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Seismic anisotropy and discontinuities of the lithosphere-asthenosphere system beneath La Réunion and the southern Mascarene Plateau

留尼汪岛和马斯克林高原南部岩石圈-软流圈系统的地震各向异性和不连续性

基本信息

批准号：
247997214
负责人：
Professor Dr. Georg Rümpker
金额：
--
依托单位：
Arbeitsgruppe Seismologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/247997214?language=en
关键词：
Seismic anisotropy discontinuities lithosphere asthenosphere

项目摘要

The overarching goal of the German-French experiment RHUM-RUM is to seismologically image a mantle plume – or its absence – under the hotspot of La Réunion, and to understand the results in terms of convective flow at all depth levels of the Earth’s mantle. The majority of the data will become available in late 2013, at which time data analyses of various kinds will start, directed by the additional RHUM-RUM project partners.The two main objectives of the current proposal involve detailed seismological studies of the lithosphere-asthenosphere system and its possible interaction with and modification by the proposed mantle plume beneath La Réunion using the complete network of RHUM-RUM (OBS and island) stations:• An investigation of seismic anisotropy in relation to plume-induced mantle flow using shear-wave-splitting analyses.• The mapping of upper-mantle discontinuities with a focus on the determination of crustal and lithospheric thickness variations using P and S receiver-function methods.Additional topics covered by this proposal include studies of local and regional intra-plate seismicity and the detection and analysis of plume-scattered seismic signals by RHUM-RUM land stations in Mauritius.Of further relevance are recent findings based on zircon dating and gravity data which may suggest that the island of Mauritius and parts of the Southern Mascarene Plateau overlie fragments of continental lithosphere, a microcontinent called Mauritia. Crustal thickness estimates using receiver functions from stations of the RHUM-RUM network, including 11 seismic land stations in Mauritius, as proposed here, are uniquely suited to shed light on the current controversial debate on the existence of Mauritia.

德国和法国的实验rham - rum的首要目标是在La r<s:1>热点下对地幔柱（或其不存在）进行地震成像，并根据地幔所有深度的对流流动来理解结果。大部分数据将在2013年底获得，届时将开始由其他rham - rum项目合作伙伴指导的各种数据分析。当前建议的两个主要目标涉及使用完整的rham - rum （OBS和岛屿）台站网络对岩石圈-软流圈系统及其与La r<s:1>之下拟议的地幔柱可能的相互作用和改变进行详细的地震学研究：•使用剪切波分裂分析调查与羽流诱发的地幔流有关的地震各向异性。•利用P和S接收函数方法绘制上地幔不连续面，重点是确定地壳和岩石圈厚度变化。本提案所涉及的其他专题包括研究当地和区域板块内地震活动，以及毛里求斯的rum - rum地面台站对羽散地震信号的探测和分析。根据锆石年代测定和重力数据得出的最新发现可能表明，毛里求斯岛和南马斯卡林高原的部分地区位于大陆岩石圈的碎片之上，这是一个名为毛里求斯的微大陆。本文所提出的利用包括毛里求斯11个陆地地震台站在内的rham - rum台站的接收函数估算地壳厚度，特别适合于阐明当前关于毛里求斯存在的有争议的辩论。