Stochastic ground motion simulation of earthquakes associated with September 19, 2021, Cumbre Vieja (La Palma Island) eruption: Determination of the quality factor Q, spectral decay parameter kappa, and site response

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Volcanology and Geothermal Research Pub Date : 2025-06-11 DOI:10.1016/j.jvolgeores.2025.108397

J. Rueda , J. Mezcua

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引用次数: 0

Abstract

The relatively strong damage caused by the seismicity associated with historical eruptions in La Palma (Canary Islands) makes it necessary to upgrade the seismic hazard of the island to produce seismic scenarios for future eruptions. Moreover, ancient earthquakes related to older eruptions can be studied if the seismic waves they produced are reproduced. To simulate such scenarios, the characteristics of the unknown earthquake must be determined: its focal characteristics including focal mechanism, location, magnitude, and stress drop; path properties, namely the geometrical spreading, quality factor Q, and its frequency dependence, along which the seismic waves propagate; and site effect. For the site effects, we considered the crustal and Vs30 amplification factors and the kappa value for the station, which represent the spectral amplitude diminution in the high-frequency band.

The simulation process used in this study is known as the stochastic simulation technique, which is based on the stochastic properties of strong ground motion and the utilization of a simple physical model for the source.

Considering the seismicity registered during the last eruption on the island of La Palma on September 19, 2021, we calculated the parameters required for the simulation to reproduce the strong ground motion of some of the recorded events. The adjustment of the observed to the recorded strong-motion records revealed the goodness of fit and the extent to which future simulations will be close to the real data.

The use of the calculated parameters in future studies would permit us to increase our knowledge of the seismic hazards on the island by considering different possible scenarios.

查看原文本刊更多论文

2021年9月19日Cumbre Vieja （La Palma Island）火山喷发相关地震的随机地面运动模拟：质量因子Q、谱衰减参数kappa和现场响应的确定

拉帕尔马（加那利群岛）历史火山喷发引起的地震活动造成了相对较强的破坏，因此有必要对该岛的地震危险性进行升级，以产生未来火山喷发的地震情景。此外，如果能重现火山喷发产生的地震波，就可以研究与较早喷发有关的古代地震。为了模拟这种情景，必须确定未知地震的特征：它的震源特征，包括震源机制、位置、震级和应力降；路径特性，即地震波沿其传播的几何扩展、质量因子Q及其频率依赖性；还有现场效应。对于场地效应，我们考虑了地壳和Vs30的放大因子以及台站的kappa值，它们代表了频谱幅度在高频波段的衰减。本研究使用的模拟过程被称为随机模拟技术，该技术基于强地震动的随机特性，并利用一个简单的震源物理模型。考虑到2021年9月19日拉帕尔马岛最后一次喷发期间记录的地震活动，我们计算了模拟所需的参数，以再现一些记录事件的强地面运动。将观测到的强震记录与记录的强震记录进行了调整，显示出拟合的良好程度，以及未来的模拟将在多大程度上接近真实数据。在未来的研究中使用计算出的参数将使我们能够通过考虑不同的可能情况来增加我们对岛上地震危险的认识。

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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来源期刊

Journal of Volcanology and Geothermal Research 地学-地球科学综合

CiteScore

5.90

自引率

13.80%

发文量

183

审稿时长

19.7 weeks

期刊介绍： An international research journal with focus on volcanic and geothermal processes and their impact on the environment and society. Submission of papers covering the following aspects of volcanology and geothermal research are encouraged: (1) Geological aspects of volcanic systems: volcano stratigraphy, structure and tectonic influence; eruptive history; evolution of volcanic landforms; eruption style and progress; dispersal patterns of lava and ash; analysis of real-time eruption observations. (2) Geochemical and petrological aspects of volcanic rocks: magma genesis and evolution; crystallization; volatile compositions, solubility, and degassing; volcanic petrography and textural analysis. (3) Hydrology, geochemistry and measurement of volcanic and hydrothermal fluids: volcanic gas emissions; fumaroles and springs; crater lakes; hydrothermal mineralization. (4) Geophysical aspects of volcanic systems: physical properties of volcanic rocks and magmas; heat flow studies; volcano seismology, geodesy and remote sensing. (5) Computational modeling and experimental simulation of magmatic and hydrothermal processes: eruption dynamics; magma transport and storage; plume dynamics and ash dispersal; lava flow dynamics; hydrothermal fluid flow; thermodynamics of aqueous fluids and melts. (6) Volcano hazard and risk research: hazard zonation methodology, development of forecasting tools; assessment techniques for vulnerability and impact.