Seismotectonics of the Lesser Antilles Arc

小安的列斯群岛弧的地震构造

• 批准号: 2892607
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2892607
• 关键词: Seismotectonics; Lesser; Antilles; Arc

Background: Subduction zones are the sites of the world's largest earthquakes, sometimes generating devastating tsunamis. The earthquake potential of the Lesser Antilles Arc (LAA) is poorly known, largely because of the challenge of obtaining data along this arc of small islands. Two historic earthquakes are thought to have been classical subduction thrust events, possibly with tsunamigenic potential. However, the extent of megathrust seismic coupling remains debated. The potential risk to large, poorly-protected communities in the Caribbean region is large.Rationale: In a recent large consortium grant, VoiLA, we collected new seismic data, including seabed-installed instruments, in and around the LAA. Data from our experiment has been used to image the subduction zone in unprecedented detail. We have compiled a preliminary catalogue of earthquakes detected during our deployment and developed a new moment tensor method to characterise faulting styles. We have been able to track how regions of more extensively hydrated incoming plate correlate with concentrations of small earthquakes and enhanced volcanic productivity along the arc. The next stage is to undertake an in-depth analysis of the VoiLA data to improve understanding of earthquake potential of the LAA.This project: In this PhD project the VoiLA seismic data will be used together with thermal and mechanical odels of the subduction zone to improve the understanding of the seismic potential and tectonics of the LAA. Machine learning techniques will be used to identify and locate as many events as possible, to characterise the spatial distribution, size-frequency characteristics and where possible styles of events. These results will be combined with existing earthquake catalogues, and then compared with predictions of the thermal structure and subducting plate stresses from models that are tailored based on our detailed imaging of the subduction zone. Given the LAA is an important end-member, where slow-convergence of The student would join the Imperial Plates, Mantle and Core group working on shallow and deep geophysical imaging, surface processes and mantle dynamics.

背景：俯冲带是世界上最大的地震的地点，有时会引起毁灭性海啸。较小的安特列斯弧（LAA）的地震潜力鲜为人知，这很大程度上是由于沿着小岛的弧线获得数据的挑战。人们认为两次历史性地震是经典的俯冲推力事件，可能具有海啸潜力。但是，超级震荡地震耦合的程度仍在争论中。加勒比海地区大型，受保护不良的社区的潜在风险很大。天赋：在最近的大型财团赠款中，我们收集了新的地震数据，包括LAA及其周围的海床上装置的工具。我们实验的数据已用于以前所未有的细节来对俯冲区进行映像。我们已经编制了在部署期间检测到的地震的初步目录，并开发了一种新的矩量方法来表征断层样式。我们已经能够跟踪更广泛水合板块的区域如何与沿弧沿弧的小地震浓度和增强的火山生产力相关联。下一阶段是对VOILA数据进行深入分析，以提高对LAA地震潜力的理解。该项目：在这个博士学位项目中，Voila地震数据将与俯冲区的热和机械ODEL一起使用，以提高对LAA的地震潜力和构件的理解。机器学习技术将用于识别和定位尽可能多的事件，以表征空间分布，尺寸频率特征和可能的事件样式。这些结果将与现有的地震目录相结合，然后与基于俯冲区的详细成像量身定制的模型的热结构和俯冲板应力进行了比较。鉴于LAA是一个重要的结束成员，学生将加入帝国板，地幔和核心组，从事浅层和深层地球物理成像，表面过程和地幔动态。