Analysis of Magnetotelluric Response Functions at the Cam Thuy Site, Northern Vietnam

IF 0.9 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Izvestiya, Physics of the Solid Earth Pub Date : 2024-07-11 DOI:10.1134/S1069351324700332

S. S. Starzhinskii

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Abstract—During the magnetotelluric studies in North Vietnam, simultaneous Phase Roll Out from Quadrant effect was detected in the behavior of impedance phases Z_xy and Z_yx at one of the sounding sites, CTH, in the Cam Thuy district, Thanh Hoa province. The investigation of this phenomenon has shown that it is accompanied by negative (directed upwards) components of the Umov–Poynting vector of electromagnetic energy flux in the entire range of the recorded periods of magnetotelluric variations. This energy flux direction remains unchanged when the initial coordinate system is rotated by angles of 45° and 60°. Another characteristic feature of this phenomenon is an unusual behavior of the apparent resistivity curves: the apparent resistivity magnitudes increase starting from a period of 200 s up to a period of 10⁴ s, and this increase occurs practically along the asymptote. The analysis of the magnetotelluric field polarization and phase tensor asymmetry parameter (skew angle) β has shown that the section is characterized by significant three-dimensional (3D) distortions which manifest themselves by β values ranging between 20° and 90°.

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越南北部 Cam Thuy 遗址的磁位响应函数分析

摘要--在对越南北部进行磁电研究期间，在清化省 Cam Thuy 地区的一个探测点 CTH 的阻抗相位 Zxy 和 Zyx 的行为中发现了同时出现的象限相位滚出效应。对这一现象的研究表明，在记录的整个磁极变化周期范围内，电磁能量通量的 Umov-Poynting 矢量都伴有负分量（方向向上）。当初始坐标系旋转 45° 和 60° 时，这种能量通量方向保持不变。这一现象的另一个特点是视电阻率曲线的异常行为：视电阻率大小从 200 秒周期开始增加到 104 秒周期，而且这种增加实际上是沿着渐近线发生的。对磁场极化和相位张量不对称参数（倾斜角）β 的分析表明，该断面具有明显的三维（3D）畸变特征，β 值在 20° 至 90° 之间。

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来源期刊

Izvestiya, Physics of the Solid Earth 地学-地球化学与地球物理

CiteScore

1.60

自引率

30.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Izvestiya, Physics of the Solid Earth is an international peer reviewed journal that publishes results of original theoretical and experimental research in relevant areas of the physics of the Earth''s interior and applied geophysics. The journal welcomes manuscripts from all countries in the English or Russian language.