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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Eruption dynamics of the 23 February 2013 event at Mt. Etna
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Eruption dynamics of the 23 February 2013 event at Mt. Etna

机译:2013年2月23日在山峰的爆发动力学埃特纳火山

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Volcanic activity at Mt. Etna in the last decade has mostly been manifested by sequences of short paroxysmal episodes characterised by powerful lava fountains and high eruption columns. On the 23 February 2013, an exceptionally intense episode occurred at the New South-East Crater, producing a fountain >800 m high (among the highest ever recorded at Etna) and a similar to 9 km eruption column that dispersed ash >400 km from the vent. Textural and petrographic analyses of lapilli revealed that magma erupted during the high-intensity phase is characterised by low microlite contents (<7 area%), high vesicularity (76-83%), and high vesicle number densities (6-8.2 x 10(6) cm(-3)). The short-lived initial Strombolian explosions removed viscous magma from the conduit, enabling the rapid ascent of gas-rich, microlite-poor magma and the eruption of an 800 m high fountain and 9 km high eruption column. For the 23 February eruption, the high vesicularity and low microlite content of the pyroclasts support the hypothesis that volatile-rich magma was the driver of the high intensity lava fountain. This eruptive event, along with three other recent events at Etna over the last 15 years, can be defined as subplinian based on eruption rate and column height, but also generated incandescent 800-1000 m fountains. For these reasons, we propose to term this event, and others at Etna characterised by similar eruption features and parameters, as subplinian fountaining events. (C) 2019 Elsevier B.V. All rights reserved.
机译:山的火山活动。过去十年中,埃特纳火山大多表现为阵发性短发作的序列,其特征是强大的熔岩喷泉和高喷发柱。 2013年2月23日,在新东南火山口发生了异常强烈的事件,产生了一个高800m以上的喷泉(是埃特纳火山有记录以来的最高记录)和一个类似于9 km的喷发柱,其散布的灰分距离> 400 km。通风口。 lapilli的组织结构和岩石学分析表明,在高强度阶段喷出的岩浆具有低微岩含量(<7面积%),高囊泡性(76-83%)和高囊泡数密度(6-8.2 x 10( 6)cm(-3))。短暂的斯特伦伯利亚初始爆炸将管道中的粘性岩浆清除掉,从而使富含气体,微岩贫集的岩浆迅速上升,并喷出了800 m高的喷泉和9 km高的喷发柱。对于2月23日的喷发,火山碎屑岩的高囊泡性和低微岩含量支持了以下假设:富含挥发物的岩浆是高强度熔岩喷泉的驱动因素。根据喷发率和柱高,该喷发事件以及最近15年内在Etna的其他三起近期事件可以定义为亚平流层,但也产生了800-1000 m的白炽喷泉。由于这些原因,我们建议将此事件以及埃特纳火山中其他具有相似喷发特征和参数特征的事件称为亚平流泉事件。 (C)2019 Elsevier B.V.保留所有权利。

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