Learning from the April 25, 2015, Nepal earthquake:
Mapping the deformation and site response


Learning from earthquakes:  Every earthquake offers a learning experience, enabling researchers to be prepared for future events. So is the recent pair of large earthquakes that shook parts of Nepal and the northern Indian plains. Even at the face of the tragedy that an earthquake brings along, earthquake scientists must prepare themselves to go through its effects on natural settings as well as built environment.  The April 25th and May 12th, 2015 earthquakes in Nepal present themselves as the two major post-instrumentation era events in the Himalayan region and they provide an unprecedented opportunity to study the earthquakes in relation to the seismotectonic settings of the Himalayan convergence. Besides, these also provide templates to revisit the historically documented earthquakes and their effects in this region that has witnessed many events in the past. Through a specific project to facilitate field studies and learning from the earthquake effects, the Ministry of Earth Sciences and the Indian Institute of Science, have provided us the opportunity to learn from the actual effects of a large Himalayan earthquake. This brief report presents our preliminary observations during the field trip through the north Indian plains of UP and Bihar to parts of Nepal that were affected by the earthquake. Our observations are presented in the general background of the seismotectonic setting of the Himalaya.



Earthquake locations for the Mw 7.8 April 25th  event, the Mw 7.3 May 12th event and their corresponding aftershock effects.




Route map followed by the team during the course of the field work.




The dilapidated Dharara, Kathmandu ( P.C. : Matthew Wood)




For further details, visit the link:




Survey team from IISc:

Prof. Kusala Rajendran (Associate Professor at CEaS, IISc)

-          kusala@ceas.iisc.ernet.in

Thulasiraman N (Ph.D student at CEaS, IISc)

-          thulasiraman@ceas.iisc.ernet.in

Revathy Parameswaran (Ph.D student at CEaS, IISc)

-          revathyparameswaran@ceas.iisc.ernet.in

Rishav Mallick (M.Tech student at CEaS, IISc)

-          mallickrishg@ceas.iisc.ernet.in


Collaborative participants:

Prof. C.P. Rajendran (Scientist G, NCESS; Faculty, JNCASR)

-          cprajendran@gmail.com ; rajendran@jncasr.ac.in

Matthew Peter Wood (Ph.D student at University of Melbourne)

-          mwood3@student.unimelb.edu.au



This report was prepared by:-


Revathy M. Parameswaran (Ph.D student at CEaS, IISc)

Thulasiraman N (Ph.D student at CEaS, IISc)

Rishav Mallick (M.Tech student at CEaS, IISc)


-          With inputs from Prof. Kusala Rajendran, Dr C.P. Rajendran and Matthew Peter Wood.




The post-earthquake survey by the IISc team at Nepal and Northern India was supported by the Ministry of Earthsciences and the Indian Institute of Science Bangalore. We acknowledge help from Sunil Kupperi and Harsh Lekhak at Nepal. Furthermore, we particularly thank Matthew Wood, who is also a professional photographer, for the vivid shots featured in this report.