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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Spatial and temporal b-value characterization at Popocatepetl volcano, Central Mexico
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Spatial and temporal b-value characterization at Popocatepetl volcano, Central Mexico

机译：Popocatepetl Volcano，墨西哥中央的空间和时间B值表征

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摘要

We studied spatial and temporal variations in the b-value to investigate volcanic processes at Popocat & eacute;petl volcano, Central Mexico. For this purpose, we used data from the earthquake catalog compiled by the Centro Nacional de Prevenci & oacute;n de Desastres from 1995 to 2021. Significant variations in the b -value are detected, with b-value ranging from 0.52 to 2.9. We mapped two seismic clusters, the first one below the crater and the second one southeast of the summit region. High b-value volumes are located beneath the volcano. These volumes are located at the following depth intervals of 4 km a.s.l & ndash; 2 km b.s.l and 3 km a.s.l & ndash; 2 km b.s.l. The statistical tests showed that the selected low and high b-value regions are significant at a 99% confidence level. By comparing the earthquake locations and available focal mechanisms with the b-values, our analysis suggests no clear dependence of the b-values on the faulting style. We also compare the b-value distributions with seismic wave tomography studies obtaining a good correlation between the b-value mapped zones and low-velocity regions. We found evidence to relate high b-value anomalies with regions of high crack density and/or high pore pressure associated with the location of nearby magma bodies. Our interpretation is supported by geophysical evidence from seismic wave tomography. (c) 2021 Elsevier B.V. All rights reserved.
机译：我们研究了B值的空间和时间变化，以研究Popocat＆eacute的火山过程;墨西哥中部Petl火山。为此目的，我们使用由Centro Nacional de Prevenci和Oacute编辑的地震目录中的数据;从1995年到2021年的N de Desastres。检测到B-Value的显着变化，B值范围为0.52至2.9。我们映射了两个地震集群，第一个在火山口之下的第一个和峰会区域的第二个东南。高B值卷位于火山下方。这些卷位于以下4公里的深度间隔为4 km a.l＆ndash; 2公里B.S.L和3公里A.L＆Ndash; 2公里B.S.L.统计测试表明，所选择的低B值区域具有99％的置信水平。通过将地震位置和可用的焦点机制与B值进行比较，我们的分析表明对B值对故障风格的明确依赖性。我们还比较B值分布，地震波断层摄影研究获得B值映射区域与低速区域之间的良好相关性。我们发现有证据表明，与附近岩浆体的位置相关的高裂缝密度和/或高孔隙压力区域的高B值异常。我们的解释得到了地震波断层扫描的地球物理证据支持。 （c）2021 elestvier b.v.保留所有权利。

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