Comparison of high-rate GPS,strong-motion records and their joint use for earthquake monitoring: a case study of the 2011 Mw 9.0 Tohoku earthquake

We explore the use of high-rate GPS, strong-motion records and their joint use for earthquake monitoring, the data collected during 2011 Mw 9.0 Tohoku earthquake was studied. We compared the recorded co-seismic movement, analyzed the displacements in both time-frequency domain. Meanwhile, the comparison of P wave detection was shown and the dynamic velocity waves were discussed. The results suggest that the GPS-only solution is good for low-frequency signal, and the strong-motion-only solution is good for high-frequency signal, thus, the integration of two datasets best complement the advantages of each, more details of co-seismic motions and broader frequency band of seismic signals. This is crucial for earthquake monitoring and early warning.