Mapping of Lower Mantle Velocity Heterogenieties Beneath the Northern USSR

苏联北部下方下地幔速度异质性测绘

• 批准号: 9005513
• 负责人: J Davis
• 金额: $ 6.17万
• 依托单位: Teledyne Geotech
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-09-01 至 1993-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9005513&HistoricalAwards=false
• 关键词: Mapping; Lower; Mantle; Velocity; Heterogenieties

This research is to analyze existing digital seismic data sets for further evidence of a strong P-velocity anomaly in the lower mantle beneath the northern Soviet Union and, if possible, to map its spatial extent. Although considerable SH data show evidence of anomalous structure up to 350 km above the core- mantle boundary, to this date only European WWSSN data and the GRF array have been searched successfully to find the P-wave analog produced by such an anomaly. The results should give information on what kind of structure is giving rise to the anomalous observations which can, in turn, constrain dynamical models of the mantle and core.

这项研究是为了分析现有的数字地震数据集，以进一步证明苏联北部下地幔存在强烈的P-速度异常，如果可能的话，绘制其空间范围图。尽管大量的SH数据显示出核幔边界以上350公里处存在异常结构的证据，但到目前为止，只有欧洲的WWSSN数据和GRF阵列被成功地搜索到由这种异常产生的P波类似物。这些结果应该会给出导致异常观测的是哪种结构的信息，这反过来可能会约束地幔和地核的动力学模型。