Earthquake; Travel; Time

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. ***

9725536 Magistrale 这项研究涉及基于现有的地质和地震调查，在前瞻性意义上构建加利福尼亚州因皮里尔谷的 3D 地震速度模型。 以前对帝王谷速度结构的反演虽然使用了广泛的数据集，但由于短长度尺度上的地震速度变化较大（例如盆地周围的结晶岩与盆地内的浅层沉积物之间）、浅层反演分辨率差以及反演过程中缺乏对模型误差的考虑，反演很困难。 通过将地质信息集成到正演模型中，将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。 应该会产生一个改进的断层和地壳结构模型。 这项研究是国家地震减灾计划的一部分。 ***