Electrotomography Studies in the Uzon Caldera at Shaman Geyser (Kamchatka Peninsula)

IF 0.9 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Russian Journal of Pacific Geology Pub Date : 2024-08-25 DOI:10.1134/s1819714024700192

I. N. Modin, A. D. Skobelev, A. M. Valiulina, V. S. Stepchenkov

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Abstract

In 2020, in the caldera of Uzon volcano (Kamchatka Peninsula), electrical prospecting studies were carried out using the electrotomography method within the eastern thermal field near Shaman geyser. The geoelectric section is divided into three zones according to the level of electrical resistivity: relatively high-resistivity cold zones at the edges and a relatively low-resistivity hot zone in the center. The hot zone, situated at a depth of 5–20 m and hosting the Shaman geyser, is distinguished by anomalously low resistivity (less than 0.5 Ω m), which indicates the highest fracturing and saturation of rocks with fluid. Resistivity monitoring was carried out above the geyser using an Omega-48 electrical tomography station and two cables with lengths of 235 and 47 m. The first cable provided a survey depth of 60 m; the second, ∼12 m. Four phases of the geyser’s operation are distinguished on the difference geoelectric sections, constructed from the monitoring results: filling, outpouring, spouting, and steaming in the form of alternating positive and negative electric field anomalies. The channel to the geyser was found from the results of areal measurements.

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在萨满间歇泉（堪察加半岛）的乌孙破火山口进行的电图研究

摘要 2020 年，在乌尊火山（堪察加半岛）的火山口，使用电旋转造影法对沙曼间歇泉附近的东部热田进行了电勘探研究。地电剖面根据电阻率水平分为三个区域：边缘为电阻率相对较高的冷区，中心为电阻率相对较低的热区。热区位于 5-20 米深处，是沙曼间歇泉的所在地，其特点是电阻率异常低（小于 0.5 Ω 米），这表明岩石断裂和流体饱和度最高。根据监测结果绘制的差异地电剖面图显示，间歇泉的运行分为四个阶段：充填、喷涌、喷出和蒸腾，表现为正负电场异常交替出现。间歇泉的通道是根据测量结果确定的。

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来源期刊

Russian Journal of Pacific Geology 地学-地球科学综合

CiteScore

1.30

自引率

37.50%

发文量

审稿时长

>12 weeks

期刊介绍： Russian Journal of Pacific Geology publishes the results of research on the Earth crust and mantle composition and provides articles on the geological structure and patterns of distribution of mineral deposits in the Pacific Ocean, marginal seas and continental margins. It discusses the topics of stratigraphy, sedimentology, magmatic activity, and seismicity. The journal deals with the problems of lithosphere plates tectonics, and offers the results of neotectonic, geomorphological, geodesic, environmental and mining studies in the Pacific region. The journal accepts theoretical, methodical and philosophical articles covering general issues of geology, geophysics, geochemistry, geoecology and mining. The journal also publishes critical notes and comments, and reviews.