The August 21, 1949 M8.1 earthquake off #HaidaGwaii ruptured a nearly 500-km-long segment of the Queen Charlotte Fault ("Canada's San Andreas Fault"). The average slip along the fault was about 5 m. This earthquake was followed by hundreds of aftershocks.https://t.co/V3ecgshWLwpic.twitter.com/XchzDTaT3j