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Bhutan occupies one of the most seismically hazardous positions in Asia, straddling the active collision boundary of the Indian and Eurasian tectonic plates in the eastern Himalayas. The kingdom's dramatic mountain landscape — its greatest aesthetic asset — is also the product of geological forces that continue to release energy in the form of earthquakes, some of considerable magnitude. Successive governments have recognised that seismic risk represents one of the most serious threats to life, infrastructure, and cultural heritage in a country where traditional rammed-earth construction predominates and where historic monuments of irreplaceable significance concentrate in valley floors and hillside sites.

Seismic Hazard

Under the Indian Seismic Code, Bhutan falls predominantly within Zones IV and V — the two highest hazard categories. The Main Central Thrust and associated fault systems running beneath the Himalayan range have generated damaging earthquakes throughout recorded history. The 2009 Bhutan earthquake (magnitude 6.1, centred near Trashigang) caused extensive damage to several historic dzongs and hundreds of rural homes. A subsequent event in 2011 compounded damage to structures already weakened, prompting a national reassessment of building stock vulnerability.

Scenario modelling conducted under international research partnerships has projected alarming outcomes from a major night-time event: at least 9,000 fatalities, approximately 10,000 serious injuries, and the displacement of more than 40,000 people — roughly five per cent of the national population — in a worst-case scenario. These figures underscore the disproportionate exposure of a small, mountainous nation where rural communities are spread across isolated valleys with limited emergency access.

Traditional rammed-earth and stone masonry construction, while culturally significant and thermally efficient, performs poorly under lateral seismic loading. Historic dzongs, temples, and farmhouses — many centuries old — face the greatest structural risk. Their cultural importance makes simple demolition and replacement unacceptable; engineering solutions must reconcile seismic safety with heritage conservation.

Institutional Framework

In 2013, the Royal Government established the National Disaster Management Authority (NDMA) as the nodal agency for disaster risk reduction and emergency response. Disaster Management Committees have been established in all 20 dzongkhags, providing a decentralised coordination structure that can mobilise local resources quickly after an event. The Department of Disaster Management (DDM) maintains a public information portal, coordinates training exercises, and manages national stockpiles of emergency supplies.

The Bhutan Building Regulation 2023 introduced strengthened earthquake-resistance requirements for new construction, incorporating provisions for deep foundations, shear walls, cross-bracing, and the use of ductile materials. Modern commercial and government buildings are designed in accordance with Indian IS 1893 seismic design codes, adapted for local conditions. Enforcement capacity at the local government level remains a challenge, particularly for rural self-build housing outside formal permit systems.

In December 2024, the World Bank approved USD 40 million in financing to strengthen Bhutan's institutional and technical capacity to manage climate change and natural disaster risks. The programme includes investments in early warning systems, hazard mapping, community-level preparedness training, and financial resilience mechanisms for affected households.

Research and International Partnerships

The JICA SATREPS Project (Science and Technology Research Partnership for Sustainable Development) represents the most systematic scientific effort to date to quantify seismic risk in Bhutan. The Japan–Bhutan collaborative research programme evaluated the seismic performance of composite masonry buildings — the construction type most common in Bhutanese towns — and developed practical retrofit guidance for rammed-earth structures that could be applied without compromising traditional aesthetics.

Academic institutions including the College of Science and Technology in Phuentsholing and partnerships with international universities have supported applied research on local building materials and vernacular construction practices. The goal is to develop locally sourced, cost-effective reinforcement techniques that rural builders can adopt without specialised machinery or imported materials. Community awareness campaigns, school-level earthquake drills, and first-responder training programmes complement the technical research agenda.

Earthquake Preparedness in Bhutan

Seismic Hazard

Institutional Framework

Research and International Partnerships

References