It has recently been suggested that the Tseax eruption was related to the Cascadia earthquake of 26 January 1700 . This was the most powerful earthquake during the last 1000 years in the Pacific Northwest . If this theory is substantially correct , then another hazard must be added to those risks associated with major megathrust earthquakes
Cascadia earthquake of 26 January 1700
1700 Cascadia earthquake
Tseax Cone