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Blast-Assisted Subsurface Characterisation Using a Novel Distributed Acoustic Sensing Setup Based on Geometric

Sabahat Shaheen1, Konstantin Hicke1, Katerina Krebber1

  • 1Bundesanstalt für Materialforschung und -Prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany.

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|January 11, 2024
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Summary
This summary is machine-generated.

This study introduces a new seismic monitoring system using geometric phases for Earth

Keywords:
distributed acoustic sensingdistributed fiber optic sensingearthquake monitoringgeometric phaseseismologysubsurface characterisationsurface waves

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Area of Science:

  • Geophysics
  • Seismology
  • Optical Sensing

Background:

  • Characterizing Earth's subsurface is crucial for understanding geological processes.
  • Traditional seismic monitoring methods can be limited by noise and post-processing requirements.

Purpose of the Study:

  • To present a novel Distributed Acoustic Sensing (DAS) setup for Earth's subsurface characterization.
  • To optimize the spatial resolution of the proposed DAS system.
  • To determine shear wave velocity profiles of the Earth's crust.

Main Methods:

  • Utilizing geometric phases in coherent heterodyne detection for DAS.
  • Generating surface waves with controlled explosive blasts.
  • Employing a 10 km dark fiber link to record strain signals.
  • Applying an optimized seismic interferometric technique for dispersion analysis.
  • Using an optimized evolutionary algorithm to determine shear wave velocities.

Main Results:

  • Achieved spike-free and low-noise strain data, minimizing post-processing.
  • Demonstrated the potential for real-time seismic monitoring.
  • Successfully determined the depth profile of shear wave velocities in the Earth's crust.

Conclusions:

  • The novel DAS setup offers a promising solution for subsurface characterization.
  • The optimized system provides high-quality seismic data suitable for real-time applications.
  • This technique advances our ability to probe the Earth's crustal structure.