使用多数据源的大蒙特利尔地区Vs30映射

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY Geosciences (Switzerland) Pub Date : 2023-08-23 DOI:10.3390/geosciences13090256
P. Rosset, Adil Takahashi, L. Chouinard
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引用次数: 1

摘要

蒙特利尔大都市社区(MMC)位于加拿大东部,位于魁北克西部地震带,以浅层地壳地震和中等地震活动为特征。大多数城市化地区都靠近圣劳伦斯河及其支流,并在该地区内,划定了尚普兰海粘土沉积物的延伸范围。在1988年Saguenay 5.8级地震之后,已经观察到这些最近的软沉积物对地震波的影响,并已证明在地震危害分析中至关重要。30 m土壤平均横波速度Vs,简称Vs30,是表征场地条件及其对地震波影响最常用的参数之一。自2000年以来,为蒙特利尔和拉瓦尔市开发了场地条件模型,将地震和钻孔数据结合起来,以减轻风险。本文介绍了MMC整个地区Vs30地图的扩展版本,该地区占魁北克人口的一半,包括额外的环境噪声记录、最近更新的井眼数据集、地质矢量图和未公布的地震折射数据,以获得v剖面。然后使用逆距离加权插值方法将数千个站点的估计Vs30值插值到0.01度的规则网格上。估计Vs30值最低的地区,在地震波上可能会有现场放大,这些地区位于MMC的东北部和西南部。该地图以站点类别的形式表示,并将其与最近感受到的公民观察所得的强度值进行比较。一般来说,报告的最高强度值出现在地图上Vs30值最低的地区。本规则不适用的领域,应进一步调查。该场地条件模型可用于地震灾害风险分析。
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Vs30 Mapping of the Greater Montreal Region Using Multiple Data Sources
The metropolitan community of Montreal (MMC) is located in Eastern Canada and included in the western Quebec seismic zone characterized by shallow crustal earthquakes and moderate seismicity. Most of the urbanized areas are settled close to the Saint-Lawrence River and its tributaries and within the region, delimiting the extension of the clay deposits from the Champlain Sea. The influence of these recent and soft deposits on seismic waves has been observed after the 1988 M5.8 Saguenay earthquake and has proven to be crucial in seismic hazard analysis. The shear-wave velocity Vs averaged over the 30 m of soil, abbreviated Vs30, is one of the most used parameters to characterize the site condition and its influence on seismic waves. Since 2000, a site condition model has been developed for the municipalities of Montreal and Laval, combining seismic and borehole data for risk mitigation purposes. The paper presents an extended version of the Vs30 mapping for the entire region of the MMC, which accounts for half of the population of Quebec, including additional ambient noise recordings, recently updated borehole datasets, geological vector map and unpublished seismic refraction data to derive Vs profiles. The estimated Vs30 values for thousands of sites are then interpolated on a regular grid of 0.01 degrees using the inverse distance weighted interpolation approach. Regions with the lowest estimated Vs30 values where site amplification could be expected on seismic waves are in the Northeastern part and in the Southwest of the MMC. The map expresses in terms of site classes is compared with intensity values derived from citizen observations after recent felt. In general, the highest reported intensity values are found in regions with the lowest Vs30 values on the map. Areas where this rule does not apply, should be investigated further. This site condition model can be used in seismic hazard and risk analysis.
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来源期刊
Geosciences (Switzerland)
Geosciences (Switzerland) Earth and Planetary Sciences-Earth and Planetary Sciences (all)
CiteScore
5.30
自引率
7.40%
发文量
395
审稿时长
11 weeks
期刊最新文献
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