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技术对冰岛地壳和上地幔进行三维成像。中大西洋海岭和深源地幔柱的汇合导致了增强的熔融，形成了冰岛，产生了大型火山区，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，重点是试图通过联合开发当地地震，区域和地幔震源，将软流圈，地幔岩石圈和地壳中发生的过程联系起来。在项目期间，将部署和维护宽带地震仪，特别是雷克雅内斯半岛和北方火山区。数据将被添加到剑桥火山地震组收集的数据目录中。将利用（并可能进一步开发）快速行进层析成像软件包，通过多种数据类型，包括体波走时和表面波频散，制作地壳和上地幔的地震模型。多种地震数据类型将提高对地壳和上地幔成像的能力，并在数据覆盖密集的地区提供更高的分辨率。将所得模型与其它地球物理和地球化学方法（如重力、热流微量元素和同位素比值分析）的结果进行比较。