Collaborative Research: Imaging Seismic Heterogeneity within the Antarctic Mantle with Full Waveform Ambient Noise Tomography

合作研究：利用全波形环境噪声断层扫描对南极地幔内的地震非均质性进行成像

• 批准号: 1643798
• 负责人: Erica Emry
• 金额: $ 19.67万
• 依托单位: New Mexico Institute of Mining and Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-03-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1643798&HistoricalAwards=false
• 关键词: Collaborative; Research; Imaging; Seismic; Heterogeneity

Nontechnical description of proposed research: This project will apply cutting-edge seismic imaging methods to existing seismic data to study the three-dimensional structure of the Earth beneath the ice-covered Antarctic continent. The study will improve understanding of Earth structure and hotspots and geologically recent and ancient rift systems. The results will be useful for models of ice movement and bedrock elevation changes due to variation in ice sheet thickness. The results will also help guide future seismic data collection. The researchers will transfer existing software from the high-performance computers at The University of Rhode Island to the Alabama supercomputer facilities. The project will also broaden public understanding of scientific research in Antarctica by engaging with the students and teachers in Socorro County, New Mexico to discuss career opportunities in science, technology, engineering, and mathematics (STEM), the Earth Sciences, and the importance of computers in scientific research. Project personnel from Alabama will visit Socorro and share research with students at New Mexico Tech and at the Socorro High School. The project will also train undergraduate and graduate students in the expanding field of computational seismology, by applying these approaches to study Antarctic geology.Technical description of proposed research: The project seeks to better resolve the three-dimensional Antarctic mantle structure and viscosity and to identify locations of ancient rifts within the stable East Antarctic lithosphere. To accomplish this, the researchers will utilize full-waveform tomographic inversion techniques that combine long-period ambient noise data with earthquake constraints to more accurately resolve structure than traditional tomographic approaches. The proposed research will be completed using the Alabama supercomputer facilities and the programs and methodology developed at The University of Rhode Island. The new tomographic results will be useful in assessing lithospheric structure beneath Dronning Maud Land as well as the Wilkes and Aurora Subglacial Basins in East Antarctica, where previous rifting episodes and mid-lithospheric discontinuities will be explored. In West Antarctica, the work will elucidate the easternmost extent of the West Antarctic Rift System as well as rifted structure and possible compositional variations within the Weddell Sea. The accuracy of existing Antarctic seismic models will be quantified through model validation approaches. The researchers will highlight regions of Antarctica where tomographic resolution is still lacking and where future deployments would improve resolution.

拟议研究的非技术描述：该项目将对现有的地震数据应用尖端的地震成像方法，以研究冰覆盖的南极大陆下地球的三维结构。 这项研究将提高对地球结构和热点以及地质新近和古老的裂谷系统的了解。 由于冰盖厚度的变化，结果对于冰运动和基岩高度变化的模型将很有用。 结果还将有助于指导未来的地震数据收集。 研究人员将将现有软件从罗德岛大学的高性能计算机转移到阿拉巴马州超级计算机设施。 该项目还将通过与新墨西哥州索科罗县的学生和教师互动，讨论科学，技术，工程和数学（STEM），地球科学以及计算机在科学研究中的重要性，从而扩大公众对南极科学研究的理解。 来自阿拉巴马州的项目人员将访问Socorro，并与新墨西哥理工学院和Socorro高中的学生分享研究。 该项目还将通过应用这些方法来研究南极地质学领域的扩展领域的本科和研究生。拟议研究的技术描述：该项目旨在更好地解决三维南极地幔结构和粘度和粘度和粘度，并在稳定的东方稳定地点识别东方稳定的位置。 为此，研究人员将利用与传统层析成像方法相比，将长期周围环境噪声数据与地震约束结合到更准确地解决结构的全波形层析成像技术。 拟议的研究将使用阿拉巴马州超级计算机设施以及罗德岛大学开发的计划和方法完成。 新的断层扫描结果将有助于评估南极洲东部的Maud土地下的岩石圈结构以及Wilkes和Aurora sub冰川盆地，在此之前，将探索先前的裂痕发作和中间层中的不连续性。 在南极西部，这项工作将阐明南极裂谷系统的最东端以及裂谷的结构以及韦德尔海内的可能的组成变化。现有南极地震模型的准确性将通过模型验证方法量化。研究人员将重点介绍南极层造影分辨率仍然缺乏以及未来部署将改善分辨率的地区。

项目成果

Prominent thermal anomalies in the mantle transition zone beneath the Transantarctic Mountains

横贯南极山脉下方地幔过渡带的显着热异常

• DOI: 10.1130/g47346.1
• 发表时间: 2020
• 期刊: Geology
• 影响因子: 5.8
• 作者: Emry, Erica L.;Nyblade, Andrew A.;Horton, Alan;Hansen, Samantha E.;Julià, Jordi;Aster, Richard C.;Huerta, Audrey D.;Winberry, J. Paul;Wiens, Douglas A.;Wilson, Terry J.
• 通讯作者: Wilson, Terry J.