Skip to Main Content
Skip Nav Destination

Empirical investigations of the instrument response for distributed acoustic sensing (DAS) across 17 octaves

Patrick Paitz, Pascal Edme, Dominik Graeff, Fabian Walter, Joseph Doetsch, Athena Chalari, Cedric Schmelzbach and Andreas Fichtner
Empirical investigations of the instrument response for distributed acoustic sensing (DAS) across 17 octaves
Bulletin of the Seismological Society of America (October 2020) 111 (1): 1-10


With the potential of high temporal and spatial sampling and the capability of utilizing existing fiber-optic infrastructure, distributed acoustic sensing (DAS) is in the process of revolutionizing geophysical ground-motion measurements, especially in remote and urban areas, where conventional seismic networks may be difficult to deploy. Yet, for DAS to become an established method, we must ensure that accurate amplitude and phase information can be obtained. Furthermore, as DAS is spreading into many different application domains, we need to understand the extent to which the instrument response depends on the local environmental properties. Based on recent DAS response research, we present a general workflow to empirically quantify the quality of DAS measurements based on the transfer function between true ground motion and observed DAS waveforms. With a variety of DAS data and reference measurements, we adapt existing instrument-response workflows typically in the frequency band from 0.01 to 10 Hz to different experiments, with signal frequencies ranging from 1/3000 to 60 Hz. These experiments include earthquake recordings in an underground rock laboratory, hydraulic injection experiments in granite, active seismics in agricultural soil, and icequake recordings in snow on a glacier. The results show that the average standard deviations of both amplitude and phase responses within the analyzed frequency ranges are in the order of 4 dB and 0.167pi radians, respectively, among all experiments. Possible explanations for variations in the instrument responses include the violation of the assumption of constant phase velocities within the workflow due to dispersion and incorrect ground-motion observations from reference measurements. The results encourage further integration of DAS-based strain measurements into methods that exploit complete waveforms and not merely travel times, such as full-waveform inversion. Ultimately, our developments are intended to provide a quantitative assessment of site- and frequency-dependent DAS data that may help establish best practices for upcoming DAS surveys.

ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 111
Serial Issue: 1
Title: Empirical investigations of the instrument response for distributed acoustic sensing (DAS) across 17 octaves
Affiliation: ETH Zuerich, Department of Earth Sciences, Zurich, Switzerland
Pages: 1-10
Published: 20201020
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 23
Accession Number: 2021-006566
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N45°45'00" - N47°45'00", E05°49'60" - E10°30'00"
Secondary Affiliation: Silixia, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202105
Close Modal

or Create an Account

Close Modal
Close Modal