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We analyse both the broad‐band SH wave and long‐period mantle wave seismograms from the 2003 September 25, Tokachi‐Oki earthquake, to investigate its source process. We find that the previously published long‐period solution is likely to represent an overestimation of the size of the earthquake and that the earthquake is more likely to have had a moment of 2.18 × 1021 N m (Mw 8.2) rather than the...