不列颠哥伦比亚省西南部的震级估计和地点特征:应用于地震预警

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2024-05-23 DOI:10.1007/s10950-024-10216-5
Alireza Babaie Mahani, Eli Ferguson, Benoit Pirenne
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引用次数: 0

摘要

在这项研究中,我们通过分析加拿大海洋网络公司在不列颠哥伦比亚省西南部的地震预警系统的震级估计值,以及对陆上和近海台站的现场条件进行分析,对该系统进行了仔细研究。我们利用每个台站在数百次通报中估算出的震级值,提供了台站术语,以校正系统性产生高或低震级值的台站的震级。此外,通过汇编丰富的地面运动振幅数据集,并应用傅里叶加速度振幅和响应谱加速度的水平-垂直谱比方法,我们通过评估非线性站点响应行为和估算每个站点的站点主导频率(fpeak)及其峰值振幅(Apeak)来研究站点特征。一般来说,考虑到本研究中地面运动的震级-距离分布,没有在任何站点观察到强烈的非线性证据。近岸站点的 fpeak 和 Apeak 分别约为 1.7-6 Hz 和 0.4-1.2(以 10 为基数的对数单位),而陆上站点的 fpeak 约为 1-6 Hz,Apeak 约为 0.3-0.7(以 10 为基数的对数单位)。
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Magnitude estimation and site characterization in southwestern British Columbia: application to earthquake early warning

In this study, we took a close look at the Ocean Networks Canada’s earthquake early warning system in southwestern British Columbia through analysis of the magnitude estimates by this system and characterization of site conditions for both onshore and offshore stations. Using magnitude values estimated at each station, over hundreds of notifications, we provided station terms to correct the magnitudes for stations that systematically generate high or low magnitude values. Moreover, by compiling a rich ground motion amplitude dataset and applying the horizontal-to-vertical spectral ratio method from Fourier amplitude of acceleration and response spectral acceleration, we investigated site characterization through evaluation of non-linear site response behavior and estimation of the site dominant frequency (fpeak) and its peak amplitude (Apeak) for each station. In general, no strong evidence of non-linearity is observed at any stations considering the magnitude-distance distribution of ground motions in this study. Offshore sites show fpeak and Apeak in the range of approximately 1.7–6 Hz and 0.4–1.2 (in base-10 log unit), respectively, whereas onshore sites show approximately 1–6 Hz for fpeak and 0.3–0.7 (in base-10 log unit) for Apeak.

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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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