TerraSAR-X image of the month: Movements of the Earth's crust in Haiti during the earthquake of 12 January 2010
2 February 2010
The image shows movements in the Earth's crust caused by the earthquake in Haiti on 12 January 2010. The colour scale shows the extent of the displacements, from green for small displacements to deep red for movements of two metres. The red-coloured area north of the Enriquillo fault zone (red line) was displaced by about 80 centimetres during the earthquake, in the direction of the oblique radar view. This corresponds to a horizontal movement of about 1.3 metres to the west. The rapid drop in the deformation from west to east, over a distance of only a few kilometres – shown by the gradient from red to green – indicates a stretching of the Earth’s crust in this area.
Movements in the Earth's crust caused by the earthquake in Haiti on 12 January 2010.
The measurements were obtained by a correlation comparison of two TerraSAR-X radar images, acquired on 18 February 2009 and 14 January 2010. The colours indicate the amount of movement and the arrows indicate the direction.
Due to the satellite's orbit and the Earth's rotation, the geometry of the radar images is turned about 12 degrees counterclockwise. The accuracy of the measurement technique lies within a range of 30 centimetres. Because of the 30-kilometre width of the TerraSAR X image strip, the measurements are limited to the coloured area.
The TerraSAR-X mission
TerraSAR-X is the first German satellite that has been manufactured under what is known as a Public-Private Partnership (PPP) between DLR and Astrium GmbH in Friedrichshafen. The satellite travels around Earth in a polar orbit and records unique, high-quality X-band radar data about the entire planet using its active antenna. TerraSAR-X works regardless of weather conditions, cloud cover or the absence of daylight and is able to provide radar data with a resolution of down to one metre.
DLR is responsible for using TerraSAR-X data for scientific purposes. It is also responsible for planning and implementing the mission as well as controlling the satellite. Astrium built the satellite and shares the costs of developing and using it. Infoterra GmbH, a subsidiary company founded specifically for this purpose by Astrium, is responsible for marketing the data commercially.