The GNSS network of Japan, which is known as GNSS Earth Observatoin Network System (GEONET-Japan) and operated by the Geospatial Information Authority of Japan, consists of more than 1200 continuously observing GNSS stations, covering the Japanese land area with 20 km average distance between neighborouring GNSS sites. The Mw9.0 earthquake of Tohoku on 2011 March 11 was fully recorded by GEONET and GPS records of 847 GEONET stations of 15-hour duration and 1 Hz sampling rate, covering the period of the earthquake, were available. The GPS records have been processed using the scientific Bernese GPS Software 5.2 in post-process Precise Point Positioning mode using a priori information of highest quality from the Center of Orbit Determination in Europe (CODE). This dataset is the 1 Hz GPS coordinate time-series, as the result of the post-process solution, in north, east and up components. The 1 Hz GPS time-series cover 7-hour period prior, during and after the Tohoku Mw9.0 2011 earthquake.