Thanks to data available from the GEO Geohazards Supersite initiative (http://supersites.earthobservations.org/sendai.php), TRE has been able to perform an analysis to extract ground displacement over the area affected by the Japanese earthquake occurring on 11th March 2011. Using ENVISAT S6 data, descending track 347, a co-seismic interferogram was produced using two radar satellite images from 16th February and 21th March. The processed area is approximately 650×75 sqkm. Each visible fringe (a complete colour cycle ranging from red, through the colour spectrum, back to red again) refers to ground movement on the order of 2.8cm in the satellite line of sight (LOS).
The figure below shows our co-seismic interferogram:
Background image © Google Earth
Download the .kmz image file from Google Earth