Figure 8

The blue curve shows the East position time series at station CONZ around the time of the 2010 Maule earthquake (see Fig. 1). Note that the coseismic offset has been removed from the time series and that the gap corresponding to the passing of seismic waves has been filled with zeros. The blue horizontal dashed lines show the noise level (i.e., the mean of the time series before the earthquake plus and minus 3.3 times the standard deviation of the time series, also calculated from the time series before the earthquake). The vertical dashed line is the earthquake origin time. The red line is the time evolution of the Chow-test statistic (χ) The red horizontal dashed line is the threshold to identify potential ties when significant postseismic deformation might occur. Finally, the detection time is validated if the peak is located after the earthquake origin time and is more than 70% of the time series after the peak remains outside the noise level. For instance, on this figure, significant postseismic deformation is detected ~41 minutes after the earthquake.