Application of Radar Interferometry for Monitoring the Landslide Creeping of Jiufen Area, Northern Taiwan
Yu-Heng Tai1, Chung-Pai Chang1, 2
1Institute of Geophysics, National Central University, Jhongli,32001 Taoyuan
2Center for Space and Remote Sensing Research, National Central University,
Jhongli,32001 Taoyuan

Abstract
Taiwan is located between southeastern of Eurasian plate and the Philippine Sea plate.
The convergence of these two plates causes quickly uplift and earthquakes. Besides,
typhoons bring high and violent rainfalls while monsoon bring continuous and
abundant precipitations. With such extreme tectonic and weather condition, Taiwan
becomes one of the most active landslide areas in the world. Landslide is a type of
material motion triggered by gravity. It destroys manmade structures and kills human
being, causing a lot of hazard and economical loss in the recent years. Therefore,
detection and monitoring of landslide and creeping thus play an important role in risk
management and help us decrease the damage from such mass movement. Jiufen,
which is one of the famous tourist place in northern Taiwan, has been determined as a
creeping area in previous studies. In this study, we apply Interferometric Synthetic
Aperture Radar (InSAR) techniques at Jiufen to monitor the creeping of slope. InSAR
observations are obtained from ENVISAT, which were launched by European Space
Agency (ESA), spaning from 2004 to 2008. Persistent Scatterer InSAR (PSInSAR)
method is also applied to reduce the phase contributed from atmosphere and
topography and helps us get more precise measurement. As the result, creeping
velocity, about 5 mm/yr, along Line of Sight (LOS) direction has been measured. We
compare the result with previous studies carried out by fieldwork to confirm the
possibility of InSAR techniques applying on landslide monitoring. Moreover, the
time-series analysis helps us to understand the motion of the creeping along with time.
With InSAR result and fieldwork survey, we would have more useful information for
geological interpretation of this area.

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