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Insight into lava dome extrusion dynamics from seismic signatures of pyroclastic flows and incandescent rockfalls: Volcán de Colima, México, 1998–2017
Bulletin of Volcanology ( IF 3.6 ) Pub Date : 2021-06-11 , DOI: 10.1007/s00445-021-01463-2
Vyacheslav M. Zobin , Carlos Navarro , Armando Tellez

The seismic signals of pyroclastic flows and rockfalls of incandescent fragments of lava dome and flows (PFIRs), generated during the seven lava dome–building episodes of the 1998–2017 eruption at Volcán de Colima, México, are collated. Our article presents an overview of a series of published relationships between lava dome dynamics and PFIR seismic signatures. The eruption episodes were characterized by different patterns of magma discharge varying from 41 × 107 m3 during episode 1 to 2 × 107 m3 during episode 4. The durations of episodes varied from 10 months (episode 7) to 53 months (episode 4). Continuous seismic monitoring of the eruption collected about 200,000 seismic signals associated with PFIRs. Temporal variations in daily PFIR counts identified rockfalls during the initial filling of the crater with lava, the timing of when dome emplacement filled the crater and lava flows began, and cases of consecutive lava flow emplacement. Changes in the spectral parameters of PFIR seismic signals generated during endogenous and exogenous growth of the dome and during the sequence of sustained collapses of the lava dome may indicate the origin and type of successive flows. These results may serve as the basis for using PFIR seismic signals to reconstruct lava dome dynamics during real-time observations or for subsequent analysis.



中文翻译:

从火山碎屑流和炽热落石的地震特征洞察熔岩穹顶挤压动力学:墨西哥科利马火山,1998-2017

对 1998 年至 2017 年墨西哥科利马火山喷发的七个熔岩穹顶建筑事件期间产生的火山碎屑流和熔岩穹顶和熔岩流(PFIR)的炽热碎片落石的地震信号进行了整理。我们的文章概述了一系列已发表的熔岩穹顶动力学与 PFIR 地震特征之间的关系。喷发期的特点是不同的岩浆排放模式,从第一期的 41 × 10 7 m 3到 2 × 10 7 m 3在第 4 集期间。集的持续时间从 10 个月(第 7 集)到 53 个月(第 4 集)不等。对喷发的连续地震监测收集了大约 200,000 个与 PFIR 相关的地震信号。每日 PFIR 计数的时间变化确定了在最初用熔岩填充火山口期间的落石,圆顶填充填充火山口和熔岩流的时间,以及连续熔岩流的情况。在穹顶的内生和外生生长以及熔岩穹顶持续坍塌的序列期间产生的 PFIR 地震信号的频谱参数的变化可能表明连续流动的起源和类型。这些结果可作为使用 PFIR 地震信号在实时观测或后续分析中重建熔岩穹顶动力学的基础。

更新日期:2021-06-11
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