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Wang Y Z，Yang T，Liu C G，Liu D，Wu Y C. 2023. Short duration events on OBS recordings in the Northwest Sub-basin of the South China Sea. Acta Seismologica Sinica，45（3）：431−444. DOI: 10.11939/jass.20220175
Citation: Wang Y Z，Yang T，Liu C G，Liu D，Wu Y C. 2023. Short duration events on OBS recordings in the Northwest Sub-basin of the South China Sea. Acta Seismologica Sinica，45（3）：431−444. DOI: 10.11939/jass.20220175
shu

Short duration events on OBS recordings in the Northwest Sub-basin of the South China Sea

  • 1.

    School of Instrumentation Science and Engineering，Harbin Institute of Technology， Harbin 150001，China

  • 2.

    OBS Laboratory，Department of Ocean Science and Engineering，Southern University of Science and Technology，Shenzhen 518055，China

  • 3.

    Shanghai Sheshan National Geophysical Observatory，Guangdong Shanghai 201600，China

  • 4.

    Southern Marine Science and Engineering Guangdong Laboratory （Guangzhou），Guangzhou 510301，China

  • 5.

    The First Institute of Oceanography （FIO），Shandong Qingdao 266061，China

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  • Received Date: September 17, 2022
  • Revised Date: November 13, 2022
  • Available Online: January 29, 2023
  • Published Date: May 14, 2023
    Graphical Abstract
    • Abstract
  • Based on the analysis of the data on broadband ocean bottom seismographs deployed in the Northwestern sub-basin of the South China Sea from October 2019 to May 2020. We detected more than 150 000 short duration events （SDEs） at each OBS station by using STA/LTA algorithm. The characteristic of SDE signals is analyzed. According to different signal characteristics, these SDEs are classified as consecutive short duration events （C-SDEs） and random short duration events （R-SDEs）. The possible generation mechanisms for C-SDEs and R-SDEs are analyzed, respectively. We infer there are active sources of C-SDE signal in the Northwest Sub-basin of the SCS. The source may be caused by human activities, such as air gun firing or low frequency hydroacoustic communication signals. The R-SDE sources appear close to the OBS stations, likely generated by the ruptures due to gas escape from seafloor sediments. R-SDEs on OBS recordings indicate persistent gas escape from the sedimentary layer in the northwestern sub-basin of the SCS.
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