Deformation of the Augustine Volcano, Alaska, 1992-2005, measured by ERS and ENVISAT SAR interferometry

Deformation of the Augustine Volcano, Alaska, 1992-2005, measured by ERS and ENVISAT SAR interferometry
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DOI:
10.1186/bf03352811
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发表时间:
2008-01-01
影响因子:
3
通讯作者:
Won, Joong-Sun
Won, Joong-Sun
中科院分区:
地球科学3区
文献类型:
--
作者:
Lee, Chang-Wook;Lu, Zhong;Won, Joong-Sun

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奥古斯丁火山(英语:Augustine Volcano)是一座位于阿拉斯加州安克雷奇西南约290公里的库克湾(Cook Inlet)上的锥形活火山。奥古斯丁经历了七次重大的爆炸性喷发,分别在1812年、1883年、1908年、1935年、1963年、1976年、1986年和2006年1月。为了测量奥古斯丁火山2006年爆发前的地表变形,我们采用了卫星雷达干涉测量法,使用合成孔径雷达(SAR)图像从三个下降和三个上升的卫星轨道获得的欧洲遥感卫星(ERS)1和2和环境卫星(ENVISAT)。多个干涉图被堆叠以减少由大气条件引起的伪影,并且我们使用奇异值分解方法从岛上的几个点检索时间变形历史。1992年至2005年期间的干涉图显示,由于1986年喷发的火山碎屑流沉积物收缩,造成了每年约1-3厘米的下沉。沉降量随时间呈指数级下降。1992年至2005年的多幅干涉图显示,在2006年火山爆发之前,火山周围没有明显的通货膨胀。缺乏喷发前的变形信号表明,从1992年至2005年8月的变形信号必须是非常小的,可能已被大气延迟文物掩盖。
The Augustine Volcano is a conical-shaped, active stratovolcano located on an island of the same name in Cook Inlet, about 290 km southwest of Anchorage, Alaska. Augustine has experienced seven significant explosive eruptions-in 1812, 1883, 1908, 1935, 1963, 1976, 1986, and in January 2006. To measure the ground surface deformation of the Augustine Volcano before the 2006 eruption, we applied satellite radar interferometry using Synthetic Aperture Radar (SAR) images from three descending and three ascending satellite tracks acquired by European Remote Sensing Satellite (ERS) 1 and 2 and the Environment Satellite (ENVISAT). Multiple interferograms were stacked to reduce artifacts caused by atmospheric conditions, and we used a singular value decomposition method to retrieve the temporal deformation history from several points on the island. Interferograms during 1992 and 2005 show a subsidence of about 1-3 cm/year, caused by the contraction of pyroclastic flow deposits from the 1986 eruption. Subsidence has decreased exponentially with time. Multiple interferograms between 1992 and 2005 show no significant inflation around the volcano before the 2006 eruption. The lack of a pre-eruption deformation signal suggests that the deformation signal from 1992 to August 2005 must have been very small and may have been obscured by atmospheric delay artifacts.