Collaborative Research - Transantarctic Mountains Deformation Network: GPS Measurements of Neotectonic Motion in the Antarctic Interior

合作研究 - 横贯南极山脉变形网络：南极内陆新构造运动的 GPS 测量

• 批准号: 0230285
• 负责人: Terry Wilson
• 金额: --
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-15 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0230285&HistoricalAwards=false
• 关键词: Collaborative; Research; Transantarctic; Mountains; Deformation

OPP-0230285/OPP-0230356PIs: Wilson, Terry J./Hothem, Larry D.This award, provided by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, supports a project to conduct GPS measurements of bedrock crustal motions in an extended Transantarctic Mountains Deformation network (TAMDEF) to document neotectonic displacements due to tectonic deformation within the West Antarctic rift and/or to mass change of the Antarctic ice sheets. Horizontal displacements related to active neotectonic rifting, strike-slip translations, and volcanism will be tightly constrained by monitoring the combined TAMDEF and Italian VLNDEF networks of bedrock GPS stations along the Transantarctic Mountains and on offshore islands in the Ross Sea. Glacio-isostatic adjustments due to deglaciation since the Last Glacial Maximum and to modern mass change of the ice sheets will be modeled from GPS-derived crustal motions together with new information from other programs on the configurations, thicknesses, deglaciation history and modern mass balance of the ice sheets. Tectonic and rheological information from ongoing structural and seismic investigations in the Victoria Land region will also be integrated in the modeling. The integrative and iterative modeling will yield a holistic interpretation of neotectonics and ice sheet history that will help us to discriminate tectonic crustal displacements from viscoelastic/elastic glacio-isostatic motions. These results will provide key information to interpret broad, continental-scale crustal motion patterns detected by sparse, regionally distributed GPS continuous trackers and by spaceborne instruments. This study will contribute to international programs focused on Antarctic neotectonic and global change issues.Strategies to meet these science objectives include repeat surveys of key sites in the existing TAMDEF network, extension of the array of TAMDEF sites southward about 250 km along the Transantarctic Mountains, linked measurements with the VLNDEF network, and integration of quasi-continuous trackers within the campaign network. By extending the array of bedrock sites southward, these measurements will cross gradients in predicted vertical motion due to viscoelastic rebound. The southward extension will also allow determination of the southern limit of the active Terror Rift and will provide a better baseline for constraints on any ongoing tectonic displacements across the West Antarctic rift system as a whole that might be possible using GPS data collected by the West Antarctic GPS Network. This project will also investigate unique aspects of GPS geodesy in Antarctica to determine how the error spectrum compares to mid-latitude regions and to identify the optimum measurement and data processing schemes for Antarctic conditions. The geodetic research will improve position accuracies within our network and will also yield general recommendations for deformation monitoring networks in polar regions.An education and outreach program is planned and will be targeted at non-science-major undergraduate students taking Earth System Science at Ohio State University. The objective will be to illuminate the research process for nonscientists. This effort will educate students on the process of science and inform them about Antarctica and how it relates to global science issues.

OPP-0230285/OPP-0230356PI：Wilson、Terry J./Hothem、Larry D。该奖项由极地项目办公室的南极地质和地球物理项目提供，支持在扩展的跨南极山脉变形网络 (TAMDEF) 中对基岩地壳运动进行 GPS 测量的项目，以记录由于构造变形而产生的新构造位移 南极西部裂谷内和/或南极冰盖的质量变化。通过监测横跨南极山脉和罗斯海近海岛屿的 TAMDEF 和意大利 VLNDEF 基岩 GPS 站网络，与活跃的新构造裂谷、走滑平移和火山活动相关的水平位移将受到严格限制。自末次盛冰期以来的冰川消退和现代冰盖质量变化引起的冰川均衡调整将根据 GPS 得出的地壳运动以及来自其他项目的关于冰盖的结构、厚度、消冰历史和现代质量平衡的新信息进行建模。来自维多利亚地区正在进行的结构和地震调查的构造和流变信息也将集成到模型中。综合和迭代模型将对新构造运动和冰盖历史进行整体解释，这将有助于我们区分构造地壳位移和粘弹性/弹性冰川均衡运动。这些结果将为解释稀疏、区域分布的 GPS 连续跟踪器和星载仪器检测到的广泛的大陆尺度地壳运动模式提供关键信息。这项研究将为关注南极新构造和全球变化问题的国际计划做出贡献。实现这些科学目标的策略包括对现有 TAMDEF 网络中的关键站点进行重复调查、将 TAMDEF 站点阵列沿横贯南极山脉向南延伸约 250 公里、将测量与 VLNDEF 网络相连接，以及在活动网络中集成准连续跟踪器。通过向南延伸基岩地点阵列，这些测量结果将在由于粘弹性回弹而预测的垂直运动中交叉梯度。向南延伸还将允许确定活动恐怖裂谷的南部界限，并将为限制整个西南极裂谷系统正在进行的构造位移提供更好的基线，这可能使用西南极洲 GPS 网络收集的 GPS 数据来实现。该项目还将研究南极洲 GPS 大地测量的独特之处，以确定误差谱与中纬度地区的比较，并确定适合南极条件的最佳测量和数据处理方案。大地测量研究将提高我们网络内的位置精度，还将为极地地区的变形监测网络提供一般性建议。教育和推广计划正在计划中，该计划将针对俄亥俄州立大学地球系统科学专业的非科学专业本科生。目的是为非科学家阐明研究过程。这项工作将教育学生了解科学的过程，让他们了解南极洲以及它与全球科学问题的关系。