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Posts tagged Cascade Volcanic Arc

Hood River Between Mount Adams and Mount Hood, USA

46.2N 121.4W

January 20th, 2011 Category: Mountains, Rivers, Volcanoes

USA - December 25th, 2010

This orthorectified image stretches from Washington State to Oregon, USA. Situated by the top edge is Mount Adams, a potentially active stratovolcano in the Cascade Range and the second-highest mountain in the U.S. state of Washington. Adams is a member of the Cascade Volcanic Arc, and is one of the arc’s largest volcanoes.

Flowing along the lower edge of the thumbnail is the Hood River, is a tributary of the Columbia River in northwestern Oregon. Approximately 25 miles (40 km) long from its mouth to its farthest headwaters on the East Fork, the river descends from wilderness areas in the Cascade Range on Mount Hood and flows through the agricultural Hood River Valley to join the Columbia River in the Columbia River Gorge.

Mount Hood, can be observed south of the river in the full image. It is a stratovolcano in the Cascade Volcanic Arc of northern Oregon. It is the highest mountain in Oregon and the fourth-highest in the Cascade Range. The peak is home to twelve glaciers.

Crater Lake in Mount Mazama Caldera, USA

42.9N 122W

January 18th, 2011 Category: Lakes, Volcanoes

USA - December 25th, 2010

This orthorectified image focuses on Mount Mazama, a destroyed stratovolcano in the Oregon part of the Cascade Volcanic Arc and the Cascade Range. The volcano’s collapsed caldera holds Crater Lake, and the entire mountain is located within Crater Lake National Park.

Mazama was destroyed by a volcanic eruption that occurred around 5,677 (± 150) BC. The eruption reduced Mazama’s approximate 14000 ft height by around a mile (1600 m). Much of the volcano fell into the volcano’s partially emptