Characterization of open and closed volcanic systems in Indonesia and Mexico using InSAR time series
Characterization of open and closed volcanic systems in Indonesia and Mexico using InSAR time series
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DOI：
10.1002/jgrb.50288
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发表时间：
2013-08-01
影响因子：
3.9
通讯作者：
Aoki, Y.
中科院分区：
文献类型：
--
作者：
Chaussard, E.;Amelung, F.;Aoki, Y.
我们使用2007-2011年高级陆地观测卫星（ALOS）数据对跨墨西哥火山带（TMVB）进行弧宽干涉合成孔径雷达（干涉合成孔径雷达）时间序列调查，并研究根据Chaussard和Amelung（2012年）2007-2009年研究选择的四个印度尼西亚火山随时间变化的地面变形。我们的目标是研究弧火山是否表现出长期的大厦范围内的周期性变形模式，可用于表征开放和封闭的火山系统，并更好地约束在这种情况下，预期通货膨胀。我们揭示变形周期在定期活动和以前不活跃的印尼火山，但我们没有检测到变形的TMVB，反映了较低的活动水平。我们确定了三种类型的变形和活动之间的关系：通货膨胀之前，喷发和相关或随后的通缩（Kerinci和Sinabung），通货膨胀没有喷发，随后缓慢的通缩（阿贡），和喷发没有明显的变形（默拉皮，科利马和Popocatepetl;在默拉皮，没有显着的变形，即使在喷发过程中检测）。前两种情况对应于封闭的火山系统，并表明岩浆系统和喷发周期的传统模型确实适用于安山质火山（即，膨胀和紧缩事件与岩浆积累或挥发性出溶在地壳水库，随后爆发或就地冷却）。相反，最后一种情况对应于开放的火山系统，在喷发之前没有发生岩浆储层的显著加压，因此无法检测到长期的建筑物范围的地面变形。我们讨论这些结果的干涉合成孔径雷达的预测火山动荡的潜力。
We use 2007-2011 Advanced Land Observing Satellite (ALOS) data to perform an arc-wide interferometric synthetic aperture radar (InSAR) time series survey of the Trans-Mexican Volcanic Belt (TMVB) and to study time-dependent ground deformation of four Indonesian volcanoes selected following the 2007-2009 study of Chaussard and Amelung (2012). Our objectives are to examine whether arc volcanoes exhibit long-term edifice-wide cyclic deformation patterns that can be used to characterize open and closed volcanic systems and to better constrain in which cases precursory inflation is expected. We reveal deformation cycles at both regularly active and previously inactive Indonesian volcanoes, but we do not detect deformation in the TMVB, reflecting a lower activity level. We identify three types of relationships between deformation and activity: inflation prior to eruption and associated with or followed by deflation (Kerinci and Sinabung), inflation without eruption and followed by slow deflation (Agung), and eruption without precursory deformation (Merapi, Colima, and Popocatepetl; at Merapi, no significant deformation is detected even during eruption). The first two cases correspond to closed volcanic systems and suggest that the traditional model of magmatic systems and eruptive cycles do apply to andesitic volcanoes (i.e., inflation and deflation episodes associated with magma accumulation or volatile exsolution in a crustal reservoir followed by eruptions or in situ cooling). In contrast, the last case corresponds to open volcanic systems where no significant pressurization of the magmatic reservoirs is taking place prior to eruptions and thus no long-term edifice-wide ground deformation can be detected. We discuss these results in terms of InSAR's potential for forecasting volcanic unrest.