Surface deformation time series and source modeling for a volcanic complex system based on satellite wide swath and image mode interferometry: The Lazufre system, central Andes
Surface deformation time series and source modeling for a volcanic complex system based on satellite wide swath and image mode interferometry: The Lazufre system, central Andes
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DOI：
10.1016/j.rse.2009.05.004
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发表时间：
2009-10-01
影响因子：
13.5
通讯作者：
Oncken, Onno
中科院分区：
文献类型：
--
作者：
Anderssohn, Jan;Motagh, Mahdi;Oncken, Onno
潜在危险火山地区地球表面变形的时空尺度变化给观测和评估带来了挑战。在这里，我们使用分别从上升和下降几何形状的宽幅模式 (WSM) 和图像模式 (IM) 获取的 Envisat 数据来研究智利和阿根廷拉祖弗雷火山系统随时间变化的地面隆起。对 2003 年至 2008 年期间的 65 张 IM 干涉图进行了最小二乘调整。我们获得了在这 5 年间隔内达到 15-16 厘米的明显抬升趋势。使用上升和下降干涉图的联合反演。我们评估了拉祖弗雷火山系统下方水平延伸的加压源的几何形状和随时间变化的进展。因此，我们的结果表明，深度在 10 至 15 kin 之间的延伸岩浆体将造成大部分地面隆起。2003 年至 2008 年期间，最大膨胀达到 -40 厘米。在观测期间，侵入的横向传播速度估计几乎恒定在 5-10 公里/年，这对于物理理解岩浆侵入过程具有重要意义。 (C) 2009 Elsevier Inc. 保留所有权利。
The variable spatio-temporal scales of Earth's surface deformation in potentially hazardous volcanic areas pose a challenge for observation and assessment. Here we used Envisat data acquired in Wide Swath Mode (WSM) and Image Mode (IM) from ascending and descending geometry, respectively, to study time-dependent ground uplift at the Lazufre volcanic system in Chile and Argentina. A least-squares adjustment was performed on 65 IM interferograms that covered the time period of 2003-2008. We obtained a clear trend of uplift reaching 15-16 cm in this 5-year interval. Using a joint inversion of ascending and descending interferograms. we evaluated the geometry and time-dependent progression of a horizontally extended pressurized source beneath the Lazufre volcanic system. Our results hence indicate that an extended magma body at a depth between 10 and 15 kin would account for most of the ground uplift The maximum inflation reached up to -40 cm during 2003-2008. The lateral propagation velocity of the intrusion was estimated to be nearly constant at 5-10 km/yr during the observation time, which has important implications for the physical understanding of magma intrusion processes. (C) 2009 Elsevier Inc. All rights reserved.