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首页> 外文期刊>Journal of Volcanology and Geothermal Research >The 2007 eruption of Stromboli volcano: Insights from real-time measurement of the volcanic gas plume CO_2/SO_2 ratio
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The 2007 eruption of Stromboli volcano: Insights from real-time measurement of the volcanic gas plume CO_2/SO_2 ratio

机译：斯特龙博利火山2007年爆发：实时测量火山气柱CO_2 / SO_2比率的见解

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摘要

The recent eruption of Stromboli in February-April 2007 offered a unique chance to test our current understanding of processes driving the transition from ordinary (persistent Strombolian) to effusive activity, and the ability of instrumental geophysical and geochemical networks to interpret and predict these events. Here, we report on the results of two years of in-situ sensing of the CO_2/SO_2 ratio in Stromboli's volcanic gas plume, in the attempt to put constraints on the trigger mechanisms and dynamics of the eruption. We show that large variations of the plume CO_2/SO_2 ratio (range, 0.9-26) preceded the onset of the eruption (since December 2007), interrupting a period of relatively-steady and low ratios (time-averaged ratio, 4.3) lasting from at least May to November 2006. By contrasting our observations with numerical simulations of volcanic degassing at Stromboli, derived by use of an equilibrium saturation model, we suggest that the pre-eruptive increase of the ratio reflected an enhanced supply of deeply-derived CO_2-rich gas bubbles to the shallow-plumbing system. This larger-than-normal ascent of gas bubbles was likely sourced by a 1-3 km deep gas-melt separation region (probably a magma storage zone), and caused faster convective overturning of magmas in the shallow conduit; an increase in the explosive rate and in seismic tremor, and finally the collapse of the la Sciara del Fuoco sector triggering the effusive phase. The high CO_2/SO_2 ratios (up to 21) observed during the effusive phase, and particularly in the days and hours before a paroxysmal explosion on March 15, 2007, indicate the persistence of the same gas source; and suggest that de-pressurization of the same 1-3 km deep magma storage zone could have been the trigger mechanism for the paroxysm itself.
机译：最近在2007年2月至4月爆发的斯特龙博利火山爆发，提供了一个难得的机会，可以检验我们目前对推动从普通（持久性斯特龙伯隆岩）向喷发性活动过渡的过程的理解，以及仪器地球物理和地球化学网络解释和预测这些事件的能力。在这里，我们报告了两年就斯特隆博利火山气柱中CO_2 / SO_2比值进行原位检测的结果，以试图限制喷发的触发机制和动力学。我们发现，羽状CO_2 / SO_2比率（范围为0.9-26）的大变化发生在喷发开始（自2007年12月起）之前，中断了一段相对稳定且比率较低（时间平均比率为4.3）的持续时间至少从2006年5月至11月。通过将我们的观测结果与使用平衡饱和度模型得出的斯特龙博利火山脱气的数值模拟进行对比，我们认为，该比例的喷发前增加反映了深层CO_2的供应增加到浅水系统的气泡。气泡的这种比正常情况大的上升可能是由1-3公里深的熔体分离区（可能是岩浆储存区）引起的，并导致浅管道中岩浆的对流翻转更快。爆炸速度和地震震颤的增加，最终la Sciara del Fuoco区域的崩溃触发了喷发阶段。在喷发阶段，特别是在2007年3月15日阵发性爆炸发生前的几天和几小时内，观察到的高CO_2 / SO_2比值（高达21）表明该气体源持续存在。并暗示，相同的1-3公里深的岩浆储存区的降压可能是引发发作的触发机制。

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