For more than 2 years, Spot Image has been tasking the FORMOSAT-2 satellite every month to acquire imagery of the Lusi mud volcano in Java. Two SPOT 5 and 20 FORMOSAT-2 images have been analysed and compared to monitor the volcano’s behaviour, documenting the Indonesian authorities’ efforts to dam and channel the mudflow.

See the full time series of the volcano’s evolution

Since 29 May 2006, a mud volcano has been spewing out a hot, viscous and foul-smelling slurry in the district of Sidoarjo, on the eastern side of the island of Java, Indonesia.
Between 5,000 m3 and 150,000 m3 of mud is erupting from the volcano every day. The mud is coming from a pocket of pressurized hot water 2,700 metres below the surface. As it rises, the water mixes with sediments to form a viscous slurry of mud that is spreading around the volcano crater and forming a peak. Many experts believe it is impossible to tell how long the eruption will last. The volcano could continue spewing mud for years or decades to come.
 
See the detailed site analysis and initial risk assessment
 
 

Spot Image monitors the mud volcano with FORMOSAT-2 The extent of the Lusi mud volcano and the efforts of the Indonesian authorities to contain its inexorable advance convinced Spot Image to monitor it. Risk assessment An archive SPOT 5 image mapped the site’s status before the volcano’s eruption. A 2nd SPOT 5 image captured what was happening 2 months after the eruption began. The first risk assessments indicated that the authorities had an exceptional event on their hands. Spot Image therefore decided to monitor the site. Satellite tasking Spot Image tasked the FORMOSAT-2 geosynchronous satellite to acquire images of the site on a regular basis. For 2½ years, FORMOSAT-2 delivered monthly updates on the volcano’s advance. These images were compared to detect changes and the time series was posted on the Web.