Distributed sensing of microseisms and teleseisms with submarine dark fibers
Abstract
Sparse seismic instrumentation in the oceans limits our understanding of deep Earth dynamics and submarine earthquakes. Distributed acoustic sensing (DAS), an emerging technology that converts optical fiber to seismic sensors, allows us to leverage pre-existing submarine telecommunication cables for seismic monitoring. Here we report observations of microseism, local surface gravity waves, and a teleseismic earthquake along a 4192-sensor ocean-bottom DAS array offshore Belgium. We observe in-situ how opposing groups of ocean surface gravity waves generate double-frequency seismic Scholte waves, as described by the Longuet-Higgins theory of microseism generation. We also extract P- and S-wave phases from the 2018-08-19 M_w8.2 Fiji deep earthquake in the 0.01-1 Hz frequency band, though waveform fidelity is low at high frequencies. These results suggest significant potential of DAS in next-generation submarine seismic networks.
Additional Information
© 2019 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. Received 20 May 2019; Accepted 21 October 2019; Published 18 December 2019. We thank Jörn Callies, Victor Tsai, and Andrew Thompson for insightful discussions. This work was supported in part by the members of the Space Innovation Council at Caltech, the Caltech-JPL President's and Director's Research and Development Fund (PDRDF), the DOMINO Water JPI project under the WaterWorks2014 cofounded call by EC Horizon 2020 and Spanish MINECO, and the regional program SINFOTON2-CM: P2018/NMT-4326. E.F.W. was supported by an NSF Graduate Research Fellowship. M.R.F.-R. and H.F.M. acknowledge financial support from the Spanish Ministerio de Ciencia, Innovación y Universidades (MICINN) under contract nos. FJCI-2016-27881 and IJCI-2017-33856, respectively. R.M. acknowledges financial support from the EU's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Action grant agreement no. 722509EU (ITN-FINESSE). Z.Z. acknowledges support under NSF CAREER Award 1848166. M.G.-H. acknowledges funding from the Spanish MINECO through projects TEC2015-71127-C2-2-R and RTI2018-097957-B-C31. Data availability: Raw strain records from the BDASA are available on a public data repository at https://doi.org/10.22002/D1.1296. More information about reading and processing data files can be obtained from the authors upon request. Code availability: All codes required to reproduce the figures in this paper are written in Python and available from the authors upon request. Author Contributions: E.F.W., M.R.F.-R., and H.F.M. carried out data analysis and wrote the manuscript; R.M. and R.V. acquired the data; Z.Z. and M.G.-H. advised data analysis and edited the manuscript. Competing interests: The authors declare no competing interests.Attached Files
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Additional details
- Alternative title
- Teleseisms and microseisms on an 2 ocean-bottom distributed acoustic sensing array
- PMCID
- PMC6920360
- Eprint ID
- 100337
- Resolver ID
- CaltechAUTHORS:20191217-192034541
- Caltech Space Innovation Council
- JPL President and Director's Fund
- DOMINO Water JPI project
- SINFOTON2-CM: P2018/NMT-4326
- Fondo Europeo de Desarrollo Regional (FEDER)
- NSF Graduate Research Fellowship
- FJCI-2016-27881
- Ministerio de Ciencia, Innovación y Universidades (CIENCIA)
- IJCI-2017-33856
- Ministerio de Ciencia, Innovación y Universidades (CIENCIA)
- 722509EU
- Marie Curie Fellowship
- EAR-1848166
- NSF
- TEC2015-71127-C2-2-R
- Ministerio de Economía, Industria y Competitividad (MINECO)
- RTI2018-097957-B-C31
- Ministerio de Economía, Industria y Competitividad (MINECO)
- Created
-
2019-12-18Created from EPrint's datestamp field
- Updated
-
2022-11-15Created from EPrint's last_modified field
- Caltech groups
- Center for Geomechanics and Mitigation of Geohazards (GMG), Division of Geological and Planetary Sciences, Seismological Laboratory