The main factor triggering landslide in Timor-Leste is rainfall. Therefore, landslide often occur during the rainy season. However, there is no information on earthquake-induced landslides or combined rainfall, although the tectonic activity cannot be ignored because Timor-Leste is located in a collision region with high seismic intensity. This paper aims to expose the ground instability and slope failure that are commonly triggered by torrential rainstorms and the influence of earthquakes due to topographical changes of the ground level. This is the preliminary study about topography change of the ground due to earthquake with minimum magnitude in Timor-Leste that occurred more than 10 years ago. The LOS (Line-of-sight) displacement obtained from InSAR (Interferometric Synthetic Aperture Radar) analysis shows that the occurrence times of ground deformation and earthquakes are related. Recent landslides triggered by rainfall that occurred on 17 January 2018 clearly show that high precipitation events do not trigger the landslides. On the other hand, the landslide occurred during four consecutive days after it rained, with a gradual increase from 4.2 mm/hour, 10.2 mm/hour, 13.6 mm/hour and 17.8 mm/hour, respectively