COMPARISON OF COSEISMIC DISPLACEMENTS OBTAINED FROM STRONG MOTION ACCELEROGRAMS AND GPS DATA IN JAPAN
Strong motion seismometers and GNSS (Global Navigation Satellite System) earth observation networks cover uniformly the region of Japan. Since the availability of such amount of information is rare in other countries, good opportunity to compare coseismic displacements from acceleration records and GPS data is provided. Two events were chosen in this study: the 11 March 2011 MW9.0 Tohoku earthquake and the 11 April 2011 MW6.6 Fukushima Hamadori earthquake, which was an induced event by the previous one. Since the baseline in an acceleration record showed a shift and it changed in time during an event, this study investigated several baseline correction methods proposed in other studies. Strong motion and GPS stations were selected from the two events and coseismic displacements evaluated from GPS data and acceleration records were compared.