Deformation of Stromboli Volcano (Italy) during the 2007 eruption revealed by radar interferometry, numerical modelling and structural geological field data
Deformation of Stromboli Volcano (Italy) during the 2007 eruption revealed by radar interferometry, numerical modelling and structural geological field data
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DOI：
10.1016/j.jvolgeores.2009.01.002
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发表时间：
2009-05-10
影响因子：
2.9
通讯作者：
Tarchi, Dario
中科院分区：
文献类型：
--
作者：
Casagli, Nicola;Tibaldi, Alessandro;Tarchi, Dario
斯特龙博利火山的活动特点是非常低的能量爆炸，每10-15分钟发生一次，将火山口边缘以上的熔岩抛出。2007年期间，该火山出现异常活动，形成了新的喷发口（2月27日和3月9日），3月15日发生了一次大爆炸。本文介绍了一个综合研究的基础上，结构地质实地调查，干涉雷达监测和数值模拟的火山（Sciara del Fuoco - SdF）的上西北侧的变形。在2007年事件期间进行的实地调查显示，主要是东北走向的裂缝和断裂的发展上SdF的北方的一部分在2007年1月，地面合成孔径雷达（GB-InSAR），安装在侧面的SdF，显示了一个渐进的加速运动的NE火山口之前，爆发的2007年2月27日。到2月上半月，SdF的上部也出现了加速，2月27日，随着新的喷口的打开和变形率高于雷达设备的测量能力，火山开始喷发。2007年3月8日至9日，GB-InSAR突出显示了在另一个喷口打开之前，在SdF的西北部形成了一个凸起。为了了解喷发过程中记录的变形模式，使用FLAC 3D代码进行了数值模拟。根据所有数据的整合，在喷出前阶段（2月27日之前）观察到的变形似乎与SW-NE走向的岩墙的侵入有关。相反，在3月9日通风口打开之前记录的膨胀与一个近水平岩床的侵入有关。(C)2009 Elsevier B. V.保留所有权利。
The activity of Stromboli volcano is characterized by very low energy explosions, occurring every 10-15 min, throwing out lava above the crater rim. During 2007, the volcano showed an anomalous activity in which new effusive vents developed (27 February and 9 March) and a major explosion took place on 15 March. This paper presents an integrated study based on a structural geological field survey, interferometric radar monitoring and numerical modelling on the deformations of the upper NW flank of the volcano (Sciara del Fuoco - SdF). The field survey carried out during the 2007 events shows the development of mainly NE-striking fissures and fractures on the northern part of the upper SdF In January 2007, the ground-based synthetic aperture radar (GB-InSAR), installed on the flank of the SdF, showed a progressive acceleration of movement on the NE crater preceding the eruption of 27 February 2007. By the first half of February, the acceleration also involved the upper portion of the SdF and on 27 February the eruption started with the opening of new vents and deformation rates higher than the measurement capability of the radar device. On 8-9 March 2007, the GB-InSAR highlighted the formation of a bulge on the NW sector of the SdF, preceding the opening of an additional vent. To understand the deformation pattern recorded during the eruption, a numerical simulation was carried out by using the FLAC 3D code. Based on the integration of all the data, the deformations observed in the pre-effusive phase (before 27 February) seem to be related to the intrusion of a SW-NE striking dyke. The bulging recorded before the 9 March vent opening is instead to be associated with the intrusion of a sub-horizontal sill. (C) 2009 Elsevier B.V. All rights reserved.