Multi-scale seismic imaging of the crust and mantle beneath Iceland

冰岛下方地壳和地幔的多尺度地震成像

• 批准号: 2885515
• 金额: --
• 依托单位: University of Cambridge
• 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-2885515
• 关键词: Multi; scale; seismic; imaging; crust

This project will image (in 3D) the crust and upper mantle beneath Iceland using multi-scale seismic imaging. Theconfluence of the Mid-Atlantic Ridge and a deep sourced mantle plume has given rise to enhanced melting that hasformed Iceland, generating large volcanic fields, producing thicker than normal oceanic crust. Ergo, this research will playa crucial role in answering key questions on how the interaction between the ridge and plume leads to the growth ofrelatively thick crust, with a focus on trying to link processes that take place in the asthenosphere, mantle lithosphere andcrust, through the joint exploitation of local earthquake, regional and teleseismic sources. During the project, broadbandseismometers will be deployed and maintained, specifically the Reykjanes Peninsula and Northern Volcanic Zone. Datawill be added to the catalogue of data collected by the Cambridge Volcano Seismology Group. The Fast-MarchingTomography software package will be utilised (and potentially further developed) to produce a seismic model of the crustand upper mantle through multiple data types, including body wave traveltimes and surface wave dispersion. Multipleseismic data types will improve the ability to image the crust and upper mantle and provide higher resolution in regionswith dense data coverage. The resultant models will be compared with results from other geophysical and geochemicalmethods (such as gravity, heat flow trace element and isotope ratio analysis).

该项目将使用多尺度地震成像对冰岛下方的地壳和上地幔进行 3D 成像。大西洋中脊和深部地幔柱的交汇导致了冰岛的加速融化，形成了巨大的火山田，产生了比正常海洋地壳更厚的地壳。因此，这项研究将在回答有关洋脊和地幔柱之间的相互作用如何导致相对较厚的地壳生长的关键问题方面发挥至关重要的作用，重点是尝试将软流圈、地幔岩石圈和地壳中发生的过程联系起来，通过联合开发当地地震、区域和远震源。在该项目期间，将部署和维护宽带地震仪，特别是雷克雅内斯半岛和北部火山区。数据将添加到剑桥火山地震组收集的数据目录中。将利用快速行进断层扫描软件包（并可能进一步开发）通过多种数据类型（包括体波传播时间和表面波色散）生成地壳和上地幔的地震模型。多种地震数据类型将提高地壳和上地幔成像的能力，并在数据覆盖密集的区域提供更高分辨率。由此产生的模型将与其他地球物理和地球化学方法（例如重力、热流微量元素和同位素比分析）的结果进行比较。