Fig. 3.

Examples of observed waveforms (black lines) and the corresponding synthetics (red lines) computed from the updated W phase solution. The station azimuth (ϕ) and epicentral distance (Δ) are indicated, as well as the W phase time window, bounded by red dots. W phase and later arrivals are often very well predicted by the updated solution. For some channels like INCN-LHZ or TATO- LHZ, the surface waves are affected by instrument problems, though the W phase signal is not affected.