Feasibility of Remote Sensing for Multihazard Analysis of Landslides in Padang Pariaman during the 2009 Padang Earthquake
Natural Hazards Review
The M w 7.6 Sumatra earthquake that occurred on 30 th September 2009 resulted in very large landslides in the regency of Padang Pariaman, in West Sumatra. The UK based Earthquake Engineering Field Investigation Team (EEFIT) was dispatched to conduct a field survey of the effects of the earthquake, including the landslides that affected the region. As part of the mission, the feasibility of using remote sensing to determine vulnerability to landslides was assessed. Comparison of coordinates
... of coordinates between the collected GPS readings in the field, ASTER and Google TM Earth DEMs and SPOT-5 satellite imagery showed reasonable spatial and elevation differences which indicates the suitability of remote sensing for landslide hazard assessments. Deterministic slope stability model analysis with SINMAP also indicated high susceptibility of slope instability at these landslide sites. These locations however, were demarcated as moderate risk regions in the local landslide hazard map. Considering the high lethality of these landslides, this underestimate of the risk is a strong argument for a review of landslide risks using a methodology that considers the combined effects of earthquake and rainfall as evident in this earthquake event.