Abstract
Global Navigation Satellite System (GNSS) is recognized as an effective tool to retrieve high-precision seismic displacements, which has been widely used in earthquake early warning systems such as magnitude estimation and fault slip inversion. In this study, we present two multi-GNSS positioning models for rapidly capturing real-time coseismic displacements using the raw pseudorange, carrier phase and Doppler measurements, called constant velocity (CV) and constant acceleration (CA) dynamic precise point positioning (PPP) models, respectively. The proposed methods are validated with the datasets collected during the 2019 July 4 Mw 6.4 and July 6 Mw 7.1 earthquakes in real-time scenarios. Results show that the two models can provide accurate displacement waveforms with the accuracy of few centimeters. Besides, the multi-GNSS integration can significantly improve the model performances compared with GPS-only solutions in both time- and frequency- domains. The dynamic PPP models can also reliably recover the moment magnitudes and permanent seismic displacements, indicating that the methods have the potential to benefit for earthquake early warning and rapid geohazard assessment.
Highlights
The 2019 July 4 Mw 6.4 and July 6 Mw 7.1 earthquakes occurred in eastern California, southwest of Searles Valley, which are caused by the shallow strike-slip faulting in the crust of the North America plate [1]
Taking the multi-Global Navigation Satellite System (GNSS) station P616 during the Mw 6.4 earthquake as a case, Fig. 3 shows the estimated displacements derived from the conventional kinematic, constant acceleration (CA) and constant velocity (CV) dynamic Precise point positioning (PPP) models in the 3 h interval from 16:00:00 to 19:00:00 UTC on July 4, 2019
The high-rate GNSS observations recorded during 2019 July 4 Mw 6.4 and July 6 Mw 7.1 Earthquakes near Ridgecrest, California are used to analyze the capability of Global Positioning System (GPS) and the benefit of multi-GNSS for rapid determining precise displacements
Summary
The 2019 July 4 Mw 6.4 and July 6 Mw 7.1 earthquakes occurred in eastern California, southwest of Searles Valley, which are caused by the shallow strike-slip faulting in the crust of the North America plate [1]. INDEX TERMS Dynamic PPP, multi-GNSS, magnitude, permanent displacements, positioning precision.
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