Detalied magnetotelluric study of the northern part of Subandean fold belt, Bolivia

Palshin, N. A.; Giraudo, R.; Yakovlev, D. V.; Zaytsev, Sergey V.; Aleksanova, E.D.; Zaltsman, Roman; Korbutiak, Sergey

doi:10.1016/j.jappgeo.2020.104136

Cited by 8 publications

(3 citation statements)

References 22 publications

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“…As for the last record from the "red" list of Table 2, we have no a priori information about the presence of power lines or other overhead metallic constructions in the survey area, but the latter is known to be relatively flat, so a reasonable geological explanation for an elevated conducting body could hardly exist anyway. The obtained results show that application of the above search algorithm to the whole onshore MT/ BBMT database of Nord-West Ltd., which includes thousands of records taken in complex geological conditions and extremely rugged topography (e.g., those acquired in Sub-Andean fold belt-see Palshin et al 2020) has not yield a single impedance tensor, which could be confidently regarded as being non-causal due to geological reasons. This allows concluding that, though the potential existence of non-causal impedances (and hence magnetic tensors, tippers and any other transfer functions formally treating the horizontal magnetic field as an input-see Part I) on the land surface should not be excluded completely, the actual chance to encounter such data in practice is negligible.…”

Section: Land Mt Explorationmentioning

confidence: 99%

Validity of the dispersion relations in magnetotellurics. Part II: synthetic and field data

Zorin

Алексеев

Epishkin³

et al. 2020

Earth Planets Space

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The impedance tensor and tipper are shown to be non-causal in some classes of 2-D and 3-D magnetotelluric (MT) models, including those widely encountered off shore. At the same time, examination of a large database of onshore MT records yields only a handful of non-causal tensors, being non-causal due to the influence of nearby artificial conductors rather than some exotic geological conditions. This result implies that the actual chance to encounter a non-causal impedance tensor or tipper in terrestrial MT exploration is vanishingly small, thus securing the universal applicability of the dispersion relation technique for quality assessment of the mentioned transfer functions.

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Section: Land Mt Explorationmentioning

confidence: 99%

Validity of the dispersion relations in magnetotellurics. Part II: synthetic and field data

Zorin

Алексеев

Epishkin³

et al. 2020

Earth Planets Space

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“…Usually, MTS is used in applied geophysics for prospecting and deep investigations of the sedimentary cover and consolidated crust for large areas [20] and for other environmental purposes. The modern MTS application is close to studying tectonic disturbances in rock masses.…”

Section: Introductionmentioning

confidence: 99%

The joint seismic-and-electromagnetic monitoring with electromagnetic field separation

Рыбин¹,

Непеина²

2023

E3S Web Conf.

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The magnetotelluric soundings (MTS) are a common tool in applied geophysics. The guidelines for electromagnetic (EM) monitoring should be updated because of new tools and software developed. Some techniques paragraphs have outdated sections. Some essential equipment requirements and its’ allowable parameters, MTS acquisition, are defined. We involve Research Station RAS patents (RU 175972 U1, 2017; RU 2701876 C1, 2018) to increase the long-term stability of electrical parameters of non-polarizable electrodes. We consider the irreversible rock deformations form sources of the electromagnetic field of endogenous origin as geodynamic processes. We offer MTS with an additional algorithm with electromagnetic field separation for studying the endogenous component of EM field as a lower half-space impedance. We explain the technology of MTS in seismically active zones with remote access on the example of the Tien Shan. We introduce these guidelines acquiring data system for the joint seismic-and-electromagnetic monitoring for the modern geodynamic processes. We show a result diagram for the energy characteristic of the endogenous component of EM field.

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“…The MT method has relatively good accuracy in predicting the depth and thickness of the subsurface layers, including the underlying basement and possibly structures that are generally more difficult to identify. The MT method can resolve complex structures in volcanic or limestone-covered and overthrust belt areas, where the seismic method is problematic (Patro, 2020;Xu et al, 2020;Palshin et al, 2020). The MT 2D modeling results are interpreted to infer the subsurface geology of the study area, more particularly to delineate layer boundaries and the basement based on the resistivity models.…”

Section: Introductionmentioning

confidence: 99%

Magnetotellurics study of Atambua area, West Timor, Indonesia

Wijanarko

Arisbaya

Sumintadireja

et al. 2022

Vietnam J. Earth Sci.

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Timor Island, located in the eastern Indonesian archipelago, has a complex tectonic evolution causing complex geological structures. Many hypothetical tectonic models are proposed mainly based on regional geological and geophysical data. Available geophysical data to support geological study at a more detailed scale are still very limited. Therefore, this study aimed to map the sub-regional subsurface geology in Atambua, West Timor, and its surroundings by using the magnetotelluric (MT) method. The estimated geo-electrical strike direction from the phase tensor analysis confirmed the regional Southwest - Northeast general structural orientation. The dimensionality analysis also showed the validity for 2D approximation in that direction. The subsurface resistivity models from 2D inversion of the MT data at representative lines perpendicular to the regional structural direction delineate the primary sequences and their boundaries from their resistivities. They are, from top to bottom, Viqueque and Bobonaro sequences, Kolbano sequence, Kekneno sequence, and the basement dominated by rocks with Australian affinity. These main rock formations represent the regional sedimentary depositional fill resulting from the major tectonic events on Timor Island.

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Detalied magnetotelluric study of the northern part of Subandean fold belt, Bolivia

Cited by 8 publications

References 22 publications

Validity of the dispersion relations in magnetotellurics. Part II: synthetic and field data

Validity of the dispersion relations in magnetotellurics. Part II: synthetic and field data

The joint seismic-and-electromagnetic monitoring with electromagnetic field separation

Magnetotellurics study of Atambua area, West Timor, Indonesia

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