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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):1−14 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 Sinica45(3):1−14 doi: 10.11939/jass.20220175

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

doi: 10.11939/jass.20220175
  • Received Date: 2022-09-18
  • Rev Recd Date: 2022-11-14
  • Available Online: 2023-01-30
  • 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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