Studying the Queen Charlotte-Fairweather fault
Laboratory collaboration to study earthquake hazards off southeast Alaska and western Canada
USGS scientists and colleagues from the Geological Survey of Canada (GSC), University of Calgary, Sitka Sound Science Center, and U.S. Forest Service spent a week in February at GSC laboratories in British Columbia investigating earthquake hazards posed by the Queen Charlotte-Fairweather fault. They examined dozens of sediment cores collected during a September 2017 research cruise along the fault, which ruptured in at least six major earthquakes during the past century. GSC personnel have spent months analyzing the sediment cores’ physical properties; the group that met in February extracted nearly 500 sediment samples to be dated using radiocarbon analysis and other methods. Knowing ages of sediment layers will help the scientists analyze recurrence intervals of earthquakes and submarine landslides to better estimate quake and tsunami hazards associated with the fault.