Mantle Fine Structure from Dense Regional Seismic Networks

9628051 Vidale这项研究涉及使用密集的短周期地震台网的地震记录，这些台网作为一个阵列进行分析，以描绘地幔结构的细节，特别是在核-地幔边界及其附近和上地幔的不连续面处。美国西部1000多个地震台记录的中南美洲50多次大地震的岩心反射和折射将被用来成像核幔边界附近的非均质性。在西海岸站记录的大约100次内华达州试验场核试验将被用来分析来自上地幔不连续顶部的反射。来自同一不连续面底部的P‘P’反射也将被用作上地幔性质急剧变化的敏感指标。对这些地幔不均匀和不连续性的研究将有助于我们了解地球对流，这是板块构造和地震的驱动力。这项研究是国家减少地震灾害计划的一部分。***

9628051 Vidale This research involves the use of earthquake recordings at dense short-period seismic networks that are analyzed as an array to delineate details of mantle structure, especially at and near the core-mantle boundary and at discontinuities in the upper mantle. Core reflections and refractions recorded at over 1000 seismic stations in the western U.S. from more than 50 large earthquakes in Central and South America will be used to image the heterogeneity near the core-mantle boundary. Approximately 100 Nevada Test Site nuclear tests recorded at west coast stations will be used to analyze reflections from the top of upper mantle discontinuities. P'P' reflections from the bottom of the same discontinuities will also be used as sensitive indicators of sharp changes in upper mantle properties. Study of these mantle heterogeneities and discontinuities will help us learn about the Earth's convection which is the driving force for plate tectonics and earthquakes. This research is a component of the National Earthquake Hazard Reduction Program. ***