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Mount Hood, the nearest major volcanic peak in Oregon, is 60 miles (100 km) southeast of Mount St. Helens. Mount St. Helens is geologically young compared with the other major Cascade volcanoes. It formed only within the past 40,000 years, and the summit cone present before its 1980 eruption began rising about 2,200 years ago. [ 11 ]
After Newberry Volcano, Mazama is the second largest Quaternary volcanic edifice in Oregon, and the most voluminous, [30] with an overall volume of 29 cubic miles (120 km 3). [31] Mazama is the newest of the Quaternary calderas in the Cascade Volcanic Arc, which also include the Newberry calderas and the caldera at the Medicine Lake Volcano ...
The recent eruptive activity at Belknap Crater means that it is one of the youngest mafic volcanoes in the Oregon Cascades. [ 55 ] There are about 6,500 people living within 19 miles (30 km) of Belknap Crater, with a population of about 362,000 within 62 miles (100 km). [ 3 ]
The volcanic field is named for the town of Boring, Oregon, located 12 miles (20 km) southeast of downtown Portland and on the edge of the densest cluster of volcanic vents. The zone became volcanically active about 2.7 million years ago, with long periods of eruptive activity interspersed with quiescence. Its last eruptions took place about ...
Axial Seamount is the youngest volcano and current eruptive center of the Cobb–Eickelberg Seamount chain, a chain of seamounts that terminates south of Alaska. [6] Axial lies where the chain intersects with the Juan de Fuca Ridge , [ 7 ] approximately 480 km (298 mi) west of Oregon.
The Alaska Volcano Observatory is closely monitoring Mount Spurr, which is located about 75 miles west of Anchorage. “AVO continues to monitor activity at Mount Spurr for signals that would ...
Mount Hood is considered the Oregon volcano most likely to erupt. [8] The odds of an eruption in the next 30 years are estimated at between 3 and 7%, so the U.S. Geological Survey (USGS) characterizes it as "potentially active", but the mountain is informally considered dormant .
The Sand Mountain Volcanic Field (also known as the Sand Mountain Field) is a volcanic field in the upper McKenzie River watershed, located in the United States in Oregon. Part of the Cascade Volcanic Arc , it lies southwest of Mount Jefferson and northwest of Belknap Crater and Mount Washington .