Rift fault activity and interaction at high resolution using geophysical and drilling data analysis from Greece and East Africa

使用希腊和东非的地球物理和钻井数据分析高分辨率裂谷断层活动和相互作用

基本信息

批准号：
2284170
负责人：
金额：
--
依托单位：
University of Southampton
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2019
资助国家：
英国
起止时间：
2019 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2284170
关键词：
Rift fault activity interaction resolution

项目摘要

Active continental rifts and the faults that control their deformation are the source of earthquakes and create some of our most important sediment sinks. Corinth (Greece) and East Africa (e.g., Tanganyika) are two of the most active, rapdily extending continental rift zones on Earth, globally recognised for their significance in the initiation of the process of new ocean basin formation1,2. This project will integrate marine seismic and earthquake data, with new ocean drilling core and log data sampling rift sediments (Corinth rift: ocean drilling completed 20172) and field and earthquake data to study how faults grow, overlap and interact in active rift systems3. It is rare to be able to study how individual faults interact at the temporal and spatial scale relevant to a few earthquake cycles in an active and high-rate tectonic system, but these new combined datasets of fault displacement history, age and slip rate will provide a very high resolution record of fault activity. Fault control on sediment accumulation and fault development and activity are important for hydrocarbon systems. Active rift zones also generate damaging earthquakes and, in some cases, tsunamis: therefore fault slip change through time and fault interaction are important for hazard analysis.

活跃的大陆裂谷和控制其变形的断层是地震的根源，并形成了一些最重要的沉积物汇。科林斯（希腊）和东非（例如坦噶尼喀）是地球上两个最活跃、扩张最迅速的大陆裂谷带，因其在新洋盆形成过程启动过程中的重要性而得到全球公认1,2。该项目将整合海洋地震和地震数据，以及新的海洋钻探岩心和裂谷沉积物采样测井数据（科林斯裂谷：海洋钻探于 20172 年完成）以及现场和地震数据，以研究断层如何在活动裂谷系统中生长、重叠和相互作用3。很少能够研究单个断层如何在与活跃的高频率构造系统中的几个地震周期相关的时间和空间尺度上相互作用，但这些新的断层位移历史、年龄和滑移率的组合数据集将提供故障活动的高分辨率记录。断层对沉积物堆积的控制以及断层的发育和活动对于油气系统非常重要。活跃裂谷带还会产生破坏性地震，在某些情况下还会引发海啸：因此，断层滑移随时间的变化和断层相互作用对于灾害分析非常重要。