Figure 7
From: New approach to detect seismic surface waves in 1Hz-sampled GPS time series
Comparison of the time-frequency estimates of a) Seismic data and b) GPS Data.
Time-frequency amplitudes are calculated using the s-transform46 (resolution factor = 1) and are normalized using the maximum amplitude for each frequency near the event arrival time. Relative arrival times of the peak amplitudes (c) are picked from both seismic and GPS data. Good correlation is found in the 15–50 second (0.015–0.07Hz) period band.
