Near-source effects on DAS recording: implications for tap tests

Author:

Kennett B L N1ORCID,Lai V H1,Miller M S1,Bowden D2ORCID,Fichtner A2ORCID

Affiliation:

1. Research School of Earth Sciences, The Australian National University , ACT 2601 Canberra , Australia

2. Department of Earth Sciences , ETH Zurich, 8092 Zurich , Switzerland

Abstract

SUMMARY In the immediate vicinity of a source, there are strong gradients in the seismic wavefield that are tamed and modified in distributed acoustic sensing (DAS) recording due to combined effects of gauge-length averaging and local stacking on the local strain field. Close to a source broadside propagation effects are significant, and produce a characteristic impact on the local DAS channels. In the presence of topography, of surface or cable, additional effects are introduced that modify the expected signal. All these influences mean that the results of tap tests used to calibrate the channel positions along a DAS cable may give a distorted view of the actual geometry. Such effects can be important for detailed mapping of faulting processes and comparable features.

Funder

American College of Rheumatology Research and Education Foundation

European Commission

Research, Innovation, Synergies, and Education

Eidgenössische Technische Hochschule Zürich

Publisher

Oxford University Press (OUP)

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