Fig. 2
From: Anelastic properties beneath the Niigata–Kobe Tectonic Zone, Japan
a Distribution of hypocenters. Gray circles denote 8300 earthquakes used for estimates of corner frequencies, while colored circles represent 4718 out of 8300 earthquakes for which the corner frequency could be estimated. Circle colors correspond to earthquake focal depths. b Distribution of seismograph stations (white squares) and horizontal grid nodes (blue crosses)