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<p>Geomagnetic surveys provide insight into the subsurface for a range of applications, from fundamental understanding of geological processes, to mineral exploration and locating unexploded ordnance. A persistent challenge in performing such geomagnetic surveys is the joint problem of anthropogenic noise rejection and spatial aliasing, where the limited bandwidth (&lt; 10 Hz) of traditional surveying instruments introduces artefacts into the surveyed field. Optically Pumped Magnetometers (OPMs) exploit quantum mechanical effects to achieve highly sensitive and stable magnetic field measurements at comparatively high bandwidths. Recent advances in manufacturing have enabled OPMs to be packaged in compact and lightweight systems (<InlineEquation ID="IEq1"><EquationSource Format="TEX">\(\sim\)</EquationSource></InlineEquation> 1kg), that are ideal for geomagnetic surveying. Here, we show how an OPM can directly contribute to the reduction of spatial aliasing in traditional PPM data. We carry both a PPM and OPM over a 20 km long transect across the Highland Boundary Fault (HBF) in Scotland. We leverage the continuous acquisition of the OPM sampling at 90 Hz, equivalent to every <InlineEquation ID="IEq2"><EquationSource Format="TEX">\(\sim\)</EquationSource></InlineEquation>1 cm at walking pace (1 m.<InlineEquation ID="IEq3"><EquationSource Format="TEX">\(\hbox {s}^{-1}\)</EquationSource></InlineEquation>) versus every <InlineEquation ID="IEq4"><EquationSource Format="TEX">\(\sim\)</EquationSource></InlineEquation>200 m for our PPM (which had to be stationary for measurements) to reject magnetic noise and identify new small-scale (&lt; 200 m) geological structures. Further, we discuss the logistical advantages of the hybrid survey in terms of portability, survey delivery, data density, and data quality.</p>

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Spatial dealiasing of classical geomagnetic survey data through use of a microfabricated wearable quantum magnetometer

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月29日

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  • Stirling Scholes,
  • Alissa Forsythe,
  • Courtney Dyer,
  • Amy Gilligan,
  • Karen Lythgoe,
  • Jenny Jenkins,
  • Marcin Mrozowski,
  • Jack-Andrew Smith,
  • Stuart Ingleby

摘要

Geomagnetic surveys provide insight into the subsurface for a range of applications, from fundamental understanding of geological processes, to mineral exploration and locating unexploded ordnance. A persistent challenge in performing such geomagnetic surveys is the joint problem of anthropogenic noise rejection and spatial aliasing, where the limited bandwidth (< 10 Hz) of traditional surveying instruments introduces artefacts into the surveyed field. Optically Pumped Magnetometers (OPMs) exploit quantum mechanical effects to achieve highly sensitive and stable magnetic field measurements at comparatively high bandwidths. Recent advances in manufacturing have enabled OPMs to be packaged in compact and lightweight systems (\(\sim\) 1kg), that are ideal for geomagnetic surveying. Here, we show how an OPM can directly contribute to the reduction of spatial aliasing in traditional PPM data. We carry both a PPM and OPM over a 20 km long transect across the Highland Boundary Fault (HBF) in Scotland. We leverage the continuous acquisition of the OPM sampling at 90 Hz, equivalent to every \(\sim\)1 cm at walking pace (1 m.\(\hbox {s}^{-1}\)) versus every \(\sim\)200 m for our PPM (which had to be stationary for measurements) to reject magnetic noise and identify new small-scale (< 200 m) geological structures. Further, we discuss the logistical advantages of the hybrid survey in terms of portability, survey delivery, data density, and data quality.