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A Bayesian reassessment of the relationship between seismic moment and magmatic intrusion volume during volcanic unrest
Journal of Volcanology and Geothermal Research ( IF 2.4 ) Pub Date : 2021-08-31 , DOI: 10.1016/j.jvolgeores.2021.107375
Kerry Meyer 1 , Juliet Biggs 1 , Willy Aspinall 1
Affiliation  

Volcano-tectonic (VT) earthquake swarms are usual precursors to volcanic eruptions and their dynamic phenomenologies are an invaluable eruption forecasting tool. A power-law relationship between cumulative seismic moment release and intrusion volume has been proposed for both well injection sites and VT swarms. Here we compile data from 17 geodetically-studied VT swarms and use a Bayesian methodology to assess the relationship between cumulative moment release and subsurface volume change. We find that the empirical relationship derived from injection sites systematically underpredicts volume changes observed during VT swarms near volcanoes. A new relationship derived specifically from VT swarms provides a better fit, but large uncertainties mean that estimates of intruded volume range by three orders of magnitude (95% confidence) for a given cumulative seismic moment release. We further subdivide the dataset, and although the sample size is too small to meet conventional statistic hypothesis significance tests, qualitative inspection suggests that the seismic moment release is proportionally larger for unrest swarms which culminate in eruption. We conclude that the currently available dataset is too sparse and the uncertainties too large for use for reliably forecasting eruption magnitude; however, as the dataset of cases grows, further analysis along these same lines may provide improved diagnostic insights into eruption-related processes that may be driving seismic moment release in VT swarms.



中文翻译:

火山动荡期间地震矩与岩浆侵入量关系的贝叶斯再评估

火山构造 (VT) 地震群通常是火山喷发的前兆,它们的动态现象学是一种非常宝贵的喷发预测工具。已经为井注入点和 VT 群提出了累积地震矩释放和侵入体积之间的幂律关系。在这里,我们汇编了来自 17 个大地测量研究的 VT 群的数据,并使用贝叶斯方法来评估累积力矩释放与地下体积变化之间的关系。我们发现,从注入点得出的经验关系系统地低估了在火山附近的 VT 群期间观察到的体积变化。专门从 VT 群派生的新关系提供了更好的拟合,但很大的不确定性意味着对于给定的累积地震矩释放,侵入体积的估计值相差三个数量级(95% 置信度)。我们进一步细分了数据集,尽管样本量太小而无法满足传统的统计假设显着性检验,但定性检查表明,对于以爆发达到高潮的动乱群,地震矩释放成比例地更大。我们得出的结论是,目前可用的数据集太稀疏,不确定性太大,无法可靠地预测喷发幅度;然而,随着案例数据集的增长,沿着这些相同的路线进一步分析可能会提供对可能驱动 VT 群中地震矩释放的喷发相关过程的更好的诊断见解。虽然样本量太小,无法满足传统的统计假设显着性检验,但定性检查表明,对于以爆发达到顶点的动乱群,地震矩释放成比例地更大。我们得出的结论是,目前可用的数据集太稀疏,不确定性太大,无法可靠地预测喷发幅度;然而,随着案例数据集的增长,沿着这些相同的路线进一步分析可能会提供对可能驱动 VT 群中地震矩释放的喷发相关过程的更好的诊断见解。虽然样本量太小,无法满足传统的统计假设显着性检验,但定性检查表明,对于以爆发达到顶点的动乱群,地震矩释放成比例地更大。我们得出的结论是,目前可用的数据集太稀疏,不确定性太大,无法可靠地预测喷发幅度;然而,随着案例数据集的增长,沿着这些相同的路线进一步分析可能会提供对可能驱动 VT 群中地震矩释放的喷发相关过程的更好的诊断见解。我们得出的结论是,目前可用的数据集太稀疏,不确定性太大,无法可靠地预测喷发幅度;然而,随着案例数据集的增长,沿着这些相同的路线进一步分析可能会提供对可能驱动 VT 群中地震矩释放的喷发相关过程的更好的诊断见解。我们得出的结论是,目前可用的数据集太稀疏,不确定性太大,无法可靠地预测喷发幅度;然而,随着案例数据集的增长,沿着这些相同的路线进一步分析可能会提供对可能驱动 VT 群中地震矩释放的喷发相关过程的更好的诊断见解。

更新日期:2021-09-15
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