Quantitative interpretation of magnetic anomalies from bodies approximated by thick bed models in complex environments

Eppelbaum, Lev

doi:10.1007/s12665-015-4622-1

Cited by 22 publications

(13 citation statements)

References 31 publications

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“…Discontinuous noise appears as isolated spikes or set of closely-spaced spikes on the aeromagnetic data, which is typically associated with the pilot's actions such as radio transmissions or switching direct current and to lightning strikes or cultural sources (e.g. train, power lines) (Reeves, 2005;Eppelbaum, 2011Eppelbaum, , 2015. Continuous noise comes from the motions of the aircraft, such as the oscillation of wings while in flight through turbulent weather, which produces a high-frequency unwanted noise signal.…”

Section: Methodsmentioning

confidence: 99%

“…Magnetic surveying has been extensively used in the search for mineral deposits, oil and gas reservoirs, geothermal resources, as well as for a variety of other purposes such as natural hazards assessment, basement structural studies, mapping subsurface archaeology and unexploded ordnance (UXO) (Nabighian et al, 2005;Eppelbaum, 2011;Fairhead, 2012;Hinze et al, 2013;Eppelbaum, 2015;Kruse, 2013;Haldar, 2018;Turner et al, 2015;Zhou, 2018). In general, magnetic measurements can provide information on and insight into the physical, chemical, and even biological processes that have affected the iron phases within.…”

Section: Introductionmentioning

confidence: 99%

“…Airborne magnetometry (aeromagnetometry) is an inexpensive, efficient, and effective regional reconnaissance tool (Reeves, 2005;Eppelbaum, 2015;Haldar, 2018). The method offers improved accessibility to areas restricted to terrestrial surveys such as remote areas, offshore areas, and thickly-vegetated regions as well as rapid sampling of the local geomagnetic field compared to its ground or space counterpart (Council, 1995;Haldar, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Traditionally, aeromagnetic surveys are often conducted using fixed-winged aircraft with sensors mounted on both the wings (horizontal sensor configuration) or a tail-boom behind the aircraft. Thanks to decades of development and noise reduction techniques coupled with new advances in sensor technologies, such modern aeromagnetic surveys can achieve a sensitivity of 0.1 nanoTesla (nT) (Eppelbaum, 2015;Aminzadeh and Dasgupta, 2013;Turner et al, 2015). However, geophysicists have realized that aeromagnetometry using light-weight and compact platforms such as unmanned aerial vehicles (UAV) can even further reduce the surveying cost and make it more convenient in terms of logistics (Eppelbaum and Mishne, 2011;Tuck et al, 2018;Mu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Experiments on magnetic interference for a portable airborne magnetometry system using a hybrid unmanned aerial vehicle (UAV)

Jirigalatu¹,

Krishna²,

Silva³

et al. 2020

Preprint

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Abstract. Airborne magnetic surveys are an important and efficient tool for mapping the subsurface, providing insights e.g. into mineral deposits. Compared to traditional ground methods, airborne magnetic surveys offer great advantages with improved access and rapid sampling. But the cost and hassle of transporting and operating a conventional manned airborne magnetic survey system are strong impediments for its wider use. In addition, the conventional airborne systems are challenged by the need for low-altitude (&leq; 80 m) surveying to detect small-scale subsurface features evident in ground surveys. Portable and compact airborne magnetic survey systems using unmanned aerial vehicles (UAVs) can not only bridge the gap between conventional airborne magnetic surveys and ground magnetic surveys but also complement magnetic surveys to fit broader geophysical applications. Therefore, developing high-quality, stable, and portable UAV-borne survey systems is of high interest to the geophysical exploration community. However, developing such a system is challenging owing to strong magnetic interference introduced by onboard electric engines and other onboard electronic devices. As a result, tests concerning the static and dynamic magnetic interference of a UAV are critical to assess the severity of the interference and can help to improve the design of the system at the early stage of development. A static experiment and two dynamic experiments were conducted to understand the characterization of the magnetic interference of our hybrid vertical take-off and landing (VTOL) UAV. The results of the static experiment show that the wing area is highly magnetic due to the proximity to servomotors and motors, but the area along the longitudinal axis of the UAV is relatively magnetically quiet. To reduce the magnetic signature, the highly-magnetic servomotors on the wings were replaced with less magnetic servomotors of a brush-less type. Assisted by aerodynamic simulations, we further designed a front-mounting solution for two compact magnetometers. Two dynamic experiments were conducted with this setup to understand the dynamic interference of the UAV in operation. The results of the dynamic experiments reveal that the strongest source of in-flight magnetic interference is mainly due to the cables connecting the battery to the flight controller and that this effect is most influential during pitch maneuvers of the aircraft.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experiments on magnetic interference for a portable airborne magnetometry system using a hybrid unmanned aerial vehicle (UAV)

