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Volcanic
Volcanic Event Summary
The eastern boundary of the Cascade Range is within 150 miles of Morrow County. The Cascade Range has been an active volcanic area for about 36 million years as a result of the convergence between the North American and Juan de Fuca crustal plates. According to most interpretations, volcanism in the Cascades has been discontinuous in time and space, with the most recent episode of activity beginning about 5 million years ago and resulting in more than 3,000 vents. This activity is observable today as scientists monitor closely ongoing activity at Mount. St. Helens in Washington, the South Sister in Oregon, and other locations.
History of Volcanism in Morrow County:
As evidenced by all of the basalt that underlies Morrow County, this region has been mightily influenced by volcanic activity. Despite the scary image of liquid basalt flowing over the central basin area, there has been no such activity since more than 15 million years ago. Today, any risk to Morrow County is perceived as coming from the volcanic Cascade Range to the west. There is no history of volcanic impacts in Morrow County, although volcanic history in the wider region, notably the Mt. St. Helens eruption in 1980, does show that a volcano could affect the County if a volcano in the Cascade Range were to erupt.
