Imaging a growing lava dome with a portable radar

Imaging a growing lava dome with a portable radar
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使用便携式雷达对不断增长的熔岩穹丘进行成像

DOI:
10.1029/2006eo230003
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发表时间:
2011
期刊:
Eos, Transactions American Geophysical Union
影响因子:
--
通讯作者:
Wadge G
Wadge G
中科院分区:
--
文献类型:
--
作者:
Wadge G

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自从1995年7月苏弗里埃山火山(SHV)开始喷发以来,加勒比海的蒙特塞拉特小岛一直处于危机状态。由于其主要城镇普利茅斯在1997年被火山碎屑流摧毁,留下来的岛民不得不在岛的北半部重建他们的社会,受到来自南部火山不同程度的威胁。在此期间,蒙特塞拉特政府继续接受蒙特塞拉特火山观测站(MVO)关于火山危害的建议。持续的喷发为许多国际组织提供了丰富的研究机会,他们试图研究一个比利安山岩熔岩穹丘的生长和反复的部分破坏。圆顶的增长经历了三次:1995年11月至1998年3月,1999年11月至2003年7月,2005年8月至今。火山碎屑流和爆炸是主要的危险源。火山碎屑流主要是由熔岩穹丘的重力崩塌产生的,但也有由爆炸火山灰柱的崩塌产生的。圆顶坍塌往往发生在新熔岩加入的圆顶区域。同样,当熔岩挤压速率变化时,崩塌更有可能发生。此外,岩浆通道中岩浆的爆炸疏散倾向部分受岩浆供应速率控制,岩浆供应速率高有利于爆炸。
The tiny Caribbean island of Montserrat has been in a state of crisis since the Soufriere Hills Volcano (SHV) began its current eruption in July 1995. With its main town, Plymouth, destroyed by pyroclastic flows in 1997, the islanders who have remained have had to rebuild their society on the northern half of the island under varying degrees of threat from the volcano to the south. During this time, the Montserrat government continues to receive advice on the volcanic hazards from the Montserrat Volcano Observatory (MVO).The continuing eruption has provided a wealth of research opportunities for many international groups who sought to study the growth and repeated partial destruction of a Peleean andesitic lava dome. There have been three episodes of dome growth: November 1995 through March 1998, November 1999 through July 2003, and August 2005 to present. Pyroclastic flows and explosions have been the main source of hazard.The pyroclastic flows have been generated mainly by gravitational collapse of the lava dome, but also by collapse of explosive ash columns. The dome collapses tend to occur from the area of the dome where new lava is being added. Similarly collapses are more likely when the rate of lava extrusion varies. Also, the propensity of explosive evacuation of the magma in the conduit is partly controlled by the magma supply rate, with high rates favoring explosions.
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DOI: --
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