Seismic Wave Scattering in Heterogeneous Medium and its Application to Observations

非均质介质中的地震波散射及其在观测中的应用

• 批准号: 9305172
• 负责人: Yuehua Zeng
• 金额: $ 7.8万
• 依托单位: Board of Regents, NSHE, obo University of Nevada, Reno
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-09-01 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9305172&HistoricalAwards=false
• 关键词: Seismic; Wave; Scattering; Heterogeneous; Medium

9305172 Zeng This research continues successful theoretical developments supported under previous NSF funding on multiple seismic energy scattering. Here, the researcher will extend the numerical simulation of the multiply scattered wave in a non-uniform absorption and scattering medium, explore various factors affecting the observed seismic coda decay, study the effect of anisotropic scattering processes on the seismic scattering wave decay, incorporate a depth-dependent velocity structure, compare seismic scattering effects between realistic heterogeneous models, and apply the theoretical results to real data. The work will have important application to the estimation of the coda magnitude and site amplification, to the Q variation as a possible precursor to earthquake prediction, to the study of crustal heterogeneity and rheology structure and to the extension of the coda study to the early strong part of the earthquake shaking which progressively damages buildings. This research is a component of the National Earthquake Hazard Reduction Program. ***

小行星9305172 这项研究延续了先前NSF资助的多次地震能量散射的成功理论发展。 在这里，研究者将扩展非均匀吸收和散射介质中多次散射波的数值模拟，探索影响观测到的地震尾波衰减的各种因素，研究各向异性散射过程对地震散射波衰减的影响，结合深度相关的速度结构，比较现实非均匀模型之间的地震散射效果，并将理论结果应用于真实的数据。 这项工作将有重要的应用，以估计的尾波震级和现场放大，Q变化作为一个可能的前兆地震预报，地壳的非均匀性和流变结构的研究和尾波研究的扩展到早期强烈的地震震动，逐步破坏建筑物的一部分。 这项研究是国家地震减灾计划的一个组成部分。 ***