On the Use of Fluxgate 3‐Axis Magnetometers in Archaeology: Application with a Multi‐sensor Device on the Site of Qasr ‘Allam in the Western Desert of Egypt

Gavazzi, Bruno; Alkhatib-Alkontar, Rozan; Munschy, Marc; Colin, Frédéric; Duvette, Catherine

doi:10.1002/arp.1553

Cited by 19 publications

(7 citation statements)

References 16 publications

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“…Such devices have been used in ground surveys for archaeological prospection with increased resolution (0.3 nT), in large scale surveys over dozens of hectares (e.g. Gavazzi et al, 2017) to high-resolution surveys of subtle structures like post holes (e.g. Wassong & Gavazzi, 2020).…”

mentioning

confidence: 99%

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An Integrated Approach for Ground and Drone-Borne Magnetic Surveys and their Interpretation in Archaeological Prospection

Gavazzi¹,

Reiller²,

Munschy³

2021

archeosciences

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mentioning

confidence: 99%

“…Figure 1. Comparison between: (A) vertical gradient computed from TMI data acquired 1 m above the ground; (B) vertical gradient measured 0.3 m above the ground(Gavazzi et al, 2017).…”

mentioning

confidence: 99%

An Integrated Approach for Ground and Drone-Borne Magnetic Surveys and their Interpretation in Archaeological Prospection

Gavazzi¹,

Reiller²,

Munschy³

2021

archeosciences

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“…The final root‐mean‐square (RMS) error is then less than 2 nT at 25 Hz and corresponds mainly to white noise due to the digitization process. Gavazzi et al (2017) showed that a calibrated fluxgate magnetometer mounted on a backpack for ground surveys has a RMS error of about 0.3 nT which is in the same range as the expected error of a surveying device using absolute magnetometers and a compensation unit (<0.8 nT according to Coyle et al, 2014). Munschy and Fleury (2011) showed that this range of RMS error can be obtained in airborne surveys regardless of the level of magnetization of the carrier.…”

Section: Introductionmentioning

confidence: 91%

On the Use of Aeromagnetism for Geological Interpretation: 1. Comparison of Scalar and Vector Magnetometers for Aeromagnetic Surveys and an Equivalent Source Interpolator for Combining, Gridding, and Transforming Fixed Altitude and Draping Data Sets

et al. 2020

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Airborne magnetic surveys are common in geosciences. High‐precision surveys are usually performed at a low altitude, draping the topography, using scalar absolute magnetometers and active compensation systems to correct the disturbances generated by the carrier. Another solution is to measure the total magnetic intensity using vector magnetometers, which allows compensation for aircraft fields to be calculated directly, without compensation systems. This study uses data of an industrial airborne survey and of a vector magnetometer survey with a small overlapping area in the Vosges (France) to compare both data sets and shows that both solutions provide results of the same overall precision. This paper also addresses the issue of combining fixed altitude and draped level data sets as well as topographic effect management by proposing an equivalent source interpolator based on a set of simple dipole sources. A synthetic case shows that the equivalent source interpolator allows to compute grids of the magnetic anomaly as well as potential field transforms from a draped data set with an error level a few orders of magnitude lower than could be obtained with minimum curvature, a classically applied interpolator. The interpolator is also tested on a case study in the Vosges massif of which geological interpretation is presented in Bertrand et al. (2020, https://doi.org/10.1029/2019JB017688). The results confirm the observations made on the synthetic case and show that the equivalent source interpolator is more tolerant to navigation errors (altitude) than minimum curvature and allows more rigorous computation of potential field transforms of draped data sets.

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“…The magnetic method is most often used to image the structure of the basement, either in outcropping rocks (Bournas et al 2003;Martelat et al 2014) or below a sedimentary cover (Babaahmadi & Rosenbaum 2015;Brahimi et al 2018). The magnetic method can also provide valuable information on smaller-scale sedimentary bodies, buried archaeological remains (Gavazzi et al 2017) or pipe and power networks, but only if high-resolution data are available and if a sufficient, measurable magnetic contrast does exist between the studied structures and the host rocks. A limited number of publications has addressed magnetic characterization of buried palaeochannels or palaeovalley of fluvial (Mackey et al 2000;Jessell et al 2015) or glacial (Parker Gay 2004;Fichler et al 2005;Olesen et al 2010) origin.…”

Section: Introductionmentioning

confidence: 99%

Deciphering channel networks from aeromagnetic potential field data: the case of the North Sea Quaternary tunnel valleys

Brahimi

Maire

Ghienne

et al. 2019

Geophysical Journal International

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Summary High-resolution magnetic data and potential field methods have been used to perform a detailed analysis of networks of late Quaternary subglacially-cut tunnel valleys (central Viking Graben, Norwegian sector of the North Sea). High-frequency, ribbon-like, sinuous, paired magnetic anomalies interpreted to be the signature of tunnel valleys are identified. Such magnetic anomalies have 1 to 8 nT amplitudes and reflect a magnetic susceptibility contrast between valley infills and the host sediments. Fractional vertical derivative and horizontal gradient transforms provide the best control on the accurately delineation of tunnel valleys by plotting automatically the extrema. The 2D forward modelling is a very effective approach to determinating the geometric parameters and magnetic susceptibility of the modeled valleys. It allows to determine the finite-width flat horizontal thin geometry as the most appropriate simple geometry to simulate the magnetic anomaly linked to a channel structure. The application of Euler deconvolution using complex algebra allows to substantiate the structural index (n = 1.5) for simple palaeovalley geometries and to determine fair valley depth estimates.

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On the Use of Fluxgate 3‐Axis Magnetometers in Archaeology: Application with a Multi‐sensor Device on the Site of Qasr ‘Allam in the Western Desert of Egypt

Abstract: International audienc

Cited by 19 publications

References 16 publications

An Integrated Approach for Ground and Drone-Borne Magnetic Surveys and their Interpretation in Archaeological Prospection

An Integrated Approach for Ground and Drone-Borne Magnetic Surveys and their Interpretation in Archaeological Prospection

On the Use of Aeromagnetism for Geological Interpretation: 1. Comparison of Scalar and Vector Magnetometers for Aeromagnetic Surveys and an Equivalent Source Interpolator for Combining, Gridding, and Transforming Fixed Altitude and Draping Data Sets

Deciphering channel networks from aeromagnetic potential field data: the case of the North Sea Quaternary tunnel valleys

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