Collaborative Research: Seismological Investigation of the Cameroon Volcanic Line - A Hot Line in the Mantle?

合作研究：喀麦隆火山线的地震学调查——地幔中的热线？

• 批准号: 0310094
• 负责人: Andrew Nyblade
• 金额: --
• 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: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0310094&HistoricalAwards=false
• 关键词: Collaborative; Research; Seismological; Investigation; Cameroon

The investigators propose to evaluate models for the origin of volcanic lines without age progression by examining the seismic structure of the crust and upper mantle beneath the Cameroon Volcanic Line (CVL). Volcanic lines without age progression cannot be explained by the conventional plume model. One family of models proposes that hot lines can be explained by added complexities within the plume framework, although alternatively lithospheric tensional cracks or small scale convection may explain volcanic lines without age progression. The CVL provides an excellent opportunity to investigate the crust and upper mantle seismic structure of a hot line and provide constraints on the underlying processes generating this feature. To image the seismic structure of the crust and upper mantle beneath the CVL, the PIs will carry out a 21-month passive broadband seismic experiment in Cameroon, using first 8 and then 30 stations. The seismic data will be analyzed by the techniques of body and surface waves tomography, receiver functions, and shear-wave splitting.

研究人员建议通过检查喀麦隆火山线（CVL）下方的地壳和上地幔的地震结构来评估没有年龄进展的火山线起源模型。 没有年龄进展的火山线无法用传统的羽流模型来解释。 一系列模型提出，热线可以通过羽流框架内增加的复杂性来解释，尽管岩石圈张力裂缝或小规模对流也可以解释没有年龄进展的火山线。 CVL 提供了一个极好的机会来研究热线的地壳和上地幔地震结构，并为产生该特征的底层过程提供约束。 为了对 CVL 下方的地壳和上地幔的地震结构进行成像，PI 将在喀麦隆开展为期 21 个月的被动宽带地震实验，首先使用 8 个台站，然后使用 30 个台站。 地震数据将通过体波和表面波层析成像、接收器函数和剪切波分裂技术进行分析。