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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Magma vesiculation and infrasonic activity at Stromboli open conduit volcano
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Magma vesiculation and infrasonic activity at Stromboli open conduit volcano

机译：Stromboli明渠火山岩浆冲泡和次声活动

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摘要

Explosive activity at Stromboli is explained in terms of dynamics of large gas bubbles that ascend in the magma conduit and burst at the free surface generating acoustic pressure that propagates as infrasonic signals in the atmosphere. The rate and the amplitude of the infrasonic activity is directly linked to the rate and the overpressure of the bursting gas bubbles and thus reflects the rate at which magma column degasses under non-equilibrium pressure conditions. We investigate the link between explosive degassing and magma vesiculation by comparing the rate of infrasonic activity with the bubble size distributions (BSDs) of scoria clasts collected during several days of explosive activity at Stromboli. BSDs of scoria show a characteristic power law distribution, which reflect a gas bubble concentration mainly controlled by a combined process of bubble nucleation and coalescence. The cumulative distribution of the infrasonic pressure follows two power laws, indicating a clear separation between the frequent, but weak, bursting of small gas bubbles (puffing) and the more energetic explosions of large gas slugs. The exponents of power laws derived for puffing and explosive infrasonic activity show strongly correlated (0.96) changes with time indicating that when the puffing rate is high, the number of energetic explosions is also elevated. This correlation suggests that both puffing and explosive activity are driven by the same magma degassing dynamics. In addition, changes of both infrasonic power law exponents are very well correlated (0.92 with puffing and 0.87 with explosions) with variations of the BSD exponents of the scoria clasts, providing evidence of the strong interplay between scoria vesiculation and magma explosivity. Our analysis indicates that variable magma vesiculation regimes recorded in the scoria correlate with the event number and energy of the explosive activity. We propose that monitoring infrasound on active volcanoes may be an alternative way to look at the vesiculation process in open conduit systems.
机译：用在岩浆管道中上升并在自由表面破裂的大气泡的动力学来解释斯特龙博利的爆炸活动，从而产生声压，并以次声信号的形式传播到大气中。次声活动的速率和幅度与破裂的气泡的速率和超压直接相关，因此反映了在非平衡压力条件下岩浆柱脱气的速率。我们通过比较次声活动的速率与在斯特龙博利（Stromboli）爆炸活动几天中收集的碎屑岩屑的气泡大小分布（BSD）的比率，研究了炸药脱气与岩浆囊化之间的联系。矿渣的BSD显示出特征性的幂律分布，其反映了主要由气泡成核和聚结的组合过程控制的气泡浓度。次声压的累积分布遵循两个幂定律，表明频繁但微弱的小气泡破裂（膨化）与较大的气团的高能爆炸之间存在明显的分离。膨化和次声活动的幂律指数显示出很强的相关性（0.96）随时间变化，表明当膨化率高时，高能爆炸的次数也会增加。这种相关性表明，膨化和爆炸活动都是由相同的岩浆脱气动力学驱动的。此外，两个次幂幂定律指数的变化与火山灰岩块的BSD指数的变化具有很好的相关性（吹气为0.92，爆炸岩为0.87），这提供了火山灰囊泡和岩浆爆炸性之间强烈相互作用的证据。我们的分析表明，记录在熔渣中的可变岩浆囊泡状态与爆炸活动的事件数量和能量相关。我们建议监视活动火山的次声可能是查看开放管道系统中囊泡过程的另一种方法。

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