亚速尔群岛福戈火山磁突触数据的三维解读

IF 2.4 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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引用次数: 0

摘要

通过对 44 个磁电探测结果进行三维反演,确定了福戈火山和圣米格尔岛地震活跃的 Congro 地区的电阻率结构,从而对该火山岛的内部结构有了新的认识。在对处理代码进行全面测试,以便从收集到的时间序列中获得最佳磁电探测响应之后,获得了一个强大的电阻率模型。对反演过程中的各种特征进行了敏感性分析,以确定其可靠性,并帮助进行地质解释。磁强辐射数据对福戈火山北翼的大里贝拉地热系统进行了成像,并提供了新的结构见解,其中浅层低电阻率(1 - 5Ωm)区域与钻孔数据具有很强的相关性,并被证明是绘制温度和粘土蚀变矿物学的极佳替代物。在福戈火山中心建筑物下方以及整个 Congro 地区,地质电阻率很高,但新的磁电探测结果没有进一步说明地震的起源,而地震对居住在这个危险岛屿上的当地居民造成了威胁。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Three-dimensional interpretation of magnetotelluric data at Fogo Volcano, Azores Islands
The resistivity structure of Fogo volcano and the seismically active Congro region of São Miguel Island has been determined by 3-D inversion from 44 magnetotelluric soundings to yield new insights into the internal architecture of this volcanic island. Following comprehensive testing of processing codes to yield optimum magnetotelluric responses from the collected time-series, a robust electrical resistivity model was obtained. Sensitivity analysis of various features from the inversion process was used to determine their reliability, and aid geological interpretation. The magnetotelluric data imaged, and provided new structural insights into the Ribeira Grande geothermal system on the northern flank of Fogo volcano, where a shallow low resistivity (1 - 5Ωm) region has strong correlation with borehole data, and is shown to be an excellent proxy for mapping temperature and clay alteration mineralogy. Beneath the central edifice of Fogo volcano and also throughout the Congro region, the geology is very resistive, however the new magnetotelluric observations do not yield any further constraints on the origin of the seismicity that poses threats to the local populations residing on this hazardous island.
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来源期刊
CiteScore
5.90
自引率
13.80%
发文量
183
审稿时长
19.7 weeks
期刊介绍: An international research journal with focus on volcanic and geothermal processes and their impact on the environment and society. Submission of papers covering the following aspects of volcanology and geothermal research are encouraged: (1) Geological aspects of volcanic systems: volcano stratigraphy, structure and tectonic influence; eruptive history; evolution of volcanic landforms; eruption style and progress; dispersal patterns of lava and ash; analysis of real-time eruption observations. (2) Geochemical and petrological aspects of volcanic rocks: magma genesis and evolution; crystallization; volatile compositions, solubility, and degassing; volcanic petrography and textural analysis. (3) Hydrology, geochemistry and measurement of volcanic and hydrothermal fluids: volcanic gas emissions; fumaroles and springs; crater lakes; hydrothermal mineralization. (4) Geophysical aspects of volcanic systems: physical properties of volcanic rocks and magmas; heat flow studies; volcano seismology, geodesy and remote sensing. (5) Computational modeling and experimental simulation of magmatic and hydrothermal processes: eruption dynamics; magma transport and storage; plume dynamics and ash dispersal; lava flow dynamics; hydrothermal fluid flow; thermodynamics of aqueous fluids and melts. (6) Volcano hazard and risk research: hazard zonation methodology, development of forecasting tools; assessment techniques for vulnerability and impact.
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