The map above simulates a 300-kiloton nuclear airburst over Bangkok, Thailand — roughly the size of a modern deployed warhead. The coloured rings show the estimated fireball, the zones of heavy, moderate and light blast damage, the reach of the thermal flash and the ionizing-radiation dose. Drag the marker or change the weapon in the full simulator to explore other scenarios.
The metropolitan area is home to about 11 million people — the rings above are drawn to real scale over their homes.
The marker is on Rattanakosin Island, the old royal city. The 1.9 km zone of total destruction covers the Grand Palace, Wat Pho, Sanam Luang, Khao San Road and Wat Arun across the river; the 4.7 km collapse ring reaches Chinatown, the Democracy Monument, Dusit Palace and Thonburi's riverbank. Third-degree burns extend to about 7.5 km over Hua Lamphong station, Siam Square, the Victory Monument and Khlong Toei; the 14.5 km ring of broken windows reaches Sukhumvit, Silom and Sathorn, Chatuchak Market, Don Mueang's approach and Bang Khae.
Greater Bangkok has about 11 million inhabitants on a flat river delta barely above sea level. The Chao Phraya winds through the rings but is too narrow to absorb much; the modern business districts to the east are high-rise, the old city low and dense. Thailand has no nuclear weapons, and Southeast Asia is a nuclear-weapon-free zone under the 1995 Bangkok Treaty, signed in this city. See Nuclear arsenals.
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