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31 Jan 2001 description

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).

26 Jan 2001 description

The red line in the picture of "After the Earthquake (January 26, 2001)" is of noise. The color and brightness of each picture are adjusted in different ways for comparison, so that they do not show the measured value.

Also see analysis map "Estimated Damage Based on Nighttime Satellite Images - Gujarat India"