Direct Inversion of Polarization Anomalies for the LaterallyHeterogeneous Velocity Structure of the Lithosphere

岩石圈横向非均质速度结构偏振异常的直接反演

• 批准号: 9104199
• 负责人: William Menke
• 金额: $ 5.5万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-08-15 至 1993-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9104199&HistoricalAwards=false
• 关键词: Direct; Inversion; Polarization; Anomalies; LaterallyHeterogeneous

This research is to utilize the polarization direction of short period P waves to investigate lateral heterogeneities in the lithosphere. Recent measurements of the polarization direction have shown that stable results can be obtained with a precision of about 5 degrees, and that these directions are sometimes systematically different from ray theoretical predictions based on a laterally homogeneous compressional velocity structure. Lateral heterogeneities mapped by means of the polarization direction anomalies have the potential to delineate velocity anomalies associated with active fault zones. This research is a component of the National Earthquake Hazard Reduction Program.

本研究是利用短脉冲的偏振方向 周期P波来研究中的横向不均匀性 岩石圈 最近对偏振方向的测量 已经表明，可以获得稳定的结果，精度为 大约5度，这些方向有时 系统地不同于射线理论的预测， 横向均匀的压缩速度结构。 横向 偏振方向非均匀性 异常具有描绘速度异常的潜力 与活动断层带有关。 这项研究是 国家地震减灾计划。