权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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.

Jenny Nakai 博士已获得 NSF EAR 博士后奖学金，在新墨西哥大学开展研究和教育活动。美国国家科学基金会资助的位于阿拉斯加和加拿大西北部的可移动阵列的地震数据被用来研究远离板块边界的大陆的变形是如何受到地壳和上地幔的材料特性控制的。目前正在探索地壳和上地幔的温度以及强度对阿拉斯加山脉以北的阿拉斯加内陆地区以及一条大型（2000 公里长）潜在的弱大陆断层的影响。分析地壳和上地幔的温度将有助于更好地理解为什么走滑断层形成于主要大陆边界的内陆。来自地球科学领域代表性不足的少数族裔的本科生正在参与这项研究。该项目负责人正在向阿拉斯加原住民科学与工程项目以及阿尔伯克基美国原住民社区学院和本科生进行推广，以传播研究结果并使学生接触到活跃的地球物理学和地震学研究。众所周知，岩石圈的温度会影响主要板块边界内陆的变形方式（例如西藏），但在这些环境中大陆尺度的数据集很少。阿拉斯加和加拿大西北部可运输阵列的出现提供了研究地壳和岩石圈强度分布的机会。关键方法将包括使用 Pn 地震速度来约束上地幔岩性并推断上地幔热流，以及使用局部地震研究地震能量衰减以推断地壳和上地幔的温度。由此产生的岩性和温度约束将与当地地质信息相结合，以恢复地壳和岩石圈的强度剖面。这些剖面将被插值以生成整个阿拉斯加内陆地壳和上地幔强度的 3D 地图，该地区由于交通不便，地震学界对其知之甚少。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大陆远场变形中的作用，从而确定阿拉斯加内陆的地震危险。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力优点和更广泛的影响审查标准进行评估，被认为值得支持。