Magma chamber detected beneath an arc volcano with high-resolution velocity images

Magma chamber detected beneath an arc volcano with high-resolution velocity images
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通过高分辨率速度图像检测到弧火山下方的岩浆室

DOI:
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发表时间:
2022
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影响因子:
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通讯作者:
J. Morgan
J. Morgan
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文献类型:
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作者:
K. Chrapkiewicz;M. Paulatto;B. Heath;E. Hooft;P. Nomikou;C. Papazachos;F. Schmid;D. Toomey;M. R. Warner;J. Morgan

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弧火山下方是复杂的熔岩储层系统,从贫熔的糊状区域到熔岩丰富的岩浆室。岩石学和卫星数据表明,可喷发的岩浆室形成于地壳最顶部几公里处。然而,很少有岩浆室被明确定位,这表明大多数岩浆室寿命太短或太小而无法成像,这对危险评估和岩浆分化建模具有直接影响。在这里,我们使用基于反演完整地震波形的高分辨率技术来对标准地震层析成像无法检测到的小型高熔融分数岩浆室进行成像。希腊圣托里尼岛附近的一座海底火山科伦博 (Kolumbo) 的熔岩储层从海平面 (b.s.l.) 以下约 2 公里延伸到至少 4 公里。该室与最近地震群的终止点重合,可能是更深的熔体储层和火山口底部的高温热液系统之间缺失的一环。该房间构成了严重的危险,因为它可能在不久的将来产生高度爆炸性的海啸爆发。我们的结果表明,类似的储层(相对较小但熔体分数较高)可能在其他活火山中未被发现,这对现有的喷发预测和岩浆分异反应流模型提出了挑战。
Arc volcanoes are underlain by complex systems of molten-rock reservoirs ranging from melt-poor mush zones to melt-rich magma chambers. Petrological and satellite data indicate that eruptible magma chambers form in the topmost few kilometres of the crust. However, very few chambers have ever been definitively located, suggesting that most are too short-lived or too small to be imaged, which has direct implications for hazard assessment and modelling of magma differentiation. Here we use a highresolution technology based on inverting full seismic waveforms to image a small, high-melt-fraction magma chamber that was not detected with standard seismic tomography. The melt reservoir extends from ~2 to at least 4 km below sea level (b.s.l.) at Kolumbo – a submarine volcano near Santorini, Greece. The chamber coincides with the termination point of the recent earthquake swarms and may be a missing link between a deeper melt reservoir and the high-temperature hydrothermal system venting at the crater floor. The chamber poses a serious hazard as it could produce a highly explosive, tsunamigenic eruption in the near future. Our results suggest that similar reservoirs (relatively small but high melt-fraction) may have gone undetected at other active volcanoes, challenging the existing eruption forecasts and reactive-flow models of magma differentiation.
弧后构造作用、火山作用和质量消耗塑造了希腊火山弧圣托里尼-克里斯蒂安娜-阿莫尔戈斯地区的海底形态
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发表时间: 2019-11
期刊: Journal of Geophysical Research: Solid Earth
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发表时间: 2019-05-15
影响因子: 5.3
作者:
Hooft, E. E. E.;Heath, B. A.;Warner, M. R.
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从上地壳 P 波速度看圣托里尼火山周围的构造作用及其与岩浆作用的关系
DOI: 10.1029/2019jb017699
发表时间: 2019
期刊: Journal of Geophysical Research: Solid Earth
影响因子: --
作者:
Heath, B. A.;Hooft, E. E. E.;Toomey, D. R.;Papazachos, C. B.;Nomikou, P.;Paulatto, M.;Morgan, J. V.;Warner, M. R.
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