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首页> 外文期刊>Earth, planets and space: EPS >Two-dimensional resistivity structure of Unzen Volcano revealed by AMT and MT surveys
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Two-dimensional resistivity structure of Unzen Volcano revealed by AMT and MT surveys

机译：AMT和MT测量揭示云仙火山的二维电阻率结构

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AMT and MT surveys were conducted to investigate at high resolution the spatial resistivity structure of Unzen volcano, with consideration given to understanding its regional dimensionality. Our phase tensor analysis supports the conclusion that the resistivity structure is two-dimensional, with the strike in the E-W direction. Two-dimensional inversions suggest that Unzen volcano is likely to comprise 4 layers: a high resistivity surface (greater than 1000 Ωm), an intermediate second layer (20 to several hundreds of fim), a low resistivity third layer (less than 20 Ω m), and a relatively high resistivity basement. We assume the upper-most high resistivity layer consists of undersaturated lava and pyroclastic flow deposits. The second and third layers are likely to be water-saturated and form an aquifer that seems to correlate well with the emergence of groundwater discharge at the surface. In deeper areas beneath the summit, a region with a resistivity of 20-80 Ω m is surrounded by areas of extremely low resistivity (less than 3 Ωm); this structural features in Unzen volcano was first identified in this study, but is typical of the resistivity structure observed in active volcanoes. Interpreting the results of well logs and geodetic studies of Unzen volcano in light of the findings of the present study and the resistivity structure of other active volcanoes, we suggest that Unzen volcano possesses a hydrothermal system of high-temperature fluids beneath its edifice; this hydrothermal system may play a non-negligible role in controlling heat and mass transfer in the magmatic system of Unzen volcano.
机译：进行了AMT和MT调查，以高分辨率方式研究了云仙火山的空间电阻率结构，同时考虑了了解其区域维度。我们的相张量分析支持以下结论：电阻率结构是二维的，走向在E-W方向。二维反演表明云仙火山可能包括4个层：高电阻率的表面（大于1000Ωm），第二中间层（20至数百微米），低电阻率的第三层（小于20Ωm）。 ）和较高电阻率的地下室。我们假设最高电阻率层由不饱和熔岩和火山碎屑流沉积物组成。第二层和第三层很可能是水饱和的，并形成一个含水层，似乎与地表地下水的涌现密切相关。在山顶下方的较深区域，电阻率极低（小于3Ωm）的区域包围着电阻率为20-80Ωm的区域。在这项研究中首先确定了云仙火山的这种结构特征，但它是在活火山中观察到的电阻率结构的典型特征。根据目前的研究结果和其他活火山的电阻率结构，对云岑火山的测井结果和大地测量研究进行解释，我们认为云岑火山在其建筑物下方拥有高温流体的热液系统。这个热液系统在控制云仙火山岩浆系统的传热和传质方面起着不可忽略的作用。

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