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首页> 外文期刊>Geophysical Research Letters >Three-dimensional resistivity tomography of Vulcan's forge, Vulcano Island, southern Italy
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Three-dimensional resistivity tomography of Vulcan's forge, Vulcano Island, southern Italy

机译：意大利南部伏尔卡诺岛的伏尔肯熔炉的三维电阻率层析成像

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摘要

9,525 DC resistivity measurements were taken along 9 profiles crossing the volcanic edifice of La Fossa di Vulcano (the forge of God Vulcan in ancient Roman mythology), Vulcano Island (Italy) using a total of 958 electrode locations. This unique data set has been inverted in 3D by minimizing the L _2 norm of the data misfit using a Gauss-Newton approach. The true 3D inversion was performed using parallel processing on an unstructured tetrahedral mesh containing 75,549 finite-element nodes and 398,208 elements to accurately model the topography of the volcanic edifice. The 3D tomogram shows a very conductive body (>0.1 S/m) comprised inside the Pietre Cotte crater with conductive volumes that are consistent with the position of temperature and CO_2 anomalies at the ground surface. This conductive body is interpreted as the main hydrothermal body. It is overlaid by a resistive and cold cap in the bottom of the crater. The position of the conductive body is consistent with the deformation source responsible for the observed 1990-1996 deflation of the volcano associated with a decrease of hydrothermal activity.
机译：沿着总共958个电极位置，沿着Vulcano岛（意大利古罗马神话中的Vulcan神的熔炉）的La Fossa di Vulcano（古沃尔坎神的熔炉）的火山大厦横穿9个剖面，进行了9,525个直流电阻率测量。通过使用Gauss-Newton方法使数据不匹配的L _2范数最小化，已将该独特的数据集转换为3D格式。真正的3D反演是在包含75,549个有限元节点和398,208个元素的非结构化四面体网格上使用并行处理进行的，以准确地模拟火山大厦的地形。 3D断层图显示了Pietre Cotte陨石坑内部的一个非常导电的物体（> 0.1 S / m），其导电体积与地表温度和CO_2异常的位置一致。该导电体被解释为主要的水热体。它由火山口底部的电阻性冷帽覆盖。导电体的位置与形变源一致，该形变源负责观察到的1990-1996年与水热活动减少有关的火山放气。

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