The caldera measures 8x10 km in diameter and is filled with a lake of up to 600 m depth. It's an azure jewel in south-central Oregon, and with a depth of 1,949 feet, it has the distinction of being the deepest lake in the country. Based on information from volcanoes around the world we know that eruptions that follow long periods (thousands of years) of quiet at individual volcanoes can be quite large magnitude. It is located 97 km NW of Klamath Falls, OR.

In November of 1990, Newberry National Volcanic Monument was created within the boundaries of Deschutes National Forest. Crater Lake is located within the collapsed caldera of Mount Mazama on the crest of the Cascade Range in southern Oregon about 90 km (55 mi) north of the city of Klamath Falls and about 100 km (60 mi) northeast of Medford. One of the most iconic volcano’s in the state of Oregon is Crater Lake.

Mount Mazama is one of the major volcanoes of the Cascades Arc. Tephra Fall Hazards Around Crater Lake, Oregon Tephra fall can occur from an explosive eruption from either Crater Lake or any of the volcanoes in the area. The cross-sectional views of the layers of lava flows and pyroclastic deposits reveal that most of Mount Mazama was built up by lava that was fed from low- level l ava fountains. U.S. Geological Survey Scientific Investigations Report , 2017-5022-J, 3 p. Geologic Maps


Here’s how to take a trip around Southern Oregon to see it for yourself: Crater Lake: Formed by the collapse of an ancient volcano Mt. Exploring the Newberry Crater (which is technically a caldera) is a wonderful way to learn about and see firsthand the violent, geological history that helped make Central Oregon the beautiful place it is. Crater Lake in the southern Cascade Range of Oregon, USA, is one of the most beautiful calderas in the world. Double the view with a short side trip up to Scott Lake , which mirrors these ragged peaks.

You’ll be treated to more outstanding volcano views, this time of North Sister and Middle Sister. Layers of lava flows from these volcanoes are visible in the caldera walls and in landmarks along the south rim of Crater Lake, including Applegate and Garfield Peaks. (Diagram from grrebs.ete.inrs.ca ) It formed by the collapse of a massive stratovolcano known as Mount Mazama about 6850 years ago.

Before the ‘eruption’, Lake Nyos was beautiful and blue.

When you look at the deep blue waters of Crater Lake up close, it’s pretty easy to see why it’s one of the 7 Wonders of Oregon. Overview for geologic field-trip guides to Mount Mazama, Crater Lake Caldera, and Newberry Volcano, Oregon.


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