GNSS World of China

Volume 45 Issue 6
Dec.  2020
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ZHANG Huanyu, LIN Jihang, CHEN Ting. Estimation of seismic elements from high-rate GPS observations[J]. GNSS World of China, 2020, 45(6): 37-45. doi: 10.13442/j.gnss.1008-9268.2020.06.006
Citation: ZHANG Huanyu, LIN Jihang, CHEN Ting. Estimation of seismic elements from high-rate GPS observations[J]. GNSS World of China, 2020, 45(6): 37-45. doi: 10.13442/j.gnss.1008-9268.2020.06.006
shu

Estimation of seismic elements from high-rate GPS observations

doi: 10.13442/j.gnss.1008-9268.2020.06.006

  • 1. School of Geodesy and Geomatics of Wuhan University, Wuhan 430072, China;

  • 2. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430072, China

  • Received Date: 2020-08-12
    Available Online: 2021-04-09
    Abstract
  • In this paper, theories and methods of estimating seismic elements from the high-rate GPS observations were presented. Selecting July 4th, 2019 and July 6th, 2019 Ridgecrest earthquakes as the research object, kinematic precise point positioning (PPP) was used to obtain the time series of displacement, then S transform algorithm was chosen to eliminate the noise of displacement time series, and the amplitude and period of the seismic wave were extracted from the denoised time series, and then we came up with the double 3-sigma rules to pick up the arrival time of body waves and surface waves, at last estimated the location of epicenter, magnitude and origin time of the earthquakes. Compared with the seismic elements provided by USGS, the deviation of the epicenter was about 10 km, the magnitude deviation was around 0.2, and the deviation of origin time of earthquakes was within 20 s. The results showed that the high-rate GPS observations can be used to estimate the seismic elements accurately.

     

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