India

Estimated Damage Based on Nighttime Satellite Images - Gujarat, India (31 January 2001)

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Difference in nighttime-light intensity before and after an earthquake can be used to estimate earthquake damaged areas, because it may bring about power outage, evacuation, the slow-down of the economic activities, etc. in earthquake-affected areas. The areas where the nighttime-light intensity became weaker after the earthquake are colored in red and yellow in the map above. The nighttime-light images used here were observed by the DMSP (Defense Meteorological Satellite Program)/OLS (Operational Linescan System).
The gray spots in the map show the areas where the brightness after the earthquake exceeds the measure range of the OLS sensor, and the light intensity difference cannot be figured out in the areas. The pale purple areas in the map show cloud existence where the city lights were influenced and the light intensity difference cannot be figured out in the areas, either.

Also see Nighttime lights satellite imagery