Fig. 4
From: Visualizing heterogeneities of earthquake hypocenter catalogs: modeling, analysis, and compensation
Magnitude differences of ISC and USGS magnitudes against JMA magnitude MJMA in the Japan area. Magnitude differences a MJMA–Mb, b MJMA–mb of the same earthquakes in ISC body wave magnitude Mb and USGS body wave magnitude mb, respectively, relative to the JMA magnitude (1973–2005), c smoothed surfaces of Mb–MJMA on the plane of MJMA, d shows the same as c, replacing Mb with mb. Contours show an equidistance of 0.1 magnitude unit differences of the smoothed surface, and higher magnitudes differences are shown in purple (in contrast to light blue). The vertical solid lines in a–d show changes of the magnitude difference pattern in the range where plots were highly changed