Top-down inflation and deflation at the summit of Kilauea Volcano, Hawai'i observed with InSAR
Top-down inflation and deflation at the summit of Kilauea Volcano, Hawai'i observed with InSAR
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DOI：
10.1029/2011jb009123
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发表时间：
2012-12-15
影响因子：
3.9
通讯作者：
Amelung, Falk
中科院分区：
文献类型：
--
作者：
Baker, Scott;Amelung, Falk
我们使用干涉合成孔径雷达 (InSAR) 研究 2000 年至 2008 年期间基拉韦厄火山山顶破火山口的变形，这期间涵盖了 2007 年东部裂谷区喷发事件和 2008 年正在进行的山顶喷发。该数据集由小基线子集 (SBAS) 时间序列组成，这些数据集是通过 Radarsat-1 卫星对三种不同波束模式进行 270 次采集而生成的。我们确定了 12 个具有不同位移模式的时期，直到 2003 年末，我们将其归因于长期构造驱动的变形，并将 2004 年至 2008 年归因于山顶区域的四个不同来源。我们将浅层岩浆系统建模为位于 Halemaumau 东北部地表以下 1.9 +/- 0.1 公里深度的球形储层（源 1）以及南部破火山口区域更深处的三个垂直堆积的岩床（源 2 位于破火山口南缘，深度为 2.9 +/- 0.2 公里，源 3 位于破火山口东南偏南 3.4 +/- 0.2 公里深度） 0.5 公里深，源 4 在火山口以南 3.6 +/- 0.4 公里深）。这些储层的注水和抽水顺序揭示了一个自上而下的过程，膨胀和紧缩的顺序都是从最浅的源头开始的。 2006 年 2 月和 2007 年 5 月，震源 3 的膨胀与上东部裂谷带的地震活动增强同时发生。震源 4 向西南裂谷带延伸，也显示出向西南裂谷带延伸的地震活动增强。引用：Baker, S. 和 F. Amelung (2012)，与 InSAR, J. Geophys 一起观察夏威夷基拉韦厄火山顶峰的自上而下的通货膨胀和通货紧缩。研究，117，B12406，doi：10.1029/2011JB009123。
We use interferometric synthetic aperture radar (InSAR) to study deformation of the summit caldera at Kilauea Volcano during 2000-2008, which spanned both an east rift zone eruptive event in 2007 and the start of the ongoing summit eruption in 2008. The data set consists of small baseline subset (SBAS) time series generated from 270 acquisitions on three separate beam modes from the Radarsat-1 satellite. We identify 12 time periods with distinct patterns of displacement that we attribute until late 2003 to secular tectonic-driven deformation and from 2004 to 2008 to four different sources in the summit area. We model the shallow magmatic system as a spherical reservoir at 1.9 +/- 0.1 km depth below the surface to the northeast of Halemaumau (source 1) and three vertically stacked sills at greater depths in the southern caldera area (source 2 at the southern edge of the caldera at 2.9 +/- 0.2 km depth, source 3 to the south-southeast of the caldera at 3.4 +/- 0.5 km depth, and source 4 south of the caldera at 3.6 +/- 0.4 km depth). The sequence for filling of and withdrawal from these reservoirs reveals a top-down process, with sequences of both inflation and deflation initiating in the shallowest source. Inflation of source 3 is coincident with elevated seismic activity in the upper east rift zone in February 2006 and May 2007. Source 4 is elongated toward the southwest rift zone and also shows elevated seismicity that extends toward the southwest rift zone. Citation: Baker, S., and F. Amelung (2012), Top-down inflation and deflation at the summit of Kilauea Volcano, Hawai'i observed with InSAR, J. Geophys. Res., 117, B12406, doi:10.1029/2011JB009123.