Earth movements from Japan earthquake seen from space

Several scientists collaborated to collect satellite imagery and produce a so-called interferogram to show ground movement happened with the Japan 9.0 quake

ESA

These first results, covering an 800 km-long strip over Sendai and Tokyo, show movement far away from the epicentre (denoted by the red star in the top image) in the Pacific Ocean. The complex technique being used by the scientists is known as ‘InSAR’ – synthetic aperture radar interferometry. It combines before and after radar images of the same ground location from the same position in space in such a way as to detect ground motion down to a few millimetres.

It's possible to download the interferogram. This initiative signs a milestone in international research:

This disaster marks the first time that multiple space agencies – ESA, the German Aerospace Center and the Japan Aerospace Exploration Agency – are openly providing SAR data for understanding tectonic processes under the GeoHazard Supersites initiative, coordinated by the Group on Earth Observations.

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