Nath is known to have studied the seismic activities in the Himalayan region including the earthquakes in Nepal in April and May 2015 and has contributed to developing novel applications of geotomography. He has been involved in a number of government-sponsored project studies which included Seismic Hazard Microzonation and Evaluation of Vulnerability & Risk of Sikkim Himalaya, Guwahati Megacity, Urban Kolkata and Kashmir Valley project of the Ministry of Earth Sciences, National Programme in Earthquake Engineering Education in India of the Ministry of Human Resource Development, National Programme for Capacity Building of Engineers in Earthquake Risk Management of the Ministry of Home Affairs and the National Earthquake Risk Mitigation Programme of the National Disaster Management Authority. His studies have been documented in several peer-reviewed articles; Google Scholar and ResearchGate, online repositories of scientific articles, have listed 122 and 93 of them respectively. He is the author of the Seismic Microzonation Manual and Seismic Microzonation Handbook published by the Ministry of Earth Sciences and the editor of Training Handbook for the Faculty of the State Resource Institutions, a reference manual for capacity building in earthquake risk management published by the Ministry of Home Affairs, the former two are prescribed texts for academic education in India. Besides, he is the author of Schlumberger Geoelectric Sounding in Gro, a text explaining the application of Vertical Electrical Sounding (VES) curves in explorational geophysics. Nath, who has delivered several keynote and plenary addresses at seminars and conferences in India and abroad, is also credited with contributions in the establishment of a strong motion network 16 earthquake monitoring stations in the Himalayan region and two broadband seismological observatories at the Kharagpur and Kolkata campuses of IIT Kharagpur.