Volcanic Unrest at Taupō Volcano in 2019: Causes, Mechanisms and Implications

Volcanic Unrest at Taupō Volcano in 2019: Causes, Mechanisms and Implications
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2019 年陶波火山的火山动荡:原因、机制和影响

DOI:
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发表时间:
2021
影响因子:
3.5
通讯作者:
F. Wadsworth
F. Wadsworth
中科院分区:
地球科学2区
文献类型:
--
作者:
F. Illsley‐Kemp;S. Barker;C. Wilson;C. Chamberlain;S. Hreinsdóttir;S. Ellis;I. Hamling;M. Savage;E. Mestel;F. Wadsworth

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新西兰的陶普火山是一座大型破火山口火山,在全新世一直非常活跃。它最近一次喷发大约在1800年前,但也有多个历史时期的火山动荡。我们使用地震学和大地测量学分析表明,2019年陶普岛经历了一段动荡时期,其特征是通过多个群体增加地震活动,并伴有火山口内的地面变形。这些地震,包括非双偶事件,在最近的火山喷发口下勾勒出了一个地震带。根据地面变形数据的正演模拟,这个地震带与一个膨胀震源一致。我们推断,这一地震变形区圈定了现今岩浆储层的位置,该储层体积≥250km3,熔体分数为bbb20 ~ 30%,抑制了地震活动。我们的分析表明,2019年陶普岛的动荡在本质上和起源上都是火山爆发,这表明这是一座活跃的、有潜在危险的火山,提高我们对其行为的监测和理解很重要。
Taupō volcano, New Zealand, is a large caldera volcano that has been highly active through the Holocene. It most recently erupted ∼1,800 years ago but there have been multiple periods of historic volcanic unrest. We use seismological and geodetic analysis to show that in 2019 Taupō underwent a period of unrest characterized by increased seismic activity through multiple swarms and was accompanied by ground deformation within the caldera. The earthquakes, which include non‐double‐couple events, serve to outline an aseismic zone beneath the most recent eruptive vents. This aseismic zone is coincident with an inflating source, based on forward modeling of ground deformation data. We infer that this aseismic and deforming region delineates the location of the present day magma reservoir that is ≥250 km3 in volume and has a melt fraction of >20%–30%, inhibiting seismic activity. Our analysis shows that the 2019 unrest at Taupō was volcanic in nature and origin, demonstrating that this is an active and potentially hazardous volcano, and that improving our monitoring and understanding of its behavior is important.
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