Changing significance of landslide Hazard and risk after the 2015 Mw 7.8 Gorkha, Nepal Earthquake

• DOI: 10.1016/j.pdisas.2021.100159
• Publication Date: 2021-03-02T12:26:41Z
• Authors: Nick Rosser; Mark Kincey; Katie Oven; Alexander Densmore; Tom Robinson; Dammar Singh Pujara; Ram Shrestha; Jakub Smutny; Kumar Gurung; Sundup Lama; Megh Raj Dhital
• Keywords: Human settlement

The 2015 Mw 7.8 Gorkha, Nepal Earthquake triggered in excess of 20,000 landslides across 14 districts Central and Western Nepal. Whilst the instantaneous impact these was significant, ongoing effect earthquake on changing potential for rainfall-triggered landsliding months years that followed has remained poorly understood challenging to predict. To provide insight into how evolved since earthquake, it impacted those living affected area, a detailed time-series landslide mapping campaign undertaken monitor evolution coseismic initiation new post-seismic landslides. This supplemented by numerical modelling simulate future reactivation runout as debris flows under monsoon rainfall, identifying locations potentially at risk. analysis shows hazard higher November 2019 compared immediately after with considerable portion landscape being landsliding. We show that, while pre-existing continued pose majority aftermath significant number also occurred locations. discuss value this type informing reconstruction management settlements risk summarizing work integrated project Durable Solutions II, supported communities from Finally, we consider such data could be used inform sensitive land-use planning disaster recovery, mitigate impacts beyond.