Landslide Prone Areas

Landslide is one of prominent geohazards that continuously affecting Indonesia, especially in the rainy season. It destroys not only environment and property, but usually also cause deaths. Landslide monitoring and mitigation is therefore very crucial and should be done continuously. One of the methods that can have a contribution in studying landslide phenomena is repeated GPS survey method. Repeated GPS survey method can be used to precisely detect land displacements on the landslide prone area. This paper will present and discuss the operational performances and results of GPS surveys conducted in a well know landslide prone area in West Java (Indonesia), namely Ciloto, the hilly region along Bandung-Jakarta highway. Several techniques, geodetic and geotechnical have been utilized to study the characteristics of land movements in this area. Three GPS surveys involving 17 GPS points have been conducted, namely on 21-22 January 2002, 4-5 April 2002 and 10 May 2003, respectively. The results of GPS surveys show that the magnitudes of land movements in the study area vary from cm to dm level, depending on the location and the observation period in relation with rainy and dry seasons. The paper will also discuss the constraints faced by GPS survey method in the landslide prone area environment, which is usually hilly and sloping sharply. TS16 Deformation Measurements and Analysis