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We are pleased to share this important publication The Impact of Nepal’s 2015 Gorkha Earthquake-Induced Geohazards with a wider audience around the world. In the aftermath of the Gorkha Earthquake that hit Nepal on 25 April, ICIMOD joined hands with regional and international experts and institutions to map the positions of landslides and debris flows and where they had blocked river valleys. The information collected by the team was provided directly to the Government of Nepal to assist in relief efforts and was instrumental in the formation of a Geohazards Task Force by the government.
David James Molden
1 min Read
Later, ICIMOD in collaboration with other experts undertook several studies including field surveys, airborne observations, and remote sensing mapping to assess the occurrence and impact of the geohazards induced by the earthquake and its aftershocks. This publication presents the results of this work together with findings from several other related studies.
Panorama images of Langtang Village taken before (October 2012) and after (May 2015) the Nepal earthquake. Photo credit: D. Breashears/GlacierWorks
Results from the study have shown that damage from earthquake-induced geohazards can be considerable, and there is the need to treat geohazards separately since their nature and effects and mitigation and adaptation options are different. Similarly, the secondary effect of the damage from geohazards is likely to be comparatively much higher than that of the direct earthquake impact in terms of loss of livelihoods, blocking of movement of people, goods, and services, and loss of revenue from trade and energy supply.
New data has revealed that the Gorkha Earthquake did not release all of the stress that had built up underground along the Himalayan arc. Due to the residual stress, likelihood of another large earthquake occurring in the future remains. Seismologists say the damage from a possible large earthquake could be much worse.
We hope that the findings and the recommendations provided by the authors in this publication will help policy and decision makers in Nepal and other regional member countries in their efforts to prepare for geohazards and improve geohazard management.
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