Episodic transport of discrete magma batches beneath Aso volcano.

Episodic transport of discrete magma batches beneath Aso volcano.
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DOI:
10.1038/s41467-021-25883-y
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发表时间:
2021-09-21
影响因子:
16.6
通讯作者:
Song TA
Song TA
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Niu J;Song TA

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跨地壳岩浆系统中的岩浆上升、储存和释放是长期火山产出和短期喷发动力学的关键。一批独特的岩浆是如何从深层储集层(S)输送到具有可喷发岩浆的喷发前储存池的,仍然难以捉摸。在阿索火山下的重复甚长周期信号(VLP)之前,距VLP震源约3 公里处发生了一次短暂的(~50-100 )S同步形变事件。一个主要的体积成分(每个事件约50-440 m~3)和一个小角度正断层成分的来源机制,结合岩石学证据,表明离散的岩浆批次从超压洞顶到脆韧性转换区附近的喷发前储藏池的幕式运移。从最近2014年和2016年喷发前的反复变形事件中得出的岩浆上升速度、减压速率和累积岩浆产量与对喷发风格、火山喷发和羽流高度的回顾观察相一致,有望对即将到来的喷发进行实时评估。重复的浅层共振为解开岩浆管道系统深处的幕式岩浆运输提供了一条途径。阿索火山之下~1纳米放射性物质超过~100 S的幕式形变潜在地提供了火山长期产出与短期喷发动力学之间的联系。
Magma ascent, storage, and discharge in the trans-crustal magmatic system are keys to long-term volcanic output and short-term eruption dynamics. How a distinct magma batch transports from a deep reservoir(s) to a pre-eruptive storage pool with eruptible magma remains elusive. Here we show that repetitive very-long-period signals (VLPs) beneath the Aso volcano are preceded by a short-lived (~50–100 s), synchronous deformation event ~3 km apart from the VLP source. Source mechanism of a major volumetric component (~50–440 m3 per event) and a minor low-angle normal-fault component, together with petrological evidence, suggests episodic transport of discrete magma batches from an over-pressured chamber roof to a pre-eruptive storage pool near the brittle-ductile transition regime. Magma ascent velocity, decompression rate, and cumulative magma output deduced from recurrent deformation events before recent 2014 and 2016 eruptions reconcile retrospective observations of the eruption style, tephra fallouts, and plume heights, promising real-time evaluation of upcoming eruptions. Repetitive shallow resonances provide a pathway to unravelling episodic magma transport deep in the magma plumbing system. Episodic deformation of ~1 nanoradian over ~100 s beneath Aso volcano potentially provides a link between long-term volcanic output and short-term eruption dynamics.
DOI: 10.1007/978-3-540-49302-0_5
发表时间: 2006-01-01
期刊: VOLCANO DEFORMATION
影响因子: --
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影响因子: 16.6
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发表时间: 2018-04-26
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DOI: 10.1016/j.jvolgeores.2004.12.005
发表时间: 2005-05-30
影响因子: 2.9
作者:
Hase, H;Hashimoto, T;Tanaka, Y
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