Three-dimensional resistivity modelling of grounded electrical-source airborne transient electromagnetic (GREATEM) survey data from the Nojima Fault, Awaji Island, south-east Japan

Allah, Sabry Abd; Mogi, Toru; Ito, Hisatoshi; Jymori, Akira; Yuuki, Youichi; Fomenko, Elena; Kiho, Kenzo; Kaieda, Hideshi; Suzuki, Koichi; Tsukuda, Kazuhiro

doi:10.1071/eg12086

Cited by 23 publications

(5 citation statements)

References 24 publications

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“…It was further developed by Elliott [1996] and Mogi et al [1998] with fixed-loop source and grounded electrical source, respectively. The S-ATEM system has been used for metal mineral exploration in arid area [Elliott, 1998], unreachable crater structure investigation [Mogi et al, 2009;Ito et al, 2014], coastal or shallow sea areas underground structure investigation [Ito et al, 2011;Abd Allah et al, 2013;Abd Allah et al, 2014], rugged terrain tunnel construction design [Okazaki et al, 2011], and achieved good survey results.…”

Section: Introductionmentioning

confidence: 99%

Application of grounded electrical source airborne TEM system in Changyi BIF deposit, Jiaodong Peninsula of eastern China

Liu

Zhang²,

Geng³

et al. 2018

Annals of Geophysics

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Semi-airborne transient electromagnetic (S-ATEM) method is a hybrid method which employs a grounded electrical or a loop source and an airborne receiver. It has greater investigation depth compared to the airborne electromagnetic method due to its higher transmitting power and more flexibility and efficiency compared to ground electromagnetic method due to its airborne receiving equipment. A new S-ATEM system based on unmanned helicopter is introduced. Besides some information on the technical specifications of the S-ATEM system and data processing technique, a case study of the investigation of Changyi banded iron formation deposit is illustrated. Within the survey area, the ground magnetic method has found a clear magnetic anomaly, whose location has a good correspondence with a ore-body. In order to investigate the underground electrical characteristics and reveal the relationship of ore-body location, subsurface magnetic field anomaly and underground resistivity distribution, a S-ATEM investigation was conducted in January 2016. During the survey, underground resistivity distribution from ground level to a depth of 400 was reconstructed and it was inferred that a strong granite intrusion in the middle of the survey area influenced the ore-body burial depth and magnetic distribution. Although the effect of intrusion on magnetic field is not as significant as that of the ore-body, the intrusion uplifted and deformed the ore-bearing strata, reducing the burial depth and changing the tilt angle, which indirectly affect the magnetic field distribution of the survey area.

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Section: Introductionmentioning

confidence: 99%

Application of grounded electrical source airborne TEM system in Changyi BIF deposit, Jiaodong Peninsula of eastern China

Liu

Zhang²,

Geng³

et al. 2018

Annals of Geophysics

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“…TEM 자료 해석의 여러 사례들을 분석해 보면, 3차원 TEM 자료의 역산이 과거에 비해 현실적으로 가능해져 지 표 기반 TEM 시스템 자료(Yang and Oldenburg, 2014; Zhang et al, 2021)나 항공 TEM 자료(Qi et al, 2020) 해석에 적용 되는 사례들이 증가하고 있다. 즉, 항공 탐사에서는 방대한 양의 자료를 측정하게 되므로, 계산 시간과 메모리의 한계 로 3차원 TEM 모델링 및 역산 기법에 대한 발전이 매우 느 렸지만(Macnae and Milkereit, 2007;Cox et al, 2012) 2010년대 이후로 컴퓨터 계산 능력의 발달과 수치해석 기 법의 발전으로 인해 최근 다시 연구가 활발히 이루어지고 있다(e.g.,Allah et al, 2014;Liu and Yin, 2016).…”

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A Review of the Time-domain Electromagnetic Method: Research Trends and Applications

Joung¹,

Cho

Kim

et al. 2022

J. Korean Soc. Miner. Energy Resour. Eng.

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Time-domain/transient electromagnetic (TEM) survey measures changes in the electromagnetic (EM) field with respect to time, after an artificially generated electric or magnetic field is discontinued. Therefore, only secondary magnetic fields are measured that are free from the primary magnetic fields. Theoretically, TEM measurements are frequency responses that provide information on the conductivities of shallow to deep sub-surfaces. TEM data, normally stacked, are corrected during data processing. TEM measurement responses for synthetic models can be numerically computed using the finite difference, finite element, and finite volume methods. In this review, initially we have discussed the basic theory of the TEM method and TEM survey systems by classifying them into loop and ground-wire transmitters. Subsequently, we discussed data processing, modelling, and inversion. Finally, we discussed field survey cases from various application fields by classifying them into land, marine, and airborne TEM systems.

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“…Practically, the depth of investigation depends on how long the clear transient curve is observed. If the transient is buried in the noise, we determine the end of clear transient and the depth of investigation is defined as the depth corresponding to the transient response time at which response data become difficult to fit to a theoretical curve because of scatter caused by noise (Abd Allah et al 2013a). Figure 5 shows a west-east cross section of the 1D resistivity structure (OYO 2014) along y = 5000 m (a), 6000 m (b) and 7000 m (c).…”

Section: Inversion Of Assumed Layer Structurementioning

confidence: 99%

“…To enhance the depth of exploration, we used a large-moment grounded electrical source as a transmitter and towed a magnetic sensor through the air as a receiver. The method increases the survey depth of penetration because it galvanically injects electric current into the ground using a large-moment source and a long transmitter-receiver distance (Abd Allah et al 2013a).…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional resistivity modeling of GREATEM survey data from Ontake Volcano, northwest Japan

Allah

Mogi

2016

Earth Planet Sp

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Ontake Volcano is located in central Japan, 200 km northwest of Tokyo and erupted on September 27, 2014. To study the structure of Ontake Volcano and discuss the process of its phreatic eruption, which can help in future eruptions mitigation, airborne electromagnetic (AEM) surveys using the grounded electrical-source airborne transient electromagnetic (GREATEM) system were conducted over Ontake Volcano. Field measurements and data analysis were done by OYO Company under the Sabo project managed by the Ministry of Land, Infrastructure, Transport and Tourism. Processed data and 1D resistivity models were provided by this project. We performed numerical forward modeling to generate a three-dimensional (3D) resistivity structure model that fits the GREATEM data where a composite of 1D resistivity models was used as the starting model. A 3D electromagnetic forward-modeling scheme based on a staggered-grid finite-difference method was modified and used to calculate the response of the 3D resistivity model along each survey line. We verified the model by examining the fit of magnetic-transient responses between the field data and 3D forward-model computed data. The preferred 3D resistivity models show that a moderately resistive structure (30-200 Ω m) is characteristic of most of the volcano, and were able to delineate a hydrothermal zone within the volcanic edifice. This hydrothermal zone may be caused by a previous large sector collapse.

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Three-dimensional resistivity modelling of grounded electrical-source airborne transient electromagnetic (GREATEM) survey data from the Nojima Fault, Awaji Island, south-east Japan

Cited by 23 publications

References 24 publications

Application of grounded electrical source airborne TEM system in Changyi BIF deposit, Jiaodong Peninsula of eastern China

Application of grounded electrical source airborne TEM system in Changyi BIF deposit, Jiaodong Peninsula of eastern China

A Review of the Time-domain Electromagnetic Method: Research Trends and Applications

Three-dimensional resistivity modeling of GREATEM survey data from Ontake Volcano, northwest Japan

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