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  Latest news from current paleo-seismological research in Nepal

Friday 22 September 2017
Séminaires Physique des Sites Naturels
Soma Nath Sapkota
(DMG/Nepal)
Extrait: 

Quantifying the seismic hazard and return times of large earthquakes along the Himalayan
arc remains a major challenge. Knowing the precise geometry and earthquake rupture histories
of active faults is critical to assessing such hazard. Two great historical earthquakes,
in AD 1934 (M8.2) and AD 1255 (M8), have occurred in Central Eastern Nepal, surface rupture
of those earthquake were reported in Central Nepal. Surface rupture of 1505 earthquake was also
reported at Far-western Nepal. Major portion of the Himalayan Arc is still undiscovered for the
past earthquake. There are still many limitations to discover the surface rupture of historical
and pre-historical mega-thrust earthquake in this region because scale of the co-seismic throw
and limiting depth and paleo-seismological excavations. This makes seismic hazard evaluation
more difficult and challenge. What is the return period of great earthquake in this region
is mostly unclear and different interpretation. To study this problem we have started
paleo-seismological research along the Himalayan front. Thus unambiguous answers to simple
questions are still pending. How complete is the record for M8 earthquakes in the region?
What faults or fault patches generate such earthquakes and which of the corresponding ruptures reach the surface?
This talk will focus on the result from the airborne LiDAR survey along the frontal part of the Main Frontal Thrust (MFT).