1949 Queen Charlotte Islands earthquake
Canada's largest earthquake recorded by seismometers, the 1949 Queen Charlotte Islands earthquake struck Haida Gwaii and the Pacific Northwest coast at 8:01 p.m. PDT on August 21. The earthquake had a moment magnitude of 8.0 and a surface wave magnitude of 8.1. The maximum Mercalli Intensity in the event was VIII (Severe). No deaths were reported in this earthquake.
1902 Turkestan earthquake
The 1902 Turkestan earthquake (also known as the Artux/Artush and Kashgar earthquake) devastated Xinjiang, China, near the Kyrgyzstan border. It occurred on August 22, 1902, at about 8:00 or 9:00 am local time with an epicenter near the Tien Shan mountains. The thrust earthquake measured 7.7 on the moment magnitude scale (Mw) and initiated at a depth of 18 km (11 mi). Additional shocks were recorded over a decade after the mainshock. An estimated 5,650-10,000 people were killed in the mainshock. Widespread destruction occurred - at least 30,000 homes were destroyed.
Henry Bachtold was born
Henry Bachtold was an Australian soldier and railway engineer. Bachtold commanded the engineers of the 5th Australian Division in 1917-18 and the engineers of the 3rd Australian Division in 1918. Later he was appointed as the Railways' Assistant Chief Civil Engineer, Workshops in July 1946.
Henry Maudslay was born
Henry Maudslay was an English machine tool innovator, tool and die maker, and inventor. He is considered a founding father of machine tool technology. His inventions were an important foundation for the Industrial Revolution. Maudslay's invention of a metal lathe to cut metal, circa 1800, enabled the manufacture of standard screw thread sizes. Standard screw thread sizes allowed interchangeable parts and the development of mass production.
