Collaborative Research: Mantle Structure and Dynamics of the Ross Sea from a Passive Seismic Deployment on the Ross Ice Shelf

合作研究：罗斯冰架上被动地震部署的罗斯海地幔结构和动力学

• 批准号: 1142518
• 负责人: Douglas Wiens
• 金额: $ 37.42万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1142518&HistoricalAwards=false
• 关键词: Collaborative; Research; Mantle; Structure; Dynamics

Intellectual Merit: The PIs propose to establish an ice shelf network of 18 broadband seismographs deployed for two years to obtain high-resolution, mantle-scale images of Earth structure underlying the Ross Sea Embayment. Prior marine geophysical work provides good crustal velocity models for the region seaward of the ice shelf but mantle structure is constrained by only low-resolution images due to the lack of prior seismic deployments. The proposed stations would be established between Ross Island and Marie Byrd Land. These stations would fill a major geological gap within this extensional continental province and would link data sets collected in the Transantarctic Mountain transition/Plateau region (TAMSEIS) and in West Antarctica (POLENET) to improve resolution of mantle features beneath Antarctica. The proposed deployment would allow the PIs to collect seismic data without the expense, logistical complexity, and iceberg hazards associated with ocean bottom seismograph deployments. Tomographic models developed from the proposed data will be used to choose between competing models for the dynamics of the Ross Sea. In particular, the PIs will investigate whether a broad region of hot mantle, including the Eastern Ross Sea, indicates distributed recent tectonic activity, which would call into question models proposing that Eastern Ross extension ceased during the Mesozoic. These data will also allow the PIs to investigate the deeper earth structure to evaluate the possible role of mantle plumes and/or small-scale convection in driving regional volcanism and tectonism across the region.Broader impacts: Data from this deployment will be of broad interdisciplinary use. This project will support three graduate and two undergraduate students. At least one student will be an underrepresented minority student. The PIs will interact with the media and include K-12 educators in their fieldwork.

知识分子的优点：PIS提议建立一个部署了两年的18个宽带地震仪的冰架网络，以获取罗斯海嵌入的高分辨率，地幔尺度图像。先前的海洋地球物理工作为冰架区域提供了良好的地壳速度模型，但由于缺乏先前的地震部署，地幔结构仅受低分辨率图像的限制。拟议的车站将在罗斯岛和玛丽·伯德土地之间建立。这些电台将填补这个延伸大陆省内的主要地质差距，并将在跨二行山过渡/高原地区（Tamseis）和南极西部（Polenet）收集的数据集链接，以改善南方毛皮下地幔特征的分辨率。拟议的部署将使PI收集地震数据，而无需支出，后勤复杂性和与海洋底部地震仪的部署相关的冰山危害。根据建议的数据开发的层析成像模型将用于在罗斯海动力学的竞争模型之间进行选择。特别是，PI将调查包括东部罗斯海在内的广泛的热地幔区域是否表示分布的近期构造活动，该活动将提出问题模型，提出在中生代期间东部罗斯延伸停止。这些数据还将允许PI调查更深的地球结构，以评估地幔羽和/或小规模对流在驱动整个地区的区域火山和构造中的可能作用。Boader的影响：这种部署的数据将具有广泛的跨学科使用。该项目将支持三名研究生和两名本科生。至少有一个学生将是代表人数不足的少数族裔学生。 PI将与媒体互动，并将K-12教育者包括在他们的野外工作中。