Short duration events on OBS recordings in the Northwest Sub-basin of the South China Sea 中国南海西北次海盆海底地震记录的短时事件分析

Wang，Yizhi1,2; Yang，Ting2,3,4; Liu，Chenguang5; Liu，Dan1,2; Wu，Yuechu2

2023-05-01

10.11939/jass.20220175

Acta Seismologica Sinica   Impact Factor & Quartile

0253-3782

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.

gas escape ocean bottom seismographs （OBS） short duration events STA/LTA

Chinese

Others

2-s2.0-85164509230

Scopus

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,Shanghai,Guangdong,201600,China
4.Southern Marine Science and Engineering Guangdong Laboratory （Guangzhou）,Guangzhou,510301,China
5.The First Institute of Oceanography （FIO）,Qingdao,Shandong,266061,China

Wang，Yizhi,Yang，Ting,Liu，Chenguang,等. Short duration events on OBS recordings in the Northwest Sub-basin of the South China Sea 中国南海西北次海盆海底地震记录的短时事件分析[J]. Acta Seismologica Sinica,2023,45(3):431-444.

Wang，Yizhi,Yang，Ting,Liu，Chenguang,Liu，Dan,&Wu，Yuechu.(2023).Short duration events on OBS recordings in the Northwest Sub-basin of the South China Sea 中国南海西北次海盆海底地震记录的短时事件分析.Acta Seismologica Sinica,45(3),431-444.

Wang，Yizhi,et al."Short duration events on OBS recordings in the Northwest Sub-basin of the South China Sea 中国南海西北次海盆海底地震记录的短时事件分析".Acta Seismologica Sinica 45.3(2023):431-444.