Manjil-Rudbar Earthquake

In the early hours of 21 June 1990, a magnitude 7.4 earthquake struck northern Iran, devastating the provinces of Gilan and Zanjan and parts of Qazvin. It is among the deadliest earthquakes of the late twentieth century. Estimates of the death toll generally fall around 40,000 (some sources give figures a little higher or lower), and hundreds of thousands of people were left injured or homeless. The towns of Manjil and Rudbar, close to the epicenter, gave the disaster its name.

The region sits within the broad zone of collision between the Arabian and Eurasian plates, which produces frequent seismic activity across Iran. The Alborz mountains, which curve along the Caspian coast, are shaped by this compression. Northern Iran had experienced destructive earthquakes before, and much of the housing in the affected area was vulnerable. Many rural and small-town buildings were made of unreinforced brick, adobe, or masonry with heavy roofs, which tend to collapse catastrophically in strong shaking. The area also includes steep valleys and olive groves, where villages were often built on slopes prone to landslides.

The earthquake struck shortly before local midnight, when most people were indoors and asleep, which contributed to the heavy casualties. The rupture occurred along faults in the Alborz range and was strong enough to produce visible surface breaks. Shaking triggered landslides that blocked roads and cut off communities, hampering the first rescue efforts. Manjil and Rudbar were severely damaged, as were the city of Rasht and many villages. The Sefidrud Dam near Manjil, a major structure, survived the shaking, a fact often noted in later engineering discussions.

Iran mounted a large national relief effort, and many countries and international organizations sent aid, rescue teams, and supplies. The disaster came shortly after the end of the Iran-Iraq War and during a period of relative diplomatic isolation, and the foreign assistance it drew was notable in that context. Reconstruction of housing and infrastructure took years, and some survivors were relocated to new settlements.

The earthquake had lasting effects on how Iran approached seismic risk. It strengthened the case for enforcing building codes, studying active faults, and investing in emergency preparedness. Progress was uneven, and later disasters, such as the 2003 Bam earthquake, showed that vulnerable construction remained widespread. The Manjil-Rudbar earthquake endures as a reminder of how the combination of tectonic hazard and fragile buildings can turn a natural event into a human catastrophe.