The 3-D seismic signature of plumes: wavefield effects and experiment optimization

羽流的 3D 地震特征：波场效应和实验优化

• 批准号: 5323096
• 负责人: Professor Dr. Heiner Igel
• 金额: --
• 依托单位: Sektion Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2001
• 资助国家: 德国
• 起止时间: 2000-12-31 至 2005-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5323096?language=en
• 关键词: seismic; signature; plumes; wavefield; effects

The detailed seismic imaging of large mantle plumes is one of the major milestones towards understanding mantle convection and the geochemical evolution of the mantle. So far seismic studies have revealed plume conduits of diameter 100 to 200 km. However, details of the 3-D structure of plumes are difficult to investigate using ray-theoretical methods, (quasi-)analytical solutions for simplified plume structures (e.g. cylinders) or long-period information (e.g. from surface waves) only. We propose to carry out an extensive study of the complete 3-D wave field of likely plume structures with the aim of (1) predicting frequency-dependent effects on amplitudes and waveforms of plume-like structures; (2) testing experimental configurations for teleseismic studies on their ability to map the deep plume structure, (3) optimizing experimental configurations for seismic refraction studies planned in the future and (4) develop processing methods to extract structural information from recorded data. The numerical simulations of the 3-D wave fields will be carried out using verified algorithms developed on high-performance computers with the ability to achieve high-frequency wavefields.

大地幔柱的精细地震成像是了解地幔对流和地幔地球化学演化的重要里程碑之一。到目前为止，地震研究已经揭示了直径为100至200公里的羽流管道。然而，羽流的三维结构的细节很难调查使用射线理论的方法，（准）分析解决方案简化羽流结构（如气缸）或长周期的信息（如从表面波）。我们建议对可能的羽流结构的完整三维波场进行广泛的研究，目的是（1）预测频率对羽流结构振幅和波形的影响;（2）测试用于微重力研究的实验配置，以确定其绘制深羽流结构的能力，（3）优化未来计划进行的地震折射研究的实验配置;（4）开发从记录数据中提取构造信息的处理方法。三维波场的数值模拟将使用在能够获得高频波场的高性能计算机上开发的经过验证的算法进行。