A magnitude 6.8 earthquake strikes the Hindu Kush region, killing at least 848 people in Afghanistan, Pakistan and present-day Tajikistan.

The 1991 Hindu Kush earthquake severely affected Afghanistan, Pakistan and the USSR on 1 February. It was an intermediate-depth earthquake with a hypocenter 143.2 km (89.0 mi) beneath the Hindu Kush mountains in Afghanistan. The shock measured 6.8 on the moment magnitude scale and had a maximum Mercalli intensity of X (Extreme). The reverse-faulting earthquake occurred in a seismically active region associated with faulting within a deforming oceanic plate at depth.

The Hindu Kush is an 800-kilometre-long (500 mi) mountain range in Central and South Asia to the west of the Himalayas. It stretches from central and eastern Afghanistan into northwestern Pakistan and far southeastern Tajikistan. The range forms the western section of the Hindu Kush Himalayan Region (HKH); to the north, near its northeastern end, the Hindu Kush buttresses the Pamir Mountains near the point where the borders of China, Pakistan and Afghanistan meet, after which it runs southwest through Pakistan and into Afghanistan near their border.

February 1 is the 32nd day of the year in the Gregorian calendar; 333 days remain until the end of the year.