News28 February 2011 Satellite imagery of the February 22 earthquake in Christchurch, New Zealand. |
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On February 22, 2011, an earthquake measuring 6.3 on the Richter scale struck Christchurch in New Zealand's South Island, causing loss of life and severe damage to the city. Imagery from COSMO-SkyMed and GeoEye-1 satellites is helping to analyse the consequences. Optical imagery (GeoEye-1)The GeoEye-1 image at right shows some of the most serious damage in the centre of the city: the fallen spire of the Cathedral, the collapsed CTV building, the Grand Chancellor Hotel, the tallest building in the city, leaning at a dangerous angle. Radar Imagery (COSMO-SkyMed)The next set of images are derived from pairs of COSMO-SkyMed Strip HImage acquisitions acquired with the same geometry (i.e.: same orbit pass, look direction, incidence angle, polarisation, acquisition mode). The loss of coherence in the image pairs is evidence of changes on the ground. The Interferogram Map shows fringing most probably associated with seismic activity. The Coherence Change Analysis Map is derived from the difference between a pre-seismic pair (3/19 February 2011) and a co-seismic pair (19/23 February), showing where the loss of cherence is greatest. All data processed and distributed by e‑GEOS. Information and imagery on this site will continue to be updated in the coming days. Further informationChristchurch Quake Map |
Click on images below for larger versions |
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