Global Positioning System (GPS) coordinates from before and after the 2003 8.0-magnitude Tokachi-Oki earthquake in Japan were used to estimate the slip distribution on the plate boundary. The GPS data revealed a maximum co-seismic slip of approximately five meters near the quake's offshore epicenter, which agree with other displacement estimates. Existing GPS networks in Japan are encouraged to continue to measure co- and post-seismic slip distribution around the plate boundaries.
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