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| 2015 Gorkha earthquake | |
|---|---|
| Name | 2015 Gorkha earthquake |
| Magnitude | 7.8 M_w |
| Depth | 8.2 km |
| Date | 2015-04-25 |
| Local time | 11:56 NST |
| Epicenter | near Barpak, Gorkha District, Nepal |
| Affected | Nepal, India, China (Tibet), Bangladesh, Pakistan |
| Casualties | ~8,964 dead, 22,300+ injured |
| Aftershocks | numerous, including M7.3 on 2015-05-12 |
2015 Gorkha earthquake was a major seismic event that struck central Nepal on 25 April 2015 with widespread effects across South Asia. The earthquake struck near Barpak in Gorkha District and produced catastrophic damage in the Kathmandu Valley, surrounding districts, and transboundary impacts in India, China (Tibet), Bangladesh, and Pakistan. International organizations, national agencies, and local institutions mobilized large-scale humanitarian, search-and-rescue, and reconstruction responses.
The earthquake occurred within the convergent boundary between the Indian Plate and the Eurasian Plate, a setting that has produced historic events such as the 1934 Bihar earthquake, the 1950 Assam–Tibet earthquake, and the uplift of the Himalayas. The region is characterized by major structures including the Main Himalayan Thrust, the Mahananda Fault, and subsidiary thrusts that accommodate shortening through shallow crustal rupture, similar to mechanisms documented for the 2005 Kashmir earthquake and inferred from geological mapping by institutions like the Geological Survey of India and the Nepal Geological Society. Long-term strain accumulation since prior major events, crustal flexure beneath the Tibetan Plateau, and plate convergence rates measured by GPS campaigns contributed to the seismic hazard that culminated in the 2015 rupture.
The mainshock was a shallow thrust faulting event on the Main Himalayan frontal structures, with a moment magnitude of 7.8 reported by the United States Geological Survey and interoperable seismic networks including the International Seismological Centre and regional observatories such as the Nepal Seismological Centre. The rupture propagated east-northeast from the epicenter, producing surface deformation recorded by InSAR satellites, Global Positioning System stations operated by the National Aeronautics and Space Administration and the Chinese Academy of Sciences, and seismic waveform analyses by the European-Mediterranean Seismological Centre. Energy release and fault slip were consistent with modeled scenarios for large Himalayan earthquakes, and focal mechanism solutions aligned with oblique-thrust faulting on the plate interface. A significant M7.3 aftershock on 12 May further modified stress fields and caused additional damage.
Human tolls were concentrated in central districts such as Kathmandu District, Gorkha District, Dhading District, and Sindhupalchok District, with casualties also reported in Indian states like Bihar, Uttar Pradesh, and Sikkim, and Chinese regions including Tibet Autonomous Region. Estimates of fatalities and injuries were compiled by the Nepalese Army, the Nepal Red Cross Society, and international agencies including United Nations Office for the Coordination of Humanitarian Affairs and World Health Organization, while migrant and diaspora communities in India, United Kingdom, and United States followed developments through ministries and consular networks such as the Ministry of Foreign Affairs (Nepal). Landslides triggered by the event buried villages and blocked arterial routes used by Nepal Police and search-and-rescue teams.
The earthquake caused catastrophic damage to urban infrastructure in the Kathmandu Valley, including collapsed hospitals, schools, and cultural landmarks such as the Kathmandu Durbar Square, Bhaktapur Durbar Square, Patan Durbar Square, the Swayambhunath stupa, and the Boudhanath stupa. Historic palaces, medieval temples, and UNESCO World Heritage Sites suffered partial or total collapse, prompting assessments by the International Council on Monuments and Sites, the World Monuments Fund, and national bodies like the Department of Archaeology (Nepal). Lifelines including the Tribhuvan International Airport, road corridors such as the Araniko Highway, hydropower installations, and water-supply networks were disrupted, complicating logistics for relief operations coordinated by agencies like the Asian Development Bank and the World Bank.
Immediate responses combined local capacities—district administrations, the Nepal Army, Nepal Police, and civil-society organizations—with international search-and-rescue teams from countries including India, China, United Kingdom, United States, Japan, and Australia. Humanitarian coordination was led by the United Nations Resident Coordinator and OCHA, while relief logistics used hubs such as Tribhuvan International Airport and staging areas managed by the Nepalese Army and Indian Army contingents. Donor pledges and technical assistance flowed from multilateral institutions—the World Bank, the Asian Development Bank, and the International Monetary Fund—and bilateral partners including the European Union, United States Agency for International Development, and Japan International Cooperation Agency. Non-governmental organizations like Oxfam, Save the Children, and the International Federation of Red Cross and Red Crescent Societies provided shelter, sanitation, and health services.
The mainshock was followed by a dense sequence of aftershocks recorded by the Nepal Seismological Centre, the USGS, and regional seismic networks; notable among them was the 12 May M7.3 event with its own suite of strong aftershocks. Aftershock distributions illuminated fault segments of the Main Himalayan Thrust and nearby secondary thrusts, informing short-term seismic hazard assessments by academic groups at institutions such as Columbia University, Massachusetts Institute of Technology, and the University of Cambridge. Ongoing seismic monitoring, GPS campaigns, and paleoseismic studies by the Geological Survey of India and universities aimed to refine recurrence intervals and probabilistic seismic-hazard models for future risk reduction.
Post-disaster recovery encompassed debris removal, retrofitting and rebuilding of housing, restoration of heritage sites, and upgrades to infrastructure standards driven by policy reforms within the Government of Nepal and technical guidelines from the United Nations Development Programme and World Bank. Reconstruction financing combined domestic budgets, international loans, and grant assistance from partners such as the Asian Development Bank and bilateral donors; implementation involved local municipalities, provincial authorities, and civil-society organizations. Lessons emphasized the need for earthquake-resistant construction standards promoted by the National Reconstruction Authority (Nepal), improved early warning and preparedness measures advocated by institutions like the International Seismological Centre and the Global Earthquake Model Foundation, and integration of seismic risk reduction into urban planning in Kathmandu and other rapidly urbanizing centers. Continued scholarly work in seismology, structural engineering, and heritage conservation at centers including ETH Zurich, University College London, and the Indian Institute of Technology informed both technical best practices and policy dialogues for resilience building.
Category:Earthquakes in Nepal Category:2015 disasters in Nepal