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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Volcanic emission and seismic tremor at Santiaguito, Guatemala: New insights from long-term seismic, infrasound and thermal measurements in 2018-2020
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Volcanic emission and seismic tremor at Santiaguito, Guatemala: New insights from long-term seismic, infrasound and thermal measurements in 2018-2020

机译：危地马拉圣地亚达火山排放和地震震颤：2018 - 2020年长期地震，基础驱动和热测量的新见解

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Long-term instrumental monitoring of open-vent volcanoes provides the necessary datasets to characterize volcanic activity and unravel its temporal changes. This is particularly important for active lava domes, which can undergo rapid transitions in behavior over the course of their eruption. Here, we analyzed seismic, acoustic infrasound and thermographic data collected between January 2018 and September 2020 to resolve volcanic processes taking place at the Santiaguito lava dome complex in Guatemala. During this period lava effusion filled the crater of the active Caliente lava dome. The extrusive activity was accompanied by small-to-moderate explosions, prolonged episodes of gas emissions, and occasional rockfalls. Automated algorithms were applied to identify seismic signals associated with different processes and to characterize the temporal evolution of activity. We identified-70-250 tectonic events per week and detected signals associated with gas-and ash explosions occurring at a rate of-70-100 events/week. Lava dome growth activity was accompanied by the emplacement of a lava flow along the eastern upper flank of Caliente and seismicity possibly due to the occurrence of rockfalls. We observed episodes of harmonic tremor in seismic and acoustic data associated with sustained gas emissions, estimated to originate at shallow depths of about 500-750 m below the crater. Data indicated that both the recurrence rate of tremor (-10-50 events/week) and its duration (-40-130 min/week) were slightly lower and shorter between January 2019 and March 2020 than in rest of the study period, despite minor variations in explosive activity. Finally, within a period of 11 weeks, between 18 January and 4 April 2018, we found 129 volcano tectonic earthquakes; we were able to locate 10 of them at depths between 1.3 and 2.3 km,-1.5 km southwest of Caliente. This multi-parametric study provides valuable insights into geophysical signals and associated processes at Santiaguito, helping to resolve temporal occurrence of each event type during protracted effusive-explosive activity.(c) 2020 Elsevier B.V. All rights reserved.
机译：通孔火山的长期乐器监测提供了必要的数据集，以表征火山活动并解开其时间变化。这对于活跃的熔岩圆顶尤为重要，这可以在他们的爆发过程中进行快速过渡。在这里，我们分析了2018年1月至9月2020年1月至9月在危地马拉的Santiaguito Lava圆顶综合体中解决了火山过程的地震，声学的基础集和热成像数据。在此期间，熔岩积液填充了活跃的Caliente Lava Dome的火山口。尿布活性伴有小于温和的爆炸，长期的气体排放发作，偶尔的岩石。应用自动化算法以识别与不同过程相关的地震信号，并表征活动的时间演化。我们确定了每周70-250个构造事件，并检测与气体和灰烬爆炸相关的信号，以70-100个事件/周的速率发生。熔岩圆顶的增长活动伴随着沿着岩石的东部侧翼的熔岩流的储蓄可能是由于岩石发生的发生。我们观察了与持续的气体排放相关的地震和声学数据中的谐波震颤的剧集，估计起源于火山口以下约500-750米的浅层。数据表明，震颤的复发率（-10-50个事件/周）及其持续时间（-40-130分钟/周）仍比2019年1月至2020年3月略低，较短，而不是在研究期间的其余部分。爆炸活动的次要变化。最后，在2018年1月18日至4月4日之间的11周内，我们发现了129个火山构造地震;我们能够在Caliente西南-1.5公里到-1.5公里的深度地定位其中10个。这个多参数研究提供了桑吉特托的地球物理信号和相关过程的有价值的见解，有助于解决在持续的爆炸活动期间每种事件类型的时间发生。（c）2020 Elsevier B.V.保留所有权利。

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