西欧浅层地壳地震事件的震源参数和应力下降比例关系

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2024-01-16 DOI:10.1007/s10950-023-10188-y
Ming-Hsuan Yen, Dino Bindi, Adrien Oth, Ben Edwards, Riccardo Zaccarelli, Fabrice Cotton
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引用次数: 0

摘要

对于ω2震源模型,基于力矩的应力降估计值是通过结合角频率和地震力矩震源参数获得的。因此,基于力矩的应力降估计值可以提供动态破裂过程在高频辐射能量的信息。本研究旨在从欧洲尺度的统一数据集中系统地估算应力降,并描述应力降的分布特征,以应用于未来的随机模拟。我们分析了 1990 年 1 月至 2020 年 5 月期间在西欧发生的浅地壳地震事件的相关地震记录。我们处理了 22 万条高质量记录,并使用广义反演技术分离了震源、震区和路径的贡献。计算了 6135 个地震事件的震源参数,包括角频率、矩幅和应力降。所处理的事件主要是构造事件(如 2009-2016 年意大利中部序列地震),但与格罗宁根气田和西欧采矿活动相关的非构造事件也包含在分析中。对不同衰减模型和参考地点选择的影响进行了评估。所获得的大部分震源频谱都遵循标准的 ω2 模型,只有少数事件除外,因为这些事件所考虑的数据取样无法进行有效的频谱分解。所得到的应力降与 3 到 4 级之间的力矩大小呈正相关,而大于 4 级时则具有自相似性,平均应力降为 13.8 兆帕。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Source parameters and scaling relationships of stress drop for shallow crustal seismic events in Western Europe

For an ω2-source model, moment-based estimates of the stress drop are obtained by combining corner frequency and seismic moment source parameters. Therefore, the moment-based estimates of the stress drop are informative about the amount of energy radiated at high frequencies by dynamic rupture processes. This study aims to systematically estimate such stress drop from the harmonized dataset at the European scale and to characterize the distributions of the stress drop for application in future stochastic simulations. We analyze the seismological records associated with shallow crustal seismic events that occurred in Western Europe between January 1990 and May 2020. We processed 220,000 high-quality records and isolated the contributions of the source, site, and path contributions using the Generalized Inversion Technique. The source parameters, including the corner frequency, moment magnitude, and stress drop, of 6135 seismic events are calculated. The events processed are mainly tectonic events (e.g., earthquakes of the central Italy 2009–2016 sequence), although non-tectonic events associated with the Groningen gas field and mining activities in Western Europe are also included in the analysis. The impact of different attenuation models and reference site choices are evaluated. Most of the obtained source spectra follow the standard ω2-model except for a few events where the data sampling considered does not allow an effective spectral decomposition. The resulting stress drop shows a positive correlation with moment magnitude between 3 and 4, and a self-similarity for magnitudes greater than 4 with a mean stress drop of 13.8 MPa.

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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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