Seismometer-detached broadband ocean bottom seismograph (OBS): development, test, and data quality analysis

Liu Dan1; Yang Ting1,2,3; Le Ba Manh1; Wu Yue Chu1; Wang YiZhi1; Huang XinFeng1; Du HaoRan1; Wang Jian1; Chen YongShun1

2022-07-01

10.6038/cjg2022P0441

CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION   Impact Factor & Quartile

0001-5733

The broadband ocean bottom seismograph (OBS) is the core instrument for seismological studies such as imaging the oceanic lithosphere. This paper presents the design of the domestic seismometer-detached broadband OBS (Pankun) and its tests in the South China Sea (SCS), as well as a detailed analysis of its performance and data quality. In addition to the seismometer-detached type, Pankun has the following features: a unique anti-current structure, an automatic device separating the seismometer, a broadband seismometer (100 Hz similar to 120 s), and low-power consumption and long operational time. Compared with the OBSs in the previous experiment in 2012, Pankun has much better performances in recovery rate, horizontal orientation determination, leveling device, and clock accuracy. More importantly, the quality of earthquake waveforms has also been greatly improved benefits from its unique anti-current structure, especially for the horizontal components. The quality of horizontal components of Pankun is comparable to nearby land stations, while low-frequency components (>10 s) have lower noise levels than international counterparts. These analyses show that Pankun's data can be used for most seismological applications, including receiver function and anisotropy analysis that require three-component seismic data. Finally, the broadband characteristics of Pankun' s data, especially high-quality, low-frequency signals, are more conducive to studying the structure and processes of the oceanic lithosphere and upper mantle using the long-period surface waves and the finite frequency body waves.

Ocean bottom seismograph Oceanic lithosphere Seismic tomography Receiver function Anisotropy

SCI

Chinese

First ; Corresponding

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000823029100015

SCIENCE PRESS

GEOSCIENCES

Web of Science

1.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
2.Southern Marine Sci & Engn Guangdong Lab, Guangzhou 510301, Peoples R China
3.Shanghai Sheshan Natl Geophys Observ, Shanghai 201600, Peoples R China

Liu Dan,Yang Ting,Le Ba Manh,et al. Seismometer-detached broadband ocean bottom seismograph (OBS): development, test, and data quality analysis[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2022,65(7).

Liu Dan.,Yang Ting.,Le Ba Manh.,Wu Yue Chu.,Wang YiZhi.,...&Chen YongShun.(2022).Seismometer-detached broadband ocean bottom seismograph (OBS): development, test, and data quality analysis.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,65(7).

Liu Dan,et al."Seismometer-detached broadband ocean bottom seismograph (OBS): development, test, and data quality analysis".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 65.7(2022).