ALOS emergency observations by JAXA for monitoring earthquakes and volcanic eruptions in 2008

In 2008, many disasters occurred in different places around the world. Remote sensing technique contributed significantly to observing and monitoring those disasters that occurred in remote locations. The ALOS satellite has observed the entire world using three sensors since its launch, thus providing important results soon after disasters strike. By comparing optical images or SAR amplitude images acquired before and after the disaster, we can identify surface changes associated with earthquakes or volcanic eruptions. Such information helps us evaluate risks of second disasters. InSAR observation detected crustal deformation associated with earthquakes, and the geodetic information helped us to understand fault mechanisms.