Preprints
https://doi.org/10.5194/egusphere-2022-823
https://doi.org/10.5194/egusphere-2022-823
04 Oct 2022
 | 04 Oct 2022

OBS noise reduction from horizontal and vertical components using harmonic-percussive separation algorithms

Zahra Zali, Theresa Rein, Frank Krüger, Matthias Ohrnberger, and Frank Scherbaum

Abstract. Records from ocean bottom seismometers (OBS) are highly contaminated by noise, which is much higher compared to data from most land stations, especially on the horizontal components. The high energy of the oceanic noise at frequencies below 1 Hz complicates the analysis of the teleseismic earthquake signals recorded by OBSs.

Previous studies suggested different approaches to remove low frequency noises from the data, but mainly focused on the vertical component. The records of horizontal components, crucial for the application of many methods in passive seismological analysis of body and surface waves could not be much improved in the teleseismic frequency band. Here we introduce a noise reduction method, which is derived from the harmonic-percussive separation algorithms used in Zali et al., (2021) in order to separate long-lasting narrowband signals from broadband transients in the OBS signal. This leads to significant noise reduction of OBS records on both the vertical and horizontal components and increases the earthquake signal to noise ratio without distortion of the broadband earthquake waveforms. This is proved through synthetic tests by measuring SNR and cross-correlation coefficient where both showed significant improvement for different realistic noise realizations. The application of denoised signals in surface wave analysis and receiver function is discussed through synthetic and real tests.

Journal article(s) based on this preprint

01 Mar 2023
Ocean bottom seismometer (OBS) noise reduction from horizontal and vertical components using harmonic–percussive separation algorithms
Zahra Zali, Theresa Rein, Frank Krüger, Matthias Ohrnberger, and Frank Scherbaum
Solid Earth, 14, 181–195, https://doi.org/10.5194/se-14-181-2023,https://doi.org/10.5194/se-14-181-2023, 2023
Short summary

Zahra Zali et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-823', Anonymous Referee #1, 14 Nov 2022
    • AC1: 'Reply on RC1', Zahra Zali, 17 Nov 2022
  • RC2: 'Comment on egusphere-2022-823', Anonymous Referee #2, 22 Nov 2022
    • AC2: 'Reply on RC2', Zahra Zali, 28 Nov 2022

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-823', Anonymous Referee #1, 14 Nov 2022
    • AC1: 'Reply on RC1', Zahra Zali, 17 Nov 2022
  • RC2: 'Comment on egusphere-2022-823', Anonymous Referee #2, 22 Nov 2022
    • AC2: 'Reply on RC2', Zahra Zali, 28 Nov 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Zahra Zali on behalf of the Authors (28 Nov 2022)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (01 Dec 2022) by Simone Pilia
RR by Anonymous Referee #2 (03 Jan 2023)
ED: Publish subject to minor revisions (review by editor) (10 Jan 2023) by Simone Pilia
AR by Zahra Zali on behalf of the Authors (13 Jan 2023)  Author's response   Author's tracked changes   Manuscript 
EF by Polina Shvedko (13 Jan 2023)  Supplement 
ED: Publish as is (18 Jan 2023) by Simone Pilia
ED: Publish as is (05 Feb 2023) by CharLotte Krawczyk (Executive editor)
AR by Zahra Zali on behalf of the Authors (09 Feb 2023)

Journal article(s) based on this preprint

01 Mar 2023
Ocean bottom seismometer (OBS) noise reduction from horizontal and vertical components using harmonic–percussive separation algorithms
Zahra Zali, Theresa Rein, Frank Krüger, Matthias Ohrnberger, and Frank Scherbaum
Solid Earth, 14, 181–195, https://doi.org/10.5194/se-14-181-2023,https://doi.org/10.5194/se-14-181-2023, 2023
Short summary

Zahra Zali et al.

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