Geophysical Investigation of Mount Nemrut Stratovolcano (Bitlis, Eastern Turkey) Through Aeromagnetic Anomaly Analyses

Ekinci, Yunus Levent; Büyüksaraç, Aydın; Bektaș, Özcan; Ertekin, Can

doi:10.1007/s00024-020-02432-0

Cited by 23 publications

(9 citation statements)

References 75 publications

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“…The global solution is always necessary to interpret any geophysical data [1,29,97]. Hence, the procedure developed by [98,99] is used for the present study.…”

Section: Inversionmentioning

confidence: 99%

“…Geophysical exploration employing magnetic data helps study the subsurface properties by measuring the variation of the geomagnetic field primarily caused due to the presence of mineral bodies and different geological structures [1]. Such variation of magnetic field intensity formed due to contrast of magnetic susceptibility between the host rocks and the target mineralized bodies or the structures and can be used to limit the depth, location, orientation, geometry, and magnetic moment of the subsurface structure [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Interpretation of Magnetic Anomalies over 2D Fault and Sheet-Type Mineralized Structures Using Very Fast Simulated Annealing Global Optimization: An Understanding of Uncertainty and Geological Implications

Biswas

Rao

2021

Lithosphere

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Identification of intraterrane dislocation zones and associated mineralized bodies is of immense importance in exploration geophysics. Understanding such structures from geophysical anomalies is challenging and cumbersome. In the present study, we present a fast and competent algorithm for interpreting magnetic anomalies from such dislocation and mineralized zones. Such dislocation and mineralized zones are well explained from 2D fault and sheet-type structures. The different parameters from 2D fault and sheet-type structures such as the intensity of magnetization (k), depth to the top (z1), depth to the bottom (z2), origin location (x0), and dip angle (θ) of the fault and sheet from magnetic anomalies are interpreted. The interpretation suggests that there is uncertainty in defining the model parameters z1 and z2 for the 2D inclined fault; k, z1, and z2 for the 2D vertical fault and finite sheet-type structure; and k and z for the infinite sheet-type structure. Here, it shows a wide range of solutions depicting an equivalent model with smaller misfits. However, the final interpreted mean model is close to the actual model with the least uncertainty. Histograms and crossplots for 2D fault and sheet-type structures also reveal the same. The present algorithm is demonstrated with four theoretical models, including the effect of noises. Furthermore, the investigation of magnetic data was also applied from three field examples from intraterrane dislocation zones (Australia), deep-seated dislocation zones (India) as a 2D fault plane, and mineralized zones (Canada) as sheet-type structures. The final estimated model parameters are in good agreement with the earlier methods applied for these field examples with a priori information wherever available in the literature. However, the present method can simultaneously interpret all model parameters without a priori information.

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“…The global solution is always necessary to interpret any geophysical data [1,29,97]. Hence, the procedure developed by [98,99] is used for the present study.…”

Section: Inversionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interpretation of Magnetic Anomalies over 2D Fault and Sheet-Type Mineralized Structures Using Very Fast Simulated Annealing Global Optimization: An Understanding of Uncertainty and Geological Implications

Biswas

Rao

2021

Lithosphere

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“…Seismogenic zone 6 covers the NW-SE striking Erzincan basin which appears to be a major step over along the NAFZ (Şengör, 1979;Hubert-Ferrari et al, 2002). The largest events in this seismogenic Okay and Tüysüz, 1999;Yiğitbaş et al, 2004;USGS, 2010;Ekinci et al, 2020Ekinci et al, , 2021Işık et al, 2020 We used instrumental (M S ≥ 5.5, until the end of 2019) and historical data with maximum intensities of I 0 ≥ 9.0 corresponding to surface wave magnitude M S ≥ 7.0 (Sayıl, 2013). Different-scaled magnitudes were transformed to M S using empirical equations obtained from regional earthquakes (Figure 3).…”

Section: Rtimap Modelmentioning

confidence: 99%

“…Figure 1. Tectonic map of Turkey and the surrounding (compiled withOkay and Tüysüz, 1999;Yiğitbaş et al, 2004; USGS, 2010;Ekinci et al, 2020Ekinci et al, , 2021Işık et al, 2020). NAFZ, North Anatolian Fault Zone; EAFZ, East Anatolian Fault Zone; NEAFZ, Northeast Anatolian Fault Zone; BZSZ, Bitlis-Zagros Suture Zone; DSFZ, Dead Sea Fault Zone; WAGS, West Anatolian Graben System; SBST, Southern Black Sea Thrust.…”

mentioning

confidence: 99%

Time-dependent model for earthquake occurrence and effects of design spectra on structural performance: a case study from the North Anatolian Fault Zone, Turkey

Işık¹,

Ekinci²,

Sayıl³

et al. 2021

Turkish J Earth Sci

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We have investigated the time-dependent seismicity model of the earthquake occurrence on a regional basis through the North Anatolian Fault Zone (NAFZ). To that end, the studied region has been subdivided into 7 seismogenic zones considering the seismotectonic criteria, and then regional time and magnitude predictable (RTIMAP) model has been performed. Intervened times and magnitudes of main shocks produced in each zone have predictive properties defined by the RTIMAP. The probabilities of the next main shocks in 5 decades and the magnitudes of the next events have been estimated using the formation time and magnitude of the past events in the zones. In the second step of the study, we have considered 17 settlements located on the NAFZ to perform point-based site-specific seismic hazard analyses and to determine the design spectra and earthquake parameters using updated Turkish Earthquake Hazard Map. Eigen value and static adaptive pushover analyses have been applied for the sample reinforced concrete building using the design spectra obtained from each settlement. This sample building has been modelled with the same structural characteristics (i.e. material strength, column and beams, applied loads, etc.) for all of the settlements. We have determined that the earthquake building parameters differ from each other which indicates the significance of site-specific seismicity characteristics on the building performance.

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“…Aeromagnetic exploration is generally used in geological research, mineral exploitation, and underground unexploded ordnance detection (Ekinci et al, 2020;Beamish and White, 2011;Doll et al, 2012). Since the magnetic field generated by the ferromagnetic material and metal-cutting geomagnetic wires on the aircraft platform will interfere with the magnetic detector, it will affect the quality of aeromagnetic survey data.…”

Section: Introductionmentioning

confidence: 99%

Analysis and reduction of the geomagnetic gradient influence on aeromagnetic compensation in a towed bird

Zhou

Liu

et al. 2021

Geosci. Instrum. Method. Data Syst.

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Abstract. Aeromagnetic exploration is an important method of geophysical exploration. We study the compensation method of the towed bird system and establish the towed bird interference model. Due to the geomagnetic gradient changing greatly, the geomagnetic gradient is considered in the towed bird interference model. In this paper, we model the geomagnetic field gradient and analyze the influence of the towed bird system on the aeromagnetic compensation results. Finally, we apply the ridge regression method to solve the problem. We verify the feasibility of this compensation method through actual flight tests and further improve the data quality of the towed bird interference.

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Geophysical Investigation of Mount Nemrut Stratovolcano (Bitlis, Eastern Turkey) Through Aeromagnetic Anomaly Analyses

Cited by 23 publications

References 75 publications

Interpretation of Magnetic Anomalies over 2D Fault and Sheet-Type Mineralized Structures Using Very Fast Simulated Annealing Global Optimization: An Understanding of Uncertainty and Geological Implications

Interpretation of Magnetic Anomalies over 2D Fault and Sheet-Type Mineralized Structures Using Very Fast Simulated Annealing Global Optimization: An Understanding of Uncertainty and Geological Implications

Time-dependent model for earthquake occurrence and effects of design spectra on structural performance: a case study from the North Anatolian Fault Zone, Turkey

Analysis and reduction of the geomagnetic gradient influence on aeromagnetic compensation in a towed bird

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