The potential of distributed acoustic sensing (DAS) in teleseismic studies from the Goldstone experiment
Abstract
Distributed acoustic sensing (DAS) is a newly developed technique that can transform telecommunication fiber optics into dense arrays of strainmeters. Since its advent, DAS has demonstrated its utility in the oil and gas industry and has become an integral tool for reservoir surveillance and vertical seismic profiling. Yet, the applications of DAS in passive seismology (with naturally occurring earthquakes) are still in its infancy. Here, we demonstrate the potential of DAS in teleseismic studies using the GOLFS experiment in Goldstone, California. By analyzing teleseismic waveforms from the 01/10/2018 M7.5 Honduras earthquake, we first show that dynamic strains recorded on DAS channels are in good consistency with horizontal velocities on the nearby broadband seismometer GSC in terms of waveform shapes, phases and spectrum contents. We then derive meter-scale arrival time measurements along the entire array by cross correlating dynamic strains on DAS channels with horizontally rotated GSC velocities. Conventional receiver functions are computed for DAS channels with the assumption that the vertical-component GSC velocity is a good approximation for the incident source wavelet. Rayleigh wave phase velocities at various frequency bands are estimated by comparing the amplitude ratios of GSC particle velocity and DAS strains, but accurate estimation would require better understanding of the frequency response and the coupling of DAS channels. Our study suggests that, with densely-distributed measurements and cost-effective installations, DAS will likely play an important role in many fields of passive seismology in the near future.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.S43E0662Y
- Keywords:
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- 7294 Seismic instruments and networks;
- SEISMOLOGY