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Measurement of long-term deformation by InSAR using ALOS/PALSAR data

Tomonori Deguchi(1), Yuichi Maruyama(1) and Masatane Kato(1)

(1) ERSDAC, 3-12-1 Kachidoki Chuo-ku, Tokyo 104-0054, Japan


Huge amount of muddy water were erupted around the natural gas well located at Porong, East Java in Republic of Indonesia on May 29th 2006. The outburst of great amount of muddy water induced a large-scale ground subsidence, which inflicted significant damage to the infrastructure such as highways, railroads and high-voltage lines that support the industrial foundation of the area. In this study, the authors conducted InSAR processing using ALOS/PALSAR data and tried to measure surface displacement caused by mud eruption. InSAR processing using PALSAR data detected land deformations in four areas. First anomaly is a deformation in the vicinity of the natural gas well. Fringe meaning deformation away from the satellite densely appeared, indicating that a huge subsidence had taken place. The largest amount of subsidence was approximately 1.4 m in slant-range direction. The second is a deformation detected in the northwest of the subsidence around natural gas well. The maximum amount of deformation was approximately 8 cm. Natural gas production existing in this area is assumed to have given substantial effects on the ground deformation. The third is an uplift detected in the eastern part of the subsidence around natural gas well. The largest amount of uplift was approximately 25 cm. Finally, a small spatial-scale subsidence is appeared in the southwest of natural gas well. As the area is the shelter for people who lost their houses by mud eruption, this subsidence was considered to be caused by the withdrawal of a large volume of groundwater from shallow aquifer to secure the daily life water (laundry, shower, lavatory, etc.) for the displaced people.


Workshop presentation

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry