Fig. 4.

Horizontal coordinate time series (a, b); time series after removing the linear trend (c, d) of GPS sites (named on the right side of the black solid lines) in NWV in ITRF2008. Vertical solid lines mark the 2004 Sumatra and the 2011 Tohoku earthquakes. Open circles denote the positions of the east and north components before removing the predicted far-field coseismic offsets of these earthquakes. Solid circles show the positions after removing the predicted far-field coseismic offsets caused by the 2004 Sumatra earthquake. Open rectangle shows the positions after removing the predicted far-field coseismic offsets caused by both earthquakes. At the figure scale, Solid circles are covered by open rectangles after 2011. Black solid lines are the best fitting lines for temporal changes of the horizontal coordinates with the correction of the coseismic offsets of the earthquakes. The coordinate uncertainties are shown with a 95% confidence level.