Fig. 6

Estimated decadal-scale slow slip acceleration prior to the Tohoku-Oki earthquake [6]. a Distribution of slow slip acceleration on the plate interface after inverting GPS position time series accelerations. Colors indicate the magnitude, and vectors indicate the direction of slow slip acceleration. Black contours represent the coseismic slip distribution of the Tohoku-Oki earthquake [3]. b GPS position time series at station 0036 (Onagawa). The black curves show the east component time series after removing common-mode errors, the red curves show postseismic transient model fits, and the blue and green curves show fits obtained after removing offsets and postseismic transients, respectively. Vertical broken lines mark the times of detected antenna offsets (black) and earthquakes (red). Initial linear trends have been removed