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Hotspot dominated rifting: Volcanic island evolution and collateral geo-hazards resulting from cascading geodynamic processes - The instance of Sao Miguel (south-eastern Terceira Rift, Azores)

热点主导的裂谷：火山岛演化和级联地球动力学过程造成的附带地质灾害 - 以圣米格尔岛为例（亚速尔群岛特塞拉裂谷东南部）

基本信息

批准号：
193862030
负责人：
Professor Dr. Christian Hübscher
金额：
--
依托单位：
Institut für Geophysik (IfG)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/193862030?language=en
关键词：
Hotspot dominated rifting Volcanic island

项目摘要

Sao Miguel is the biggest and most populated volcanic island of the Azores. The island is located on the south-eastern Terceira Rift, one of the plate-boundary hotspots of Eurasia. However, little is known about the structural evolution of the Sao Miguel section of the Terceira rift, nor about collateral geo-hazards. Based on a preliminary interpretation of an intense multi-parameter geophysical survey with RV Meteor in 2009 we intend to test, among others, the following hypotheses: 1. The sigmoidally shaped basin system in the vicinity of Sao Miguel represents a volcanically active leaky transform fault that links two extensional segments of rift. 2. Geo-risks result from cascading geodynamic processes like mantle diapirism (hotspot) and plate tectonics, earthquakes, plutonism and volcanism, than mass wasting, tsunami generation and escape of poisonous gas. Our project strives for a comprehensive understanding of the partly consecutive earth processes by imaging the three dimensional structure of the south-eastern Terceira Rift and and the mapping of resulting structures by being the first to combine under the same project a variety of data sources: wide-angle reflection / refraction seismic data, gravity, magnetics, multi-channel seismics, muti-beam and parametric sediment echosounding. The acting processes will be reconstructed by a “bottom-up” approach, starting with the analysis of the crust-mantle boundary and ending with the seafloor morphostructure.

圣米格尔是亚速尔群岛最大、人口最多的火山岛。该岛位于欧亚大陆板块边界热点之一的特塞拉裂谷东南部。然而，人们对特塞拉裂谷Sao Miguel段的构造演化以及附带的地质灾害知之甚少。根据对2009年RV Meteor密集的多参数地球物理调查的初步解释，我们打算检验以下假设，以及其他假设：1.Sao Miguel附近的Sigmoid型盆地系统代表一条火山活动的泄漏转换断层，连接两个伸展的裂谷段。2.地质风险是地幔底辟(热点)和板块构造、地震、深成岩和火山活动等层叠地球动力学过程的结果，而不是物质损耗、海啸和有毒气体逸出的结果。我们的项目通过对特雷塞拉裂谷东南部的三维结构进行成像，力求全面了解部分连续的地球过程，并通过在同一项目下首次将多种数据来源：广角反射/折射地震数据、重力、磁学、多道地震、多波束和参数沉积物测深结合在一起，绘制了由此产生的结构图。将以“自下而上”的方法重建作用过程，从分析壳-地幔边界开始，以海底地貌结构结束。