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

研究人员建议通过研究喀麦隆火山线(CVL)下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的模型。没有年龄递增的火山线不能用传统的烟柱模型来解释。一个模型家族提出，热线可以通过羽流框架内增加的复杂性来解释，尽管另一种选择是岩石圈张性裂缝或小规模对流可以解释没有年龄进展的火山线。CVL为研究热线的地壳和上地幔地震结构提供了极好的机会，并对产生这一特征的潜在过程提供了约束。为了成像CVL之下的地壳和上地幔的地震结构，PI将在喀麦隆进行为期21个月的被动宽带地震试验，首先使用8个台站，然后是30个台站。地震资料将通过体波和面波层析成像、接收函数和横波分裂技术进行分析。

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.