Collaborative Research: Permanent forearc strain partitioning in Northern Cascadia

合作研究：卡斯卡迪亚北部永久前弧应变分区

• 批准号: 1756943
• 负责人: Kristin Morell
• 金额: $ 28.56万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-04-15 至 2023-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1756943&HistoricalAwards=false
• 关键词: Collaborative; Research; Permanent; forearc; strain

This work provides the first detailed characterization of the behavior of past earthquakes that have occurred on active, on-land, shallow faults in southern British Columbia, Canada. The research has important societal benefits that include providing key inputs needed for seismic hazard assessment in populated areas of Vancouver Island, British Columbia and northwestern Washington, USA. These types of data are necessary to help inform the development of public policy that can reduce the loss of life and property due to future earthquakes. Other important societal outcomes include contributions to STEM (science, technology, engineering and mathematics) education and the development of a diverse globally competitive STEM workforce by providing support for the training of graduate and undergraduate students. The project also supports the research of two female, early career scientists, and facilitates international collaborations between industry partners, policy makers, scientists and students. This project is evaluating the role of slab geometry and oblique convergence in the generation of forearc deformation in northern Cascadia by determining fault kinematics and the Holocene slip history of three prominent faults on Vancouver Island, British Columbia, Canada. Using a combination of bedrock mapping and structural analysis, surficial mapping of offset Quaternary deposits, and exploratory paleoseismic trenches, the research is testing the hypothesis that newly identified active crustal faults contribute to active oroclinal bending in response to the component of relative plate motion parallel to the strike of the slab. This work provides the first documentation of Quaternary activity on a set of faults previously thought to be last active in the Eocene, and provides fundamental kinematic and slip history data necessary to test models of plate boundary strain partitioning.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.

这项工作首次详细描述了过去在加拿大不列颠哥伦比亚省南部活动的陆地浅断层上发生的地震的行为。这项研究具有重要的社会效益，包括为温哥华岛、不列颠哥伦比亚省和美国华盛顿州西北部人口稠密地区的地震危险性评估提供所需的关键投入。这些类型的数据对于帮助制定能够减少未来地震造成的生命和财产损失的公共政策是必要的。其他重要的社会成果包括对STEM(科学、技术、工程和数学)教育的贡献，以及通过为研究生和本科生的培训提供支持，发展具有全球竞争力的多样化STEM劳动力队伍。该项目还支持两名女性早期职业科学家的研究，并促进行业合作伙伴、政策制定者、科学家和学生之间的国际合作。该项目正在通过确定断层运动学和加拿大不列颠哥伦比亚省温哥华岛三条突出断层的全新世滑移史来评估板片几何和倾斜会聚在卡斯卡迪亚北部弧前变形产生中的作用。利用基岩填图和构造分析、第四纪偏置矿床的地表填图和勘探的古地震沟相结合的方法，该研究正在检验这样一种假设，即新发现的地壳活动断裂有助于活动的造山斜弯曲，以响应平行于板块走向的相对板块运动分量。这项工作提供了第一份关于第四纪活动的文件，这组断层以前被认为是始新世最后一次活动的断层，并提供了检验板块边界应变划分模型所需的基本运动学和滑动历史数据。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Seismic Hazard Analyses From Geologic and Geomorphic Data: Current and Future Challenges

• DOI: 10.1029/2018tc005365
• 发表时间: 2020-10-01
• 期刊: TECTONICS
• 影响因子: 4.2
• 作者: Morell, Kristin D.;Styron, Richard;Onur, Tuna
• 通讯作者: Onur, Tuna

Paleoseismic Trenching Reveals Late Quaternary Kinematics of the Leech River Fault: Implications for Forearc Strain Accumulation in Northern Cascadia

• DOI: 10.1785/0120200204
• 发表时间: 2021-04
• 期刊: Bulletin of the Seismological Society of America
• 影响因子: 3
• 作者: N. Harrichhausen;K. Morell;C. Regalla;S. Bennett;L. Leonard;Emerson M. Lynch;E. Nissen

Plio‐Quaternary Outer Forearc Deformation and Mass Balance of the Southern Costa Rica Convergent Margin

• DOI: 10.1029/2019jb017986
• 发表时间: 2019-09
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: K. Morell;D. Fisher;N. Bangs

Eocene Terrane Accretion in Northern Cascadia Recorded by Brittle Left‐Lateral Slip on the San Juan Fault

圣胡安断层上脆性左滑记录的北卡斯卡迪亚始新世地体增生

• DOI: 10.1029/2022tc007317
• 发表时间: 2022
• 期刊: Tectonics
• 影响因子: 4.2
• 作者: Harrichhausen, Nicolas;Morell, Kristin D.;Regalla, Christine;Lynch, Emerson M.;Leonard, Lucinda J.
• 通讯作者: Leonard, Lucinda J.

Ongoing oroclinal bending in the Cascadia forearc and its relation to concave-outboard plate margin geometry

卡斯卡迪亚前弧持续的口斜弯曲及其与凹外侧板边缘几何形状的关系

• DOI: 10.1130/g45473.1
• 发表时间: 2019
• 期刊: Geology
• 影响因子: 5.8
• 作者: Finley, Theron;Morell, Kristin;Leonard, Lucinda;Regalla, Christine;Johnston, Stephen T.;Zhang, Wenbo
• 通讯作者: Zhang, Wenbo