An earthquake occurred on 31 May 1935 between 2:30 am and 3:40 am at Quetta, Balochistan, British India, close to the border with southern Afghanistan. The earthquake had a magnitude of 7.7 Mw and anywhere between 30,000 and 60,000 people died from the impact. It was recorded as the deadliest earthquake to strike South Asia until 2005. The quake was centred 4 km south-west of Ali Jaan, Balochistan, British India.
The Chappar Rift in Balochistan, a landmark railway site, was affected by the 1935 earthquake, when the mountains opened up in parts. The gorges and rifts owe much to this earthquake for their appearance