Jirigalatu¹,

Krishna²,

Silva³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Thus, a modelling of the magnetic anomalies is desirable in general to improve the interpretation of geometrical and compositional effects of non-exposed rocks (e.g. Eppelbaum, 2015;Eppelbaum and Mishne, 2011;Ialongo et al, 2014). Since we are aware of the problematics, primarily we focus on the interpretation of the effects of distinct types and compositions of exposed rocks concerning the observed magnetic anomalies.…”

Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

Mars MOURA magnetometer demonstration for high-resolution mapping on terrestrial analogues

Díaz-Michelena

Kilian

Sanz

et al. 2016

Geosci. Instrum. Method. Data Syst.

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Abstract. Satellite-based magnetic measurements of Mars indicate complex and very strong magnetic anomalies, which led to an intensive and long-lasting discussion about their possible origin. To make some progress in the investigation of the origin of these anomalies the MOURA vector magnetometer was developed for in situ measurements on Mars. In this work we propose the utilisation of such an instrument for future planetary on-ground surveys. The proof of its suitability is seen through testing it on various terrestrial analogues characterised by the distinct magnetic anomalies of their basement rocks: (1) a magnetite body of EL Laco (up to +110 000 nT) and its transition to surrounding andesites (< +2000 nT) in the northern Andes of Chile showing the highest local magnetic anomalies. The magnetite-bearing ore body has highly variable local anomalies due to its complex formation history where a significant dispersion in palaeoorientations has been previously reported, while our vector data show relatively uniform and probably induced declinations. (2) A basaltic spatter cone of the Pali Aike volcanic field, in southern Chile, was characterised by very strong magnetic anomalies along the crater rim (up to +12 000 nT), controlled by the amount of single domain magnetites in the ground mass of the basalts. Due to their strong remanent signature, palaeo-declinations of the lavas and reorientations of collapsed blocks could be constrained by the vector data. (3) The Monturaqui meteorite crater (350 m diameter), in northern Chile, shows significant variations of its anomalies (from −2000 to > +6000 nT) in restricted areas of several square metres along its crater rim related to unexposed iron-bearing fragments of the impactor while its granitic and ignimbritic target rocks exhibit only very weak anomalies. (4) An area with several amphibolitic dykes, which cross-cut a Cretaceous granitoid in the southernmost Andes, where a decimetre-scale mapping was performed. In this case, pyrrhotite is the only magnetic carrier. It was formed during hydrothermal processes within the dykes. Very low (+40 to +120 nT) positive magnetic anomalies clearly depict the amount of 1-4 vol % pyrrhotite in these dykes, which is important as a mineralogical indicator as well as to detect associated gold and copper enrichment.

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Advanced Analysis of Self-potential Anomalies: Review of Case Studies from Mining, Archaeology and Environment

Eppelbaum

2021

Self-Potential Method: Theoretical Modeling and Applications in Geosciences

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Quantitative interpretation of magnetic anomalies from bodies approximated by thick bed models in complex environments

Cited by 22 publications

References 31 publications

Experiments on magnetic interference for a portable airborne magnetometry system using a hybrid unmanned aerial vehicle (UAV)

Experiments on magnetic interference for a portable airborne magnetometry system using a hybrid unmanned aerial vehicle (UAV)

Mars MOURA magnetometer demonstration for high-resolution mapping on terrestrial analogues

Advanced Analysis of Self-potential Anomalies: Review of Case Studies from Mining, Archaeology and Environment

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