OFI SF5 Investigation of Seismicity Offshore Nova Scotia and Newfoundland

OFI SF5 新斯科舍省和纽芬兰省近海地震活动调查

• 批准号: 559829-2020
• 负责人: Zhang, Miao
• 金额: $ 1.75万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=706838
• 关键词: OFI; SF5; Investigation; Seismicity; Offshore

Seismicity rates offshore Atlantic Canada are relatively low and attract less attention than the west coast of North America. However, strong earthquakes, for which the recurrence time is not quantified yet, can still occur in the Maritimes. For example, the 1929 magnitude-7.2 "Grand Banks" earthquake generated a massive submarine landslide that triggered a tsunami that inundated southern Newfoundland, killing 28 and creating widespread damage to coastal communities of Nova Scotia and Newfoundland. Recent studies have suggested that most historical submarine landslides on the Scotian margin have been triggered by earthquakes. However, the regional seismicity (Fig. 1) and fault structures remain poorly understood and documented, due to the lack of nearby seismic stations. This project aims to detect and locate 1-2 orders of magnitude more small earthquakes and so, for the first time, delineate seismic fault zones offshore of Nova Scotia and Newfoundland using a dense temporary seismic network (Fig. 1) and state-of-the-art seismic detection and location methods. The Seed project is focused on comprehensive investigation of the seismicity and fault distribution in the region. This will in turn improve our understanding of seismic and tsunami hazard risk assessment for offshore Nova Scotia and Newfoundland and its onshore impact.

加拿大大西洋沿岸近海的地震活动率相对较低， 北美西海岸。然而，强震，其复发时间是不是 然而，在海洋时代仍然可以发生。例如，1929年的7.2 "大 班克斯地震引发了大规模的海底山体滑坡，引发了海啸， 洪水淹没了纽芬兰南部，造成28人死亡，并对沿海地区造成广泛破坏。 新斯科舍省和纽芬兰的社区。最近的研究表明， 历史上，苏格兰边缘的海底滑坡是由地震引发的。 然而，区域地震活动（图1）和断层结构仍然知之甚少， 由于附近缺乏地震观测站，该项目旨在检测和定位1 - 2 数量级的小地震，因此，第一次， 使用密集的临时地震网络，对新斯科舍省和纽芬兰近海地区进行了地震监测（图1）。 1)以及最先进的地震探测和定位方法。种子项目的重点是 地震活动性和断层分布的综合调查。这将在 提高我们对近海Nova地震和海啸灾害风险评估的认识 斯科舍和纽芬兰及其陆上影响。