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首页> 外文学位 >SIMULTANEOUS INVERSION OF THE THREE-DIMENSIONAL VELOCITY STRUCTURE AND MICROEARTHQUAKE HYPOCENTERS IN THE COSO GEOTHERMAL AREA AND THE GEYSERS - CLEAR LAKE GEOTHERMAL AREA, CALIFORNIA.
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SIMULTANEOUS INVERSION OF THE THREE-DIMENSIONAL VELOCITY STRUCTURE AND MICROEARTHQUAKE HYPOCENTERS IN THE COSO GEOTHERMAL AREA AND THE GEYSERS - CLEAR LAKE GEOTHERMAL AREA, CALIFORNIA.

机译：COSO地热区和间歇泉的三维速度结构和微地震震中同时反演-加利福尼亚州的清水湖地热区。

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摘要

This dissertation simultaneously treats the inversion of microearthquake arrival-time data to infer three-dimensional velocity structure and microearthquake hypocenters. It is divided into two main parts. The first part presents a numerical inversion scheme which is adapted from nonlinear inversion techniques. The second part presents the application of the method to the investigation of the layer velocity model and three-dimensional velocity structure of two geothermal areas. The arrival times of the P-phase and the S-phase are used in these inversions.; Earthquake hypocenters are structurally constrained. Therefore, the determination of the crustal velocity structure using earthquake sources of unknown focal depth, distributed irregularly over a tectonic area, is frequently unstable or converges poorly during the inversion of the shallow crustal structure. A partitioned-constraint algorithm which differs from the conventional Baysian type approach is adopted to limit the perturbation of the model parameter during each iteration of the calculation. The advantage of this constraint is the use of contextual information at each step to reduce local ambiguities and to simultaneously predict the model parameters. The low-velocity layer is also successfully recovered in the synthetic inversion study.; Among the different joint inversions carried out in this study are (1) the simultaneous inversion of the P-wave and S-wave arrival-time data to infer the velocity model and hypocenters, (2) the joint inversion of arrival-time data for several different initial velocity models and hypocenters, and (3) the joint inversion of arrival-time data for different initial velocity models and a single hypocenter models. An alternative approach to the inversion, which solves for the slowness instead of the velocity, is adopted since the perturbation of the slowness can be more easily constrained than perturbations of velocity. The three-dimensional inversion uses the average velocity model obtained from the layer-velocity inversion as an initial model.; In the application, this method is used to study the velocity structure of two geothermal areas: (1) The Geysers-Clear Lake geothermal area in northern California and (2) the Coso Hot Springs geothermal area in southeastern California. The procedure developed and carried out here is (1) inversion of the S-wave and P-wave arrival-time data for a layered velocity model using homogeneous station corrections, (2) simultaneous inversion of the same data for both a heterogeneous three-dimensional velocity structure for P- and S-waves and the hypocenters of all events using homogeneous station corrections, and (3) calculation of lateral variation of Poisson's ratio within layers.
机译：本文同时处理了微地震到达时间数据的反演，以推断三维速度结构和微地震震源。它分为两个主要部分。第一部分介绍了一种基于非线性反演技术的数值反演方案。第二部分介绍了该方法在研究两个地热区域的层速度模型和三维速度结构方面的应用。在这些反演中使用P相和S相的到达时间。地震震源在结构上受到限制。因此，在浅地壳结构反演过程中，使用未知震源深度，构造区域不规则分布的地震源确定地壳速度结构通常不稳定或收敛性差。采用不同于常规贝叶斯方法的分区约束算法来限制模型参数在每次计算迭代中的扰动。该约束的优点是在每个步骤中使用上下文信息来减少局部歧义并同时预测模型参数。在合成反演研究中，低速层也已成功恢复。在这项研究中进行的不同联合反演中，（1）同时对P波和S波到达时间数据进行反演以推断速度模型和震源；（2）对波到达时间数据进行联合反演。几个不同的初始速度模型和震源，以及（3）不同初始速度模型和单个震源模型的到达时间数据的联合反演。由于可以比速度的扰动更容易地约束慢度的扰动，因此采用了一种替代方法，它解决了速度而不是速度的问题。三维反演使用从层速度反演获得的平均速度模型作为初始模型。在本申请中，该方法用于研究两个地热区域的速度结构：（1）加利福尼亚北部的Geysers-Clear Lake地热区域和（2）加利福尼亚东南的Coso温泉地热区域。此处开发和执行的程序是（1）使用均质站校正对分层速度模型的S波和P波到达时间数据进行反演；（2）对异构三波模型同时进行相同数据的反演P波和S波的三维速度结构以及所有事件的震源，使用均一的站台校正，以及（3）计算层内泊松比的横向变化。

著录项

  • 作者

    LIN, TZEU-LIE.;

  • 作者单位

    The University of Texas at Dallas.;

  • 授予单位 The University of Texas at Dallas.;
  • 学科 Geophysics.
  • 学位 Ph.D.
  • 年度 1982
  • 页码 482 p.
  • 总页数 482
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;
  • 关键词

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