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: 1756834
• 负责人: Christine Regalla
• 金额: $ 34.53万
• 依托单位: Trustees of Boston University
• 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 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1756834&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.

这项工作提供了第一个详细的描述，即在加拿大不列颠哥伦比亚省南部的活跃，陆上，浅层断层上发生的过去地震的行为。这项研究具有重要的社会利益，其中包括在温哥华岛，不列颠哥伦比亚省和美国华盛顿西北部的人口稠密地区提供地震危险评估所需的关键投入。这些类型的数据对于有助于告知公共政策的制定，这可以减少由于未来地震而降低生命和财产的损失。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，从而发展全球竞争性的STEM劳动力。该项目还支持对两位女性，早期职业科学家的研究，并促进了行业伙伴，政策制定者，科学家和学生之间的国际合作。该项目是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的三个突出断层的全新世滑道历史来评估卡斯卡迪亚北部北部的前臂变形中的作用。利用基岩映射和结构分析的结合，偏移第四纪沉积物的表面映射以及探索性的古糖[探索性古震沟，研究都在测试以下假设：新近鉴定的活跃的地壳断层有助于与Slab的相对平板运动的分量相对响应于Slab的板板的分量，这有助于主动的口语弯曲。这项工作提供了第一个季前活动的文档，以先前被认为是始新世的最后活跃的一组故障，并提供了基本的运动学和滑动历史记录数据，以测试板界边界应变分区的模型所必需的。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识优点和广泛的范围来评估的。

项目成果

Holocene Surface Rupture History of an Active Forearc Fault Redefines Seismic Hazard in Southwestern British Columbia, Canada

活动弧前断层的全新世表面破裂历史重新定义了加拿大不列颠哥伦比亚省西南部的地震危险

• DOI: 10.1029/2018gl078711
• 发表时间: 2018
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Morell, K. D.;Regalla, C.;Amos, C.;Bennett, S.;Leonard, L.;Graham, A.;Reedy, T.;Levson, V.;Telka, A.
• 通讯作者: Telka, A.

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