Eruption frequency patterns through time for the current (1999-2018) activity cycle at Volcan de Fuego derived from remote sensing data: Evidence for an accelerating cycle of explosive paroxysms and potential implications of eruptive activity
Eruption frequency patterns through time for the current (1999-2018) activity cycle at Volcan de Fuego derived from remote sensing data: Evidence for an accelerating cycle of explosive paroxysms and potential implications of eruptive activity
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DOI：
10.1016/j.jvolgeores.2019.01.001
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发表时间：
2019-02-01
影响因子：
2.9
通讯作者：
Chun, Carla
中科院分区：
文献类型：
--
作者：
Naismith, Ailsa K.;Watson, I. Matthew;Chun, Carla
火地岛火山（Volcan de Fuego）是危地马拉的一座成层火山，自1524年以来已经产生了超过50次VEI >= 2的喷发。经过20年的平静，1999年，富埃戈进入了一个新的喷发活动时期，一直持续到今天，其特征是持续的斯特龙博利活动，偶尔穿插着更大规模的“阵发性”喷发，最近一次发生在2018年。富埃戈周围的土地可容纳成千上万的人，因此更好地了解其喷发行为对危险评估具有重要意义。然而，有相对较少的文献，研究最近（自1999年以来）活动的Fuego.Using遥感热数据的时间序列分析期间，2000-2018年结合最近的公告报告，我们提出的证据，一个新的喷发制度开始于2015年。我们发现，这一制度的特点是比前几年更频繁的突发性喷发，其特点是以下一系列事件：（i）熔岩流渗出和山顶爆炸活动增加，随后是（ii）持续24-48小时的强烈喷发阶段，产生持续的喷发柱、连续的爆炸和偶尔的火山碎屑流，其次是（iii）爆炸性活动减少。我们讨论了各种模型，解释这种阵发性频率的增加，并考虑其在Fuego的危害评估的影响。我们主张将遥感数据与监测报告相结合，以了解仪器不足的火山行为的长期变化。我们在这里提出的结果提供了一个标准，为未来的动荡和爆发性爆发的火地岛事件的知情评估。(C)2019 Elsevier B. V.版权所有。
Volcan de Fuego is a stratovolcano in Guatemala that has produced over 50 VEI >= 2 eruptions since 1524. After two decades of quiescence, in 1999 Fuego entered a new period of eruptive activity that continues until the present day, characterized by persistent Strombolian activity interspersed with occasional "paroxysmal" eruptions of greater magnitude, the most recent of which occurred in 2018. The land surrounding Fuego accommodates tens of thousands of people, so greater understanding of its eruptive behaviour has important implications for hazard assessment. Nevertheless, there is relatively little literature that studies recent (since 1999) activity of Fuego in detail.Using time-series analysis of remote sensing thermal data during the period 2000-2018 combined with recent bulletin reports, we present evidence for a new eruptive regime beginning in 2015. We find that this regime is defined by a greater frequency of paroxysmal eruptions than in previous years and is characterized by the following sequence of events: (i) effusion of lava flows and increase in summit explosive activity, followed by (ii) an intense eruptive phase lasting 24-48 h, producing a sustained eruptive column, continuous explosions, and occasional pyroclastic flows, followed by (iii) decrease in explosive activity. We discuss various models that explain this increase in paroxysmal frequency, and consider its implications for hazard assessment at Fuego. We advocate the pairing of remote sensing data with monitoring reports for understanding long-term changes in behaviour of poorly-instrumented volcanoes. The results that we present here provide a standard for informed assessment of future episodes of unrest and paroxysmal eruptions of Fuego. (C) 2019 Elsevier B.V. All rights reserved.