Fig. 5.
Depth variation of differences in seismic magnitude differentials mb−Mw for interplate thrust events on the megathrusts near the 2011 Tohoku, 2004 Sumatra, and 2010 Chile great earthquakes. The magnitude differences have been corrected for corner frequency scaling with seismic moment using an ω-squared source model. The mb values are from the USGS PDE bulletin and the Mw values are from the gCMT catalog. Only events in the range 5 ≤ Mw ≤ 6.5 are included to avoid saturation in the mb measurements due to fixed time window. Linear regressions over the depth range 10–60 km give the trends indicated by the dashed lines.