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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >3D Attenuation Tomography of the Volcanic Island of Tenerife (Canary Islands)
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3D Attenuation Tomography of the Volcanic Island of Tenerife (Canary Islands)

机译：特内里费岛火山岛（加那利群岛）的3D衰减层析成像

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This paper shows a new multidisciplinary interpretation approach to the internal structure of Tenerife Island. The central core of this work is the determination of the three-dimensional attenuation structure of the region using P-waves and the coda normalization method. This study has been performed using 45,303 seismograms recorded at 85 seismic stations from an active experiment (air gun shots) conducted in January 2007. The interpretation of these new results is done combining the new images with previous studies performed in the area such as seismic velocity tomography, magnetic structure, magnetotelluric surveys or gravimetric models. Our new 3D images indicate the presence of seismic attenuation contrasts, with areas of high and low seismic attenuation patterns. High seismic attenuation zones are observed both in shallow and in deeper areas. The shallowest area of Las Caadas caldera complex (1-3 km thick) is dominated by high attenuation behavior, and it is interpreted as the combined effect of sedimentary and volcanoclastic deposits, multifracture systems and the presence of shallow aquifers. At the same time, the deeper analyzed area, more than 8 km below sea level, is dominated by a high attenuation pattern, and it is interpreted as the consequence of the effect of high-temperature rocks in the crustal-mantle boundary. This interpretation is compatible and confirmed by previous models that indicate the presence of underplating magma in this region. On the contrary, some low attenuation bodies and structures have been identified at different depths. A deep low attenuation central body is interpreted as the original central structure associated with the early stage of Tenerife Island. At shallower depths, some low attenuation bodies are compatible with old intermediate magmatic chambers postulated by petrological studies. Finally, in the north of the island (La Orotava valley) we can interpret the low attenuation structure as the headwall of this valley, supporting the idea that Las Caadas caldera and this valley resulted from two different destructive processes.
机译：本文展示了特内里费岛内部结构的一种新的多学科解释方法。这项工作的核心是使用P波和尾波归一化方法确定区域的三维衰减结构。这项研究是使用2007年1月进行的一项主动实验（气枪射击）在85个地震台站上记录的45,303幅地震图进行的。这些新结果的解释是将这些新图像与该地区以前的研究（例如地震速度）结合起来进行的层析成像，磁性结构，大地电磁测量或重力模型。我们的新3D图像指示了地震衰减对比的存在，以及地震衰减模式的高低区域。在浅层和较深区域都观察到高地震衰减带。 Las Caadas火山口复合体的最浅区域（1-3公里厚）主要表现为高衰减行为，这被解释为沉积和火山碎屑沉积，多重裂缝系统以及浅层含水层的综合作用。同时，更深的分析区域（低于海平面8 km）以高衰减模式为主，这被解释为地壳-地幔边界中高温岩石作用的结果。这种解释是兼容的，并被先前的模型所证实，这些模型表明了该地区存在岩浆底部。相反，已经在不同深度处识别出一些低衰减的物体和结构。一个深的低衰减中心体被解释为与特内里费岛早期有关的原始中心结构。在较浅的深度，一些低衰减的体与岩石学研究假设的旧中岩浆室兼容。最后，在岛的北部（奥罗塔瓦山谷），我们可以将低衰减结构解释为该山谷的顶壁，从而支持拉斯卡达斯火山口和该山谷是由两个不同的破坏过程造成的。

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