权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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-法国实验RHUM-RUM的首要目标是对留尼汪岛热点下的地幔柱（或其缺失）进行地震成像，并了解地球地幔所有深度水平对流的结果。大部分数据将在2013年晚些时候提供，届时将开始进行各种数据分析，目前建议的两个主要目标是利用RHUM-RUM的完整网络，对岩石圈-软流圈系统及其可能与留尼旺岛下地幔柱的相互作用和修改进行详细的地震学研究（OBS和岛屿）台站：·使用剪切波分裂分析研究与地幔柱诱发地幔流有关的地震各向异性。上地幔不连续面的测绘，重点是利用P和S接收函数方法确定地壳和岩石圈厚度变化。该提案涵盖的其他主题包括研究局部和区域板内地震活动性以及RHUM探测和分析地幔柱散射地震信号。最近根据锆石测年和重力数据得出的结论可能表明，毛里求斯岛和南马斯卡林高原的部分地区大陆岩石圈的碎片，一个叫做“克拉通”的微大陆。利用RHUM-RUM网络台站的接收器功能估算地壳厚度，包括此处提议的毛里求斯11个陆地地震台站，特别适合于阐明目前关于是否存在地壳的有争议的辩论。