In recent years, high-rate GPS (HRGPS) had been widely used in earthquake monitoring, and it was successfully utilized to measure the coseismic crustal deformations for many large earthquakes and to perform real-time inversion of seismic source parameters and coseismic fault slip distribution for achieving the aim of early warning for large earthquakes and tsunamis. A dense GNSS array of >400 stations has been deployed in the past 20+ years and many of the instruments have been upgraded to be able to collect high-rate (>1 Hz) GPS records. Despite this, the rich Taiwan HRGPS data had not been widely implemented to analyze earthquake ground motion, for example the estimations of coseismic displacement for recent Taiwan large earthquakes were still based on the daily or hourly averaged coordinate solutions, which may be not reasonable if there is obvious post-seismic deformation in the first 24h. Here we propose the Smoothness Priors Method (SPM) to rapidly extract static offset from GPS displacement waveforms for recent large Taiwan earthquakes, and the results will be compared with the past solutions from daily-based measurements. Moreover, the separated high-frequency GPS displacement waveforms, which did not suffer from the saturation effects, can be used to rapidly estimate source parameters and provide important applications on seismogeodesy.
|Effective start/end date||1/08/20 → 31/10/21|
- high rate GPS
- static coseismic offset
- Smoothness Priors Method
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