2:00 PM - 2:15 PM
[SSS16-13] Construction of GNSS monitoring system in Nepal for the earthquake potential evaluation in the Himalayan Frontal Zone
Keywords:Nepal, Earthquake, GNSS
In paralle to the station construction, we collect all available GNSS data in Nepal and process them using PPP-AR method of GIPSY/OASIS II ver.6.4. Total number of stations is less than 10 as of 2004 and gradually increased year by year. Since the 2015 Gorkha earthquake, many stations have been added in and around the Kathmandu Valley. However, the number of stations where stable data collection is still ongoing may be less than 30. The result shows that roughly N-S contraction of about 0.1 ppm/yr is significant over the whole of the country, implying that about half of the relative Indian-Eurasian plate motion (36-37 mm/yr) is taken up in crustal shortening of the Himalayan frontal zone due to strong coupling on the plate boundary. Occurrence of the 2015 Gorkha earthquake disturbs deformation field in the source region in central Nepal but does not seem to affect further west. It means that large amount of strain has remained unreleased in “Central Seismic Gap”. We need to cope with high potential of earthquake generation in this region in the near future. New SATREPS NERDiM GNSS stations will contribute to enhance spatio-temporal resolution of the deformation field in the region concerned.