Coupled subdaily and multiweek cycles during the lava dome eruption of Soufrière Hills Volcano, Montserrat

Coupled subdaily and multiweek cycles during the lava dome eruption of Soufrière Hills Volcano, Montserrat
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蒙特塞拉特岛苏弗里埃尔山火山熔岩穹顶喷发期间的次日和多周耦合循环

DOI:
10.1002/jgrb.50095
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发表时间:
2013
期刊:
影响因子:
3.4
通讯作者:
Costa A
Costa A
中科院分区:
地球科学2区
文献类型:
--
作者:
Costa A

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对火山喷出安山岩熔岩产生熔岩穹顶的观察经常揭示出循环行为。在蒙特塞拉特岛的苏弗里耶尔山火山,亚日和多周周期的周期已多次得到认可。观察清楚地表明,亚日周期的周期受多周周期的调节。次日周期和多周周期分别被建模为岩脉与上覆圆柱形管道之间交界处的粘滑岩浆流,以及岩浆通过弹性壁岩脉的填充和排出。在这里,我们将这两个模型结合起来,描述从 1997 年 5 月 13 日到 9 月 21 日,经过良好观察的多周周期以及伴随的亚日周期的行为。耦合模型很好地捕捉到了不对称的一阶行为:多周周期的前 40% 由堤坝水库自身排放时的短周期/高振幅次日周期期间的高熔岩挤出率组成。循环的其余部分涉及随着更多岩浆的储存而增加压力,并且挤出率下降,随后亚日循环的周期逐渐增加。
Observations of volcanoes extruding andesitic lava to produce lava domes often reveal cyclic behavior. At Soufrière Hills Volcano, Montserrat, cycles with subdaily and multiweek periods have been recognized on many occasions. Observations clearly show that the period of subdaily cycles is modulated by the multiweek cycle. The subdaily and multiweek cycles have been modeled separately as stick‐slip magma flow at the junction between a dyke and an overlying cylindrical conduit and as the filling and discharge of magma through the elastic‐walled dyke, respectively. Here, we couple these two models to describe the behavior over a period of well‐observed multiweek cycles, with accompanying subdaily cycles, from 13 May to 21 September 1997. The coupled model captures well the asymmetrical first‐order behavior: the first 40% of the multiweek cycle consists of high rates of lava extrusion during short period/high amplitude subdaily cycles as the dyke reservoir discharges itself. The remainder of the cycle involves increasing pressurization as more magma is stored, and extrusion rate falls, followed by a gradual increase in the period of the subdaily cycles.
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发表时间: 2007
期刊: Earth, Planets and Space
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发表时间: 2010
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DOI: 10.1144/gsl.mem.2002.021.01.13
发表时间: 2002-01-01
期刊: ERUPTION OF SOUFRIERE HILLS VOLCANO, MONTSERRAT, FROM 1995 TO 1999
影响因子: --
作者:
Druitt, TH;Young, SR;Voight, B
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DOI: 10.1016/j.tecto.2008.10.021
发表时间: 2009
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发表时间: 2010
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