a Map with stations used (green triangles) and the focal mechanism corresponding to the best solution found. b Plot of focal mechanism solutions in an RMS versus depth graph. c Waveform fit, in displacement (cm) bandpass filtered between 0.03 and 0.08 Hz. Observed records are in gray and computed in red. For each station the three components are displayed (N, E, Z), and “vel” or “acc” (blue labels) means that the original record was in velocity (broadband) or acceleration (strong motion), respectively.