March 28, 2005 Sumatra Earthquake Coastal Changes in Nias Island and Banyak Islands

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The additive process between red (R,G,B) = (100%,0%,0%) and cyan (R,G,B) = (0%,100%,100%) results in white (R,G,B) = (100%,100%,100%）. First, convert colors in radar images from gray-scale in image before the earthquake to red-scale and from gray-scale in image after the earthquake to cyan-scale. Second, the additive process between the red-scale and the cyan-scale results in gray-scale, red-scale and cyan-scale at unchanged area, area where backscatter decreased, and area where backscatter increased.

	Before earthquake Radar image	After earthquake Radar image	Comparison image Coastal change
O r i g i n a l			An area colored in cyan in the image below is a region where the reflective intensity is increased due to emergence.
C o n v e r t e d
	2005-02-04	2005-04-15	After additive process
Ti de	-10cm	-4cm

2005 earthquake pushes up cluster of 10 new islands. The emergence had increased the size of small islets and even produced more than ten new small islets. The length of the maximum islet is approximately 1.5 km.