The Kunlun Fault is a major active left-lateral strike-slip fault to the north side of Tibet. Slippage along the 1,500-kilometre-long (930 mi) fault has occurred at a constant rate for the last 40,000 years. This has resulted in a cumulative offset of more than 400 metres (1,300 ft).[1] The fault is seismically active, most recently causing the magnitude 7.8 2001 Kunlun earthquake.[2] It forms the northeastern boundary of the elongate wedge of the Tibetan Plateau known as the Bayan Har block.[3]