Reflections Under the Scottish Highlands (RUSH II): A Broadband Investigation of the Extent and Origin of Upper Mantle Reflectors in Scotland

James H.克纳珀-0074002不列颠群岛西北部下的上地幔反射是地幔内精细尺度不均匀性的一些最著名和研究最多的例子。 首先观察到的BIRPS海洋深地震反射剖面，这些反射体随后被成像和相关的额外的反射和折射剖面在苏格兰北方和西部的近海地区，但没有被可靠地追踪到大陆之下，虽然现有的广角反射数据的分析表明，这些反射体确实项目在苏格兰大陆之下。 本研究将解决两个科学潜力的宽带成像的精细尺度上地幔结构以及构造意义的主要地幔反射下不列颠群岛。 该项目将支持在苏格兰部署一个为期两年的25个台站宽带地震网络，以执行以下任务。 1)将被动源和主动源记录上地幔反射层的地震特征联系起来。 2)确定苏格兰大陆下地幔反射层的区域范围。 3)研究上地幔反射层与古生代岩石圈尺度结构的几何关系。 4)估计这些反射层及其周围岩石圈地幔的物理性质，包括各向异性。 5)验证上地幔结构主要是新生代的假设。 这项工作将利用NSF的资金，以及英国NERC对布里斯托大学的现有支持，进行RUSH实验的第一阶段。

James H. KnappEAR-0074002Upper mantle reflections beneath the northwestern British Isles are some of the best-known and most-studied examples of fine-scale heterogeneity within the mantle. First observed on BIRPS marine deep seismic reflection profiles, these reflectors have subsequently been imaged and correlated on additional reflection and refraction profiles in the offshore area of northern and western Scotland, but have not been reliably traced beneath the mainland, although analysis of existing wide-angle reflection data suggest these reflectors do project beneath mainland Scotland. The present study will address both the scientific potential of broadband imaging of fine-scale upper mantle structure as well as the tectonic significance of major mantle reflectors beneath the British Isles. The project will support a 2-year deployment of a 25-station broadband seismic network in Scotland to perform the following tasks. 1) Correlate the seismic signature of upper mantle reflectors on passive- and active-source records. 2) Determine the regional extent of mantle reflectors beneath the Scottish mainland. 3) Examine the geometric relationship of upper mantle reflectors with lithosphere-scale structures of Paleozoic age. 4) Estimate the physical properties, including anisotropy, of these reflectors and their surrounding lithospheric mantle. 5) Test the hypothesis that upper mantle structure is largely Cenozoic in age. This effort will leverage NSF funds with existing support from the British NERC to the University of Bristol for phase I of the RUSH experiment.