Ground deformation before the 2015 eruptions of Cotopaxi volcano detected by InSAR
Ground deformation before the 2015 eruptions of Cotopaxi volcano detected by InSAR
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InSAR 检测到 2015 年科托帕希火山喷发前的地面变形
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
P. Jarrín
中科院分区：
文献类型：
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作者：
A. M. Morales Rivera;F. Amelung;P. Mothes;Sang‐Hoon Hong;J. Nocquet;P. Jarrín
科托帕希火山于2015年4月开始了一段火山动荡时期，导致2015年8月至11月期间发生了一系列火山喷发。利用COSMO - SkyMed干涉合成孔径雷达，在2014-2016年连续GPS观测的支持下，获得了Cotopaxi火山与动荡期和爆发期相关的地面变形数据。我们发现了前兆变形的证据，在2015年4月至8月期间，西侧的最大隆升为3.4 cm。变形的原因是位于峰顶西南几公里处的一个倾斜的片状岩体，开口体积为6.8 × 106立方米，从12.1公里的深度延伸到峰顶以下5.5公里，这有助于内部大厦的生长。火山爆发前变形的时间巧合可能表明，Cotopaxi的短期喷发在一定程度上是由间歇性的大厦生长控制的。
Cotopaxi volcano started a period of volcanic unrest in April 2015 that led to a series of eruptions between August and November 2015. We use COSMO‐SkyMed Interferometric Synthetic Aperture Radar supported by continuous GPS observations spanning the period of 2014–2016 to obtain time‐dependent ground deformation data over Cotopaxi volcano related to the period of unrest and onset of eruptions. We find evidence of precursory deformation, with a maximum uplift on the western flank of 3.4 cm from April to August 2015. Deformation is explained by an inclined sheet intrusion located a few km southwest of the summit with an opening volume of 6.8 × 106 m3, extending from a depth of 12.1 km and shallowing to 5.5 km below the summit, that contributed to internal edifice growth. The temporal coincidence of deformation prior to the eruptions potentially suggests that short‐term eruptions at Cotopaxi are partly controlled by episodic edifice growth.