Time series deformation analysis of Lumpur Sidoardjo (Lusi) mud volcano using interferometry synthetic aperture radar

Speaker: Teguh Purnama Sidiq
On 29 May 2006, mud along with other fluid and gas material erupted close to a gas exploration well in Porong Sidoardjo, East Java Indonesia. The eruption that last for more than four years comes with unique deformation pattern. We use 68 L-Band ALOS PALSAR images, which divide into five frames, and generate 443 interferograms. Linear inversion is performed to get the deformation change within a period of each interferogram. The inversion result showed the maximum deformation ~31 cm near the eruption center during the period from June 2006 to October 2009. An ellipsoidal pattern is clearly visible from the interferogram although the closest point adjacent to main eruption cannot be detected. The closest area to the main eruption is covered by mud and water that leads interferogram to poor coherence. Field observation of crack signature around the eruption area shows the same deformation pattern. Another deformation pattern is also observed in the North West side from main eruption. Time series deformation shows that range change acceleration is slower from time to time. In this study, the linear inversion yields a good pattern of the deformation, but cannot accommodate high deformation acceleration which occurs in the first month of the eruption.