Three-Dimensional Wave Propagation Effects in Teleseismic Body Waves

远震体波中的三维波传播效应

• 批准号: 9304232
• 负责人: Charles Langston
• 金额: $ 11.83万
• 依托单位: Pennsylvania State Univ University Park
• 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: 1993-07-01 至 1995-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9304232&HistoricalAwards=false
• 关键词: Three; Dimensional; Wave; Propagation; Effects

This research is to investigate and model anomalous particle motions and coda of seismic body waves received at broad-band TERRAscope stations in the active seismic region of southern California. These effects are believed to be due to lateral heterogeneity, including faults, near the stations. Understanding the effects of lateral velocity heterogeneity is essential for evaluating errors in waveform modeling using simple 1-D earth models and determining wave scattering mechanisms within the lithosphere. The anomalous observations themselves may be useful in inferring constraints on the type and magnitude of heterogeneity. Data from all available TERRAscope stations will be investigated for inference of lateral heterogeneity. In addition to velocity heterogeneity due to geologic structure, effects of topography will be investigated to determine if topography plays a major role in formation of P wave coda and the interpretation of the P waveform particle motions. This research is a component of the National Earthquake Hazard Reduction Program.

本研究的目的是研究和模拟反常粒子 宽频带地震体波运动和尾波 南部地震活跃区的地形观测站 加州。 这些影响被认为是由于横向 不均匀性，包括车站附近的断层。 理解 横向速度不均匀性的影响对于 用简单的一维地球估算波形模拟的误差 模型和确定波散射机制内的 岩石圈 异常观测本身可能是有用的 在推断限制的类型和规模 异质性 来自所有可用TERRAscope站的数据将 研究横向不均匀性的推断。 在 除了由于地质结构引起的速度不均匀性之外， 将研究地形的影响，以确定是否 地形在P波尾波的形成中起主要作用， P波粒子运动的解释。 本研究 是国家地震减灾计划的一部分。