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-0230356PIS：Wilson，Terry J./Hothem，Larry D.这项奖项，由南极计划办公室的南极地质学和地球物理学计划提供，支持一个项目，以进行GPS测量，以测量扩展的跨界山脉的床上层构造，以记录到thentrestic thentrestic网络，以记录到thentrestic fordressition docordition docorditions docorditions docorditions docorditions to to n neotortions to theotorcitions to the n neotections（在南极裂谷和/或南极冰盖的大规模变化。通过监测沿跨北极山脉和罗斯海的离岸岛屿的基岩GPS站的组合，将严格限制与主动新神经裂隙，滑移平移和火山的水平位移。自上次冰川最大和冰片的现代质量变化引起的冰川层次调整将从GPS衍生的地壳运动以及来自其他有关构型，厚度，脱胶历史和现代质量平衡的冰纸的新信息以及来自其他程序的新信息进行建模。维多利亚土地地区正在进行的结构和地震研究中的构造和流变信息也将集成到建模中。综合建模和迭代建模将对新原理和冰盖历史进行整体解释，这将有助于我们区分构造构造地壳位移与粘弹性/弹性谷胱甘肽 - 静态静态运动。这些结果将提供关键信息，以解释由稀疏，区域分布的GPS连续跟踪器和太空传播仪器检测到的广泛的大陆尺度的地壳运动模式。 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.通过向南延伸基岩地点的阵列，这些测量值将通过粘弹性反弹引起的垂直运动进行跨梯度。向南的扩展还将允许确定主动恐怖裂谷的南部极限，并将为整个南极裂谷系统的任何正在进行的构造流离失所的限制提供更好的基准，从而使用西南极GPS网络收集的GPS数据可能有可能。该项目还将研究南极GPS Geodesy的独特方面，以确定误差谱与中纬度区域的比较，并确定南极条件的最佳测量和数据处理方案。测量研究将提高我们网络中的位置精度，还将为极地地区的变形监测网络提供一般建议。计划和外展计划的计划是计划，并将针对非科学硕士本科生在俄亥俄州立大学学习地球系统科学。目的是照亮非认识主义者的研究过程。这项努力将教育学生有关科学的过程，并向他们告知南极及其与全球科学问题的关系。