Mapping of post-event earthquake induced landslides in Sg. Mesilou using LiDAR

• Published in: IOP Conference Series: Earth and Environmental Science
• Main Author: Yusoff H.H.M.; Razak K.A.; Yuen F.; Harun A.; Talib J.; Mohamad Z.; Ramli Z.; Razab R.A.
• Format: Conference paper
• Language: English
• Published: Institute of Physics Publishing 2016
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84984633815&doi=10.1088%2f1755-1315%2f37%2f1%2f012068&partnerID=40&md5=e155058ef846d97cf5d8008747b03036

Earthquake is a common natural disaster in active tectonic regions. The disaster can induce cascading disasters such as debris flow, mudflow and reactivated old landslides. M 6.0 Ranau earthquake dated on June 05, 2015 coupling with intense and prolonged rainfall caused several mass movements such as debris flow, deep-seated and shallow landslides in Mesilou, Sabah. This study aims at providing a better insight into the use of advanced LiDAR mapping technology for recognizing landslide induced by earthquakes particularly in a vegetated terrain, assessing post event hazard and analyzing its distribution for hazard zonation. We developed the landslide inventory using LiDAR-derived visual analysis method and validated in the field. A landslide inventory map improved with the support of LiDAR derivative data. Finally, landslide inventory was analysed by emphasizing its distribution and density in such a way that it provides clues of risky zone as a result of debris flow. We recommend that mitigation action and risk reduction should be taken place at a transport zone of the channel compared to other zones. This study indicates that modern airborne LiDAR can be a good complementary tool for improving landslide inventory in a complex environment, and an effective tool for rapid regional hazard and risk assessment in the tropics.