Assessing Earthquake Hazards in the Cascadia and Chilean Subduction Zones

评估卡斯卡迪亚和智利俯冲带的地震危险

• 批准号: RGPIN-2018-03719
• 负责人: Cassidy, John
• 金额: $ 2.88万
• 依托单位: University of Victoria
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 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=712519
• 关键词: Assessing; Earthquake; Hazards; Cascadia; Chilean

The objective of the proposed research program is to improve our assessments of earthquake hazards in both the Cascadia and Chilean subduction zones using a variety of new datasets combined with improved earth-imaging methodologies. Specifically, we will map select portions of the subduction zones in both Chile and Cascadia using data from new, dense seismic arrays. A variety of earth modelling techniques will be utilised, including seismic tomography and receiver function analysis. These will be integrated with recently improved Bayesian inversion methodologies. We will use recordings of four recent large subduction earthquakes in Chile, the 2010 (Mw 8.8) Maule earthquake, the 2014 (Mw 8.2) Iquique earthquake, the 2015 (Mw 8.3) Illapel earthquake, and the 2016 (Mw 7.6) Quellon earthquake, to examine variations in ground shaking with age of the subducting plate and style of subduction along the Chilean margin and will compare observed shaking levels (corrected for local site effects) with those used in national building codes in both Chile and Canada. Later stages of our research will focus on forecasting aftershocks from subduction earthquakes in Cascadia using observations from Chile where many more events occur (observations will include aftershock statistics, hypocentral locations, and faulting mechanisms and rupture area). The ultimate objective of our research is to help minimise the impact of future earthquakes in Canada and Chile. The anticipated outcomes and benefits of our research includes safer communities, more robust infrastructure, improved information for decision-making, and reduced losses from earthquakes that will occur in the future.

拟议研究计划的目标是利用各种新数据集与改进的地球成像方法相结合，改进我们对卡斯卡迪亚和智利俯冲带地震灾害的评估。具体来说，我们将使用来自新的密集地震阵列的数据绘制智利和卡斯卡迪亚俯冲带的选定部分。将利用各种地球建模技术，包括地震层析成像和接收器函数分析。这些将与最近改进的贝叶斯反演方法相集成。我们将使用智利最近发生的四次大型俯冲地震的记录，即 2010 年（兆瓦 8.8）马乌莱地震、2014 年（兆瓦 8.2）伊基克地震、2015 年（兆瓦 8.8）地震 8.3) 伊拉佩尔地震和 2016 年（兆瓦 7.6）奎隆地震，以检查地面震动随俯冲板块年龄和智利边缘俯冲类型的变化，并将观测到的震动水平（根据当地场地影响进行校正）与那些地震水平进行比较用于智利和加拿大的国家建筑规范。 我们研究的后期阶段将侧重于利用来自发生更多事件的智利的观测来预测卡斯卡迪亚俯冲地震的余震（观测将包括余震统计数据、震源位置、断层机制和破裂区域）。我们研究的最终目标是帮助最大程度地减少未来地震对加拿大和智利的影响。我们研究的预期成果和好处包括更安全的社区、更强大的基础设施、改进的决策信息以及减少未来发生的地震造成的损失。