RAPID: The East Anatolian fault earthquake sequence of 6 February 2023: epicentral afterslip and anticipated future rupture propagation

RAPID：2023 年 2 月 6 日东安纳托利亚断层地震序列：震中后滑和预期的未来破裂传播

• 批准号: 2318733
• 负责人: Roger Bilham
• 金额: $ 6.11万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-03-01 至 2025-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2318733&HistoricalAwards=false
• 关键词: RAPID; East; Anatolian; fault; earthquake

The PI proposes to build four "extensometers", which are devices that precisely measure offsets across faults exposed at the Earth's surface, and install them along the East Anatolian Fault Zone (EAFZ) in Turkey. The EAFZ is responsible for the M 7.8 and M 7.5 6 February 2023 earthquakes that recently devastated much of southeastern Turkey. These instruments will measure in detail how slow-motion offset along the fault is continuing, weeks to months after the earthquakes - and in the event of future earthquakes, they will measure sudden or gradual offsets across the fault. This information helps seismologists understand how earthquakes occur, estimate the probability of future large earthquakes in the region, and identify parts of the EAFZ that tend to move gradually instead of generating large earthquakes. The PI will be doing this work with Turkish scientists he knows well and has worked with in the past. He and his collaborators will also make needed repairs to extensometers monitoring other dangerous faults in Turkey, so they can send out their data in real time via 5G cellular service.The PI proposes to install four extensometers along segments of the East Anatolian Fault that were loaded by the 6 February 2023 M 7.8 and M 7.5 earthquakes. The extensometer data, together with seismic and geodetic observations, will provide information about ongoing postseismic creep and stress transfer, which feeds into probabilistic estimates of seismic hazard. These data will also constrain frictional properties of the EAFZ seismogenic zone and provide coseismic and postseismic slip constraints for potential, future EAFZ earthquakes. In addition to installing and telemetering new extensometers, the PI will work with Turkish colleagues to upgrade the telemetry on existing GAGE extensometers along the North Anatolian Fault Zone (NAFZ) to 5G. Bilham will work closely with Turkish scientists from Istanbul Technical University and Kandilli Observatory, strengthening an existing collaboration and sharing creepmeter design, installation, and interpretation knowledge with students. The new creep data will be freely and publicly shared via the UNAVCO/GAGE data archive.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.

PI建议建造四个“伸缩仪”，这是一种精确测量地表暴露断层偏移的设备，并将其沿着土耳其的东安纳托利亚断层带（EAFZ）安装。EAFZ是2023年2月6日M7.8和M7.5地震的罪魁祸首，最近摧毁了土耳其东南部的大部分地区。这些仪器将详细测量地震发生后数周到数月内，断层沿着的慢动作偏移有多持续--如果未来发生地震，它们将测量断层上突然或逐渐的偏移。这些信息有助于地震学家了解地震是如何发生的，估计该地区未来发生大地震的可能性，并确定EAFZ的部分地区倾向于逐渐移动而不是产生大地震。PI将与他熟悉并在过去合作过的土耳其科学家一起进行这项工作。他和他的合作者还将对监测土耳其其他危险断层的引伸计进行必要的维修，这样他们就可以通过5G蜂窝服务真实的时间发送他们的数据。PI建议沿着东安纳托利亚断层的沿着安装四个引伸计，这些断层在2023年2月6日的7.8级和7.5级地震中加载。伸缩仪数据，加上地震和大地测量观测，将提供有关正在进行的震后蠕变和应力转移的信息，这些信息将用于地震危险的概率估计。这些数据也将约束EAFZ孕震区的摩擦特性，并为未来EAFZ地震提供同震和震后滑动约束。除了安装和遥测新的引伸计外，PI还将与土耳其同事合作，将沿着北安纳托利亚断层带（NAFZ）的现有GAGE引伸计的遥测技术升级到5G。Bilham将与来自伊斯坦布尔技术大学和Kandilli天文台的土耳其科学家密切合作，加强现有的合作，并与学生分享蠕变计的设计，安装和解释知识。 新的蠕变数据将通过UNAVCO/GAGE数据档案免费公开共享。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。