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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和人口最多的火山岛。该岛位于特塞拉裂谷东南部，是欧亚大陆板块边界热点之一。然而，对特塞拉裂谷圣米格尔段的构造演化知之甚少，也不了解附带的地质灾害。基于对2009年使用RV Meteor进行的密集多参数地球物理调查的初步解释，我们打算测试以下假设：1。圣米格尔附近的S形盆地系统代表了一个火山活动的渗漏转换断层，它连接了裂谷的两个伸展段。2.地质风险来自地幔底辟（热点）和板块构造、地震、深成岩和火山活动等级联地球动力学过程，而不是质量浪费、海啸生成和有毒气体逃逸。我们的项目力求通过对特塞拉裂谷东南部的三维结构进行成像，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各种数据来源（广角反射/折射地震数据、重力、磁力、多道地震、多波束和参数沉积物回声测深）联合收割机结合起来，绘制所产生的结构图。将采用“自下而上”的方法重建作用过程，从壳幔边界分析开始，到海底形态结构分析结束。