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https://doi.org/10.5194/se-2020-157
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2020-157
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  25 Sep 2020

25 Sep 2020

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This preprint is currently under review for the journal SE.

Evaluating Seismic Beamforming Capabilities of Distributed Acoustic Sensing Arrays

Martijn P. A. van den Ende and Jean-Paul Ampuero Martijn P. A. van den Ende and Jean-Paul Ampuero
  • Université Côte d’Azur, IRD, CNRS, Observatoire de la Côte d’Azur, Géoazur, France

Abstract. The versatility and cost-efficiency of fibre-optic Distributed Acoustic Sensing (DAS) technologies facilitate geophysical monitoring in environments that were previously inaccessible for instrumentation. Moreover, the spatio-temporal data density permitted by DAS naturally appeals to seismic array processing techniques, such as beamforming for source location. However, the measurement principle of DAS is inherently different from that of conventional seismometers, providing measurements of ground strain rather than ground motion, and so the suitability of traditional seismological methods requires in-depth evaluation. In this study, we evaluate the performance of a DAS array in the task of seismic beamforming, in comparison with a co-located nodal seismometer array. We find that, even though the nodal array achieves excellent performance in localising a regional ML 4.3 earthquake, the DAS array exhibits poor waveform coherence and consequently produces inadequate beamforming results that are dominated by the signatures of shallow scattered waves. We demonstrate that this behaviour is likely inherent to the DAS measurement principle, and so new strategies need to be adopted to tailor array processing techniques to this emerging measurement technology.

Martijn P. A. van den Ende and Jean-Paul Ampuero

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Status: open (until 06 Nov 2020)
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Martijn P. A. van den Ende and Jean-Paul Ampuero

Data sets

Brady's Geothermal Field DAS Earthquake Data University of Wisconsin https://doi.org/10.15121/1334285

Model code and software

Evaluating seismic beamforming capabilities of Distributed Acoustic Sensing arrays M. van den Ende and J.-P. Ampuero https://doi.org/10.6084/m9.figshare.12899288

Martijn P. A. van den Ende and Jean-Paul Ampuero

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Latest update: 25 Oct 2020
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Short summary
Distributed Acoustic Sensing (DAS) is an emerging technology that measures stretching of an optical-fibre cable. This technology can be used to record the ground shaking of earthquakes, which offers a cost-efficient alternative to conventional seismometers. Since DAS is relatively new, we need to verify that existing seismological methods can be applied to this new data type. In this study, we reveal several issues by comparing DAS with conventional seismometer data for earthquake localisation.
Distributed Acoustic Sensing (DAS) is an emerging technology that measures stretching of an...
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