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Deep, dark and dynamic: Converted-wave seismology to explore the physical properties of Antarctic glacier ice

深邃、黑暗和动态：转换波地震学探索南极冰川冰的物理特性

基本信息

批准号：
2287637
负责人：
金额：
--
依托单位：
University of Leeds
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2019
资助国家：
英国
起止时间：
2019 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2287637
关键词：
Deep dark dynamic Converted wave

项目摘要

Quantitative seismic analysis holds the key to establishing the mechanical properties of glaciers - the very properties which are required to accurately parameterise predictive models of glacier dynamics.Global sea levels are predicted to rise by ~1 m over the next 100 years, but such estimates are uncertain. To improve model predictions, a comprehensive description of all aspects of the glacier system is required, motivating the development of novel survey techniques.Seismic surveys are a powerful means of accessing the deep, dynamic underbelly of an ice mass. Hitherto, most seismic surveys considered only the P-wave component of the wavefield, and converted-wave seismology has been largely overlooked. Converted-waves could, however, offer an untapped resource of interpretative insight. This project explores the scope of converted-wave seismology to quantify fundamental glaciological properties - potentially spanning basal hydrology, ice temperature and flow fabrics. Test data will be acquired during the project on Norway's Hardangerjokulen ice cap with existing datasets provided, by the British Antarctic Survey and the Thwaites Glacier TIME project, at two priority Antarctic sites.The successful development of converted-wave methodologies will broaden the glaciological seismic toolbox, providing novel insight at sites of international research interest.

定量地震分析是确定冰川力学性质的关键--这些性质是冰川动力学预测模型精确参数化所必需的。据预测，全球海平面在未来100年内将上升约1米，但这种估计是不确定的。为了改进模型预测，需要对冰川系统的各个方面进行全面的描述，从而推动了新的调查技术的发展。地震调查是进入冰层深层动态腹部的有力手段。目前，大多数地震勘探只考虑波场的P波分量，而转换波地震学在很大程度上被忽视了。然而，转换波可以提供一种尚未开发的解释性洞察力资源。该项目探讨了转换波地震学的范围，以量化基本的冰川学特性-可能跨越基础水文，冰温和流动结构。将在挪威哈勒约库伦冰盖项目期间利用英国南极调查局和思韦茨冰川时间项目提供的现有数据集在南极两个优先地点获得测试数据，成功开发转换波方法将扩大冰川学地震工具箱，为国际研究兴趣地点提供新的见解。