RAPID: Collaborative Research: Triggered Aftershocks and Tremors following the Kaikoura Earthquake recorded with Arrays (KEA)

RAPID：协作研究：用阵列记录的凯库拉地震后引发的余震和震颤 (KEA)

• 批准号: 1725302
• 负责人: Abhijit Ghosh
• 金额: $ 1.01万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-02-15 至 2019-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1725302&HistoricalAwards=false
• 关键词: RAPID; Collaborative; Research; Triggered; Aftershocks

This project supports the deployment a dense array of seismic arrays around the Cook Strait in New Zealand to record deep tectonic tremor and aftershocks following the M7.8 Kaikoura earthquake. This was the second largest seismic event since the European settlement in New Zealand, and it triggered deep and shallow slow-slip events along the Hikurangi subduction zone. The ongoing slow-slip events have apparently increased the probability of an M~8 megathrust earthquake in this region. Hence, this network can provide useful information on how slow-slip and tremor evolves on the megathrust following a large earthquake. This project involves international collaborations among United States, New Zealand and China, and will support a junior faculty at UC Riverside.Four mini-arrays (each has 12 5-s flex-nodes) together with 17 short-period and broadband seismometers, will be deployed around the Cook Strait for up to one year. This hybrid network is strategically planned to complement and take advantage of the existing and planned deployment in the area to be able to have high-resolution locations of seismic events in the region. Seismic data collected during this experiment will be made available to IRIS DMC as soon as the experiment is finished. The collected seismic data can be used to understand the relationship among the M7.8 Kaikoura mainshock, ongoing afterslip, triggered slow-slip events and the accompanying tremor activities, and quantify the physical mechanisms for tremor and microseismicity.

该项目支持在新西兰库克海峡周围部署密集的地震阵列，以记录7.8级凯库拉地震后的深部构造震动和余震。这是自欧洲人在新西兰定居以来的第二大地震事件，它引发了沿Hikurangi俯冲带的深、浅缓慢滑动事件。正在进行的慢滑事件明显增加了该地区发生M~8级特大逆冲地震的可能性。因此，这个网络可以提供有用的信息，说明大地震后大逆冲断层上的慢滑和震颤是如何演变的。该项目涉及美国、新西兰和中国之间的国际合作，并将支持加州大学河滨分校的一名初级教师。四个小型阵列（每个有12个5-s柔性节点）连同17个短周期和宽带地震仪，将在库克海峡周围部署长达一年的时间。该混合网络的战略规划是为了补充和利用该地区现有和计划部署的优势，从而能够在该地区获得地震事件的高分辨率位置。本次实验收集的地震数据将在实验结束后立即提供给IRIS DMC。利用收集到的地震资料，可以了解7.8级凯库拉主震、持续余震、触发慢滑事件与伴随的震颤活动之间的关系，量化震颤和微震活动的物理机制。