Ground deformation related to active faults detected by persistent scatterer InSAR

We conducted a persistent scatterer interferometry of SAR images acquired by ALOS/PALSAR to reveal ground deformation related to the movement of active faults. We analyzed 20 and 15 images covering the Kyoto, Nara and Osaka plains from the ascending and descending paths, respectively, during the period from October 2006 to October 2010. We obtained uplift of about 1 cm/yr in the southern part of Kyoto basin and 5mm/yr subsidence along the Arima - Takatsuki Tectonic Line fault zone. The uplift region in south Kyoto is clearly bounded by two active faults. On September 3, 2010, a Mw 7.1 earthquake hit South Island of New Zealand. Though no active faults had been identified before its occurrence, clear surface ruptures appeared. We apply time series analysis to the 17 ascending images acquired during January 2007 to August 2010 and found gradient of LOS change in the E-W direction, suggesting strain accumulation in the source region.