Investigating karst collapse geohazards using magnetotellurics: A case study of M'rara basin, Algerian Sahara

Foudili, Djabir; Bouzid, Abderrezak; Berguig, Mohamed Chérif; Bougchiche, Said Sofiane; Abtout, Abdeslam; Guemache, Mehdi Amine

doi:10.1016/j.jappgeo.2018.11.011

Cited by 8 publications

(2 citation statements)

References 37 publications

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“…Researchers have also used Magnetotelluric (MT) surveys to identify subsurface dry fracture networks and caves beneath synclines resulting from subsurface karst decay [10]. Moreover, studies have examined shallow and deep structures, as well as the understanding of collapse and cracking due to karst dissolution processes [11].…”

Section: Introductionmentioning

confidence: 99%

Investigating Land Use and Karst Disaster Mitigation through Geoelectric and Magnetotelluric Methods: A Case Study in Sendang Biru, Malang, Indonesia

Wahid,

Susilo,

Sianturi

et al. 2023

IJDNE

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offers significant tourism and fisheries potential, supported by the nearby Sempu Island Nature Reserve and a Fish Auction Site (FAS). However, the coastal region is prone to karstification, which may be exacerbated by recent land use developments in the surrounding area. This study aims to analyze the rock layer structures and assess the vulnerability of karst land use to the ongoing karstification process. Electrical Resistivity Tomography (ERT) and Magnetotelluric (MT) methods were employed to investigate karst land within the study area. The findings revealed the presence of karst aquifers in Zone A, extending to a depth of 250 m, characterized by low resistivity values. In Zone B, karst limestone deformation was observed at several locations due to karstification, with moderate resistivity values detected at a depth of 300 m on the surface, indicating vulnerability to karst disasters. High resistivity values dominated areas with massive karst limestone, ranging from the surface to a depth of 400 m. Furthermore, it was found that a significant portion of karst land is utilized for settlements, plantations, and rice paddies, potentially disrupting the karst ecosystem due to household, plantation, and agricultural waste. This study highlights the importance of understanding the impact of land use on karst vulnerability and informs mitigation strategies for sustainable development in the Sendang Biru region.

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Section: Introductionmentioning

confidence: 99%

Investigating Land Use and Karst Disaster Mitigation through Geoelectric and Magnetotelluric Methods: A Case Study in Sendang Biru, Malang, Indonesia

Wahid,

Susilo,

Sianturi

et al. 2023

IJDNE

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“…Three-dimensional geological modeling using resistivity tomography (ERT) data can describe the spatial characteristics of underground karst and has been successfully applied in the Lascaux area (France) [7]. In Algeria, the geological hazards of karst collapse in the Sahara Basin were investigated by using magnetotelluric three-dimensional inversion technology [8]. Seismic wave CT (computerized tomography) technology was used to detect the fine structure of karst in the Shenzhen (China) Metro Line 14 [9], but there is a high requirement for the spacing between boreholes in CT technology.…”

Section: Introductionmentioning

confidence: 99%

Multi-Mode Imaging of Ambient Background Noise for Karst Detection in the Limestone Area Based on Frequency-Bessel Transform

et al. 2023

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In response to the challenges of karst geophysical exploration in an environment with strong external interference, this paper proposes a new method, namely the frequency-Bessel transform method, for extracting multi-order dispersion curves of surface waves from background noise to characterize karst. The observation noise data of the Wuhan karst development area are used as an example, where the dolomitic limestone and limestone mixed with dolomite of the Jialing River Formation of the middle lower Triassic are widely developed in the observation area. The frequency-Bessel transform method involves performing a Bessel integral transformation on the cross-correlation coefficient of background noise in the frequency domain. Firstly, by synthesizing theoretical noise data and comparing it with the spatial autocorrelation method—which is currently the main method for extracting the fundamental dispersion curve of surface waves—it is verified that the frequency-Bessel transform method can extract the higher-mode dispersion curve. Then, by taking the actual measured single-point noise data as an example, the effect of applying the frequency-Bessel transform to the actual noise data is tested, and the inversion of the fine structure of the strata by the addition of higher-mode dispersion, the use of the damped least squares inversion method, and the joint inversion of fundamental and higher-mode dispersion curves are analyzed. The higher-mode dispersion curve of Rayleigh surface wave extracted by the frequency-Bessel transform is much clearer, and the 2D shear wave velocity structure profile obtained from inversion explains the karst development area, karst strip area, and thickness of the Quaternary overburden. The inferred results match with the actual borehole data. Multi-mode imaging of background noise based on the frequency-Bessel method can be applied to depict karst in complex backgrounds, and has significant potentiality in the field of ambient seismic noise tomography, providing a new idea and method for karst detection in near-surface engineering.

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Characterizing the Subsurface Structure Using 3-D Magnetotelluric Inversion: A Case Study of M'rara Basin, Algerian Sahara

Foudili

Bouzid

Berguig

et al. 2022

Advances in Geophysics, Tectonics and Petroleum Geosciences

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Investigating karst collapse geohazards using magnetotellurics: A case study of M'rara basin, Algerian Sahara

Cited by 8 publications

References 37 publications

Investigating Land Use and Karst Disaster Mitigation through Geoelectric and Magnetotelluric Methods: A Case Study in Sendang Biru, Malang, Indonesia

Investigating Land Use and Karst Disaster Mitigation through Geoelectric and Magnetotelluric Methods: A Case Study in Sendang Biru, Malang, Indonesia

Multi-Mode Imaging of Ambient Background Noise for Karst Detection in the Limestone Area Based on Frequency-Bessel Transform

Characterizing the Subsurface Structure Using 3-D Magnetotelluric Inversion: A Case Study of M'rara Basin, Algerian Sahara

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