Observation Results of ALOS/PALSAR Relating to the Magnitude 7.0 Earthquake in Haiti (2)
On January 12, 2010 (UTC), a magnitude 7.0 earthquake occurred in the Republic of Haiti, in the Caribbean. The Japan Aerospace Exploration Agency (JAXA) performed an emergency observation on January 25 using the Phased Array Type L-band Synthetic Aperture Radar (PALSAR) installed on the Advanced Land Observing Satellite (ALOS) to determine the state of damage caused by the earthquake. In this report, we compare PALSAR amplitude images taken before and after the earthquake to detect collapsed buildings in inhabited areas including the capital city of Port-au-Prince and conduct differential interferometric SAR (DInSAR) analysis to detect crustal deformation associated with the earthquake using the data acquired on March 9, 2009.The red and blue rectangles indicate observation areas shown in Figure 2 and Figure 5, and the red star represents the epicenter.
1. Detection of Damaged Area
Reddish or bluish areas in this image indicate change of backscatter for the period, so there is a possibility that some kind of surface change occurred in these areas.If the radar backscattering weakens after the earthquake, the red-colored image acquired before the earthquake are enhanced in the composite image. Therefore, reddish parts of an inhabited area may correspond to collapses of buildings.
2. Detection of Crustal Deformation
JAXA plans to continue ALOS observations of the afflicted area in Haiti.