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

该项目将利用多尺度地震成像技术对冰岛地下地壳和上地幔进行三维成像。中大西洋洋脊和深源地幔柱的交汇处加速了融化，形成了冰岛，产生了大型火山场，产生了比正常海洋地壳更厚的地壳。因此，这项研究将在回答山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上发挥关键作用，重点是通过联合利用本地地震、区域地震和远震震源，试图将软流圈、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，特别是在雷克雅内斯半岛和北部火山带。数据将被添加到剑桥火山地震学小组收集的数据目录中。Fast-MarchingTomography软件包将利用（并有可能进一步开发）通过多种数据类型（包括体波传播时间和面波频散）生成地壳上地幔的地震模型。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。所得模型将与其他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分析）的结果进行比较。

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).