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[1]ZHANG Huai,NIE Zhaosheng,LIU Gang,et al.Determination of Three Parameters of the 2021 Maduo MW7.4 Earthquake Using High-rate BDS/GPS[J].Journal of Seismological Research,2023,46(02):216-225.[doi:10.20015/j.cnki.ISSN1000-0666.2023.0026 ]

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Determination of Three Parameters of the 2021 Maduo M_W7.4 Earthquake Using High-rate BDS/GPS

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 46 Number of periods: 2023 02 Page number: 216-225 Column: Public date: 2023-03-10

Title:: Determination of Three Parameters of the 2021 Maduo M_W7.4 Earthquake Using High-rate BDS/GPS

Author(s):: ZHANG Huai¹; NIE Zhaosheng¹; LIU Gang¹; XIONG Wei¹; NI Yipeng¹; HUANG Jun²; (1.Institute of Seismology,China Earthquake Administration,Wuhan 430071,Hubei,China)(2.Helongjiang Provincial Gedogy and Mineral Resources Test and Application Inshitute,Harbin 150036,Heilongjiang,China)

Keywords:: BDS/GPS; PPP; crustal deformation monitoring; three parameters of an earthquake; Maduo earthquake

CLC:: P315.725

DOI:: 10.20015/j.cnki.ISSN1000-0666.2023.0026

Abstract:: The seismic time series of 10 high-rate GNSS stations during the 2021 Maduo M_W7.4 earthquake were acquired using GPS and BDS/GPS fusion PPP based on the GREAT program,and the velocity time series 30 minutes before the earthquake were obtained based on the variometric approach.The analysis found that the BDS/GPS relative to GPS velocity RMS values in the EW,NS and UP orientation can be improved by 14.8%,15.2% and 3.5% respectively.The seismic wave's first arrival-time was extracted from the BDS/GPS time series of each station using the STA/LTA method,the location of the epicenter of the Maduo earthquake was(34.63°N,98.51°E),and the earthquake's original time was 18:04:29(UTC),calculated from the time of first arrival of seismic waves at each station.This article refers to the time of the Maduo earthquake,using the Coordinated Universal Time.The epicenter of the Maduo earthquake calculated by GPS time series is(34.6°N,98.54°E),and the original time is 18:04:28.8.Using GPS and BDS/GPS peak ground displacement,the Maduo earthquake magnitude was inverted according to the empirical formula,and the obtained magnitudes were M_W7.36 and M_W7.34,respectively.The BDS/GPS magnitude was closer to the result published by GCMT.The results show that the BDS/GPS fusion PPP solution can improve the stability of time series and reduce noise,which can more realistically describe the surface displacement changes during the earthquake,thus improving the accuracy of the magnitude solution and providing better data support for earthquake early warning and post-earthquake rescue.

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Last Update: 2023-03-10