EAR-PF: The role of temperature of the crust and lithosphere in the magnitude and style of far-field deformation: EarthScope Transportable Array in Interior Alaska

EAR-PF：地壳和岩石圈的温度在远场变形的幅度和类型中的作用：阿拉斯加内陆的 EarthScope 可移动阵列

基本信息

批准号：
1725763
负责人：
JENNY NAKAI
金额：
$ 8.7万
依托单位：
Nakai Jenny
依托单位国家：
美国
项目类别：
Fellowship Award
财政年份：
2018
资助国家：
美国
起止时间：
2018-06-01 至 2021-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1725763&HistoricalAwards=false
关键词：
EAR PF role temperature crust

项目摘要

Dr. Jenny Nakai has been granted an NSF EAR Postdoctoral fellowship to carry out research and education activities at the University of New Mexico. Seismic data from the NSF-funded Transportable Array in Alaska and northwestern Canada are being utilized to investigate how deformation of a continent far from a plate boundary is controlled by the material properties of the Earth's crust and upper mantle. The influence of temperature, and therefore the strength, of the crust and upper mantle on topography of Interior Alaska north of the Alaska Range and a large (2000 km long), potentially weak continental fault are being explored. Analyzing the temperature of the crust and upper mantle will lead to improved understanding of why strike-slip faults form inland of major continental boundaries. Undergraduate students from underrepresented minorities in earth science are participating in the research. The PI is engaging in outreach to the Alaska Native Science and Engineering Program and Albuquerque Native American community college and undergraduate students in order to disseminate results and expose students to active Geophysics and Seismology research.Temperature of the lithosphere is known to influence the style of deformation inland of a major plate boundary (for example, in Tibet), but data sets on a continental scale in these environments are rare. The advent of the Transportable Array in Alaska and northwestern Canada provides the opportunity to investigate the strength profile of the crust and lithosphere. Key methodologies will include using Pn seismic velocities to constrain upper mantle lithologies and extrapolate upper mantle heat flow and investigating seismic energy attenuation using local earthquakes to infer temperature of the crust and upper mantle. The resulting lithologic and temperature constraints will be combined with local geologic information to recover strength profiles of the crust and lithosphere. The profiles will be interpolated to produce a 3D map of crustal and upper mantle strength throughout Interior Alaska, a region which the seismological community knows little about due to its inaccessibility. Results will be jointly interpreted with existing geophysical data to determine the role of rheology and temperature in the far-field deformation of the continent, and as a consequence, earthquake hazard in Interior Alaska.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

詹妮·纳凯（Jenny Nakai）博士已获得NSF耳朵博士后奖学金，以在新墨西哥大学开展研究和教育活动。来自阿拉斯加NSF资助的可运输阵列的地震数据正在利用来研究远离板界的大陆的变形如何受到地球地壳和上层地幔的材料特性的控制。地壳和上地幔的温度以及强度对阿拉斯加范围以北的阿拉斯加内部地形和大型（2000公里长）的影响，正在探索潜在的大陆断层。分析地壳的温度和上地幔的温度将提高人们对为什么在主要大陆边界内陆形成内陆形成滑带断层的理解。来自地球科学中代表性不足的少数民族的本科生正在参加这项研究。 PI正在与阿拉斯加本土科学与工程计划以及阿尔伯克基原住民社区学院和本科生进行宣传，以传播结果并使学生进入活跃的地球物理学和地震学研究。岩石圈的质量研究是已知的，旨在影响主要板块边界的变形风格（例如，在藏族中），但在整个范围内，都在范围内进行数据范围。可运输阵列在阿拉斯加和加拿大西北部的出现提供了研究地壳和岩石圈的强度特征的机会。关键方法将包括使用PN地震速度来限制上地幔岩性，并推断上地幔热流，并利用局部地震来研究地震能量衰减，以推断地壳和上地幔的温度。所得的岩性和温度限制将与局部地质信息结合使用，以恢复地壳和岩石圈的强度谱。这些剖面将被插值以在整个阿拉斯加内部的内部地区生成3D地壳和上地幔强度的3D图，这是地震界由于其无法获得的难题而了解的地区。结果将与现有的地球物理数据共同解释，以确定流变学和温度在非洲大陆远场变形中的作用，因此，阿拉斯加内部局部地震危险。这项奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和广泛影响的评估来评估。