Broadband Velocities and Displacements From Integrated GPS and Accelerometer Data for High-Rate Seismogeodesy

Abstract

We present a new method of integrating Global Positioning System (GPS) and accelerometer data for high-rate seismogeodesy. This method is based on the GPS variometric approach which can obtain seismic waves in real time using only the readily available broadcast products and a single receiver. Collocated 1-Hz GPS and 200-Hz accelerometer data from the 2016 MW 7.8 Kaikōura earthquake were analyzed to verify the effectiveness of this method. Results reveal that this method can provide broadband and more accurate velocities and displacements qualified to detect P wave arrivals. Moreover, this method can effectively avoid the aliasing problem present in the 1-Hz GPS waveforms. We therefore conclude that this new method can be a powerful tool to capture seismic waves in real time, which is crucial for the purpose of tsunami early warning and earthquake rapid response.