Refining Upper Mantle Models Beneath the Western United States

完善美国西部地区的上地幔模型

• 批准号: 0639507
• 负责人: Donald Helmberger
• 金额: $ 22.32万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-03-01 至 2012-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0639507&HistoricalAwards=false
• 关键词: Refining; Upper; Mantle; Models; Beneath

There have been major advances in synthetic computational techniques and USArray will provide unprecedented amounts of data for analysis. As demonstrated in this proposal, several recent 3D surface wave tomographic models predict synthetics matching array data at periods greater than about 20s. These models augmented by enhanced bodywave tomographic images will be used to constrain the modeling of triplication data. Converted phases, i.e., Ps, etc., will be generated synthetically to verify these 3D models. We will investigate efficient routines for the modeling of the seismic data using 1D, 2D, and 3D codes and apply our techniques to older GSN, LRSM, and WWSSN data along with modern data (PASSCAL, CISN, Baja Array, etc.). Spectral-element (SEM) and Green's functions 2D finite-difference generated from this 3D model will allow more precise information about earthquakes to be determined (Historic and Future) and the extension of our local automated real-time source estimation system to cover events throughout the Western United States (M3.5). Directivity estimates for significant events can be obtained from site-corrected stations and artificial Shake-map simulations generated to assist emergency services and field operations. Our broadband Green's functions will be provided to the community (within hours) along with movies showing radiated seismic waves and interactive software. These efforts will assist our own students and others in examining broadband seismograms with a clear view of what is source and what is structure.

合成计算技术已经取得了重大进展，USAray将提供前所未有的大量数据进行分析。如本提案所示，最近的几个3D表面波层析模型预测合成匹配阵列数据的周期大于约20秒。这些模型增强增强体波断层图像将被用来约束三倍数据的建模。转换相位，即，Ps等将合成生成以验证这些3D模型。我们将研究使用1D，2D和3D代码对地震数据进行建模的有效例程，并将我们的技术应用于旧的GSN，LRSM和WWSSN数据沿着现代数据（PASSCAL，CISN，Baja Array等）。谱元（SEM）和绿色的功能，从这个三维模型产生的二维有限差分将允许更精确的信息，地震被确定（历史和未来）和我们的本地自动实时源估计系统的扩展，以涵盖整个美国西部（M3.5）的事件。重大事件的方向性估计可以从现场校正站和人工地震图模拟中获得，以协助应急服务和现场操作。我们的宽带绿色的功能将提供给社区（在几个小时内）沿着电影显示辐射地震波和互动软件。这些努力将有助于我们自己的学生和其他人在检查宽带地震图，清楚地了解什么是源，什么是结构。