Correlated petrology and seismicity indicate rapid magma accumulation prior to eruption of Kizimen volcano, Kamchatka
Correlated petrology and seismicity indicate rapid magma accumulation prior to eruption of Kizimen volcano, Kamchatka
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相关的岩石学和地震活动表明堪察加半岛克济门火山喷发前岩浆快速积累
DOI：
10.1038/s43247-022-00622-3
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
S Senyukov & S Droznina
中科院分区：
文献类型：
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作者：
L Ostorero;H Balcone-Boissard;G Boudon;N Shapiro;A Belousov;M Belousova;A Auer;S Senyukov & S Droznina
喷发前危机期间地震次数和强度的增加是地震火山监测的主要依据。然而，对这些地震信号如何与火山喷发前岩浆管道系统中的岩浆过程有关的深入了解，对于这些努力是至关重要的。在这里，我们将2010-2013年堪察加Kizimen火山爆发-喷发之前的地震-火山危机的特征与岩浆管道系统中过程的时间尺度进行了比较。这些时间尺度是从喷发后采集的英安岩和富硅安山岩中88个带状斜方辉石晶体中铁镁互扩散的数值模拟中推断出来的。我们发现，可喷发的岩浆在喷发前1.5年左右开始的岩浆混合过程中迅速聚集，这与地震危机的开始有很好的相关性。我们的结论是，观测到的地震重新激活标志着岩浆混合的开始，并导致了储集层的不稳定，随后是喷发。
The increase in number and intensity of earthquakes during a pre-eruptive crisis is the main basis of seismic volcano monitoring. However, a strong understanding of how these seismic signals relate to magmatic processes in the magma plumbing systems prior to volcanic eruptions is crucial for these efforts. Here we compare the characteristics of a seismo-volcanic crisis prior to the 2010–2013 explosive-extrusive eruption of Kizimen volcano, Kamchatka with the timescales of processes in the magma plumbing system. These timescales are inferred from the numerical modelling of iron-magnesium intracrystalline interdiffusion in 88 zoned orthopyroxene crystals from dacites and silica-rich andesites collected after the eruption. We find that the eruptible magmas were assembled rapidly during a magma mixing process beginning around 1.5 years before the eruption, which is well correlated with the onset of the seismic crisis. We conclude that the observed seismic re-activation marked the onset of magma mixing and led to destabilization of the reservoir, followed by the eruption.