Rain and Earthquake-Induced Landslides in West Java']Java, Indonesia, Case Study in Subang Area Near the Baribis Fault, with Implications for an Early Warning System

This paper presents the role of rainfall and earthquakes as the factors that induces landslides. Case study is conducted at Cikamiri Village, Subang, Province of West Java, Indonesia. Study area close to active faults (Baribis Fault) at the western part of the Subang region. These areas include the landslides prone area. In the relationship between slope safety factors with horizontal seismic coefficient, the results obtained that increasing horizontal seismic coefficient, decreasing slope safety factor. Slopes in rainy season conditions are more prone to landslides than in the dry season. In the rainy season, when coefficient of horizontal seismic is 0.41 or slightly lower than 0.41, the slope indicates an unstable condition. Research in rainy seasons with precipitation 321.62 mm, causing Safety Factor is in critical condition (FS = 1.07). If rain is approaching 321.62 mm, the slope began to critical. On precipitation 364.72 mm causing groundwater levels increased by 72.50 %, followed by. (unit weight), c (cohesion), and phi (angle of friction) at 15.833, 6,571 kN/m(2), and 19.92 degrees, respectively, which ultimately determines the security factor FS to be 1.02 (slope in unstable conditions). Results of this study can be used for EWS (Early Warning System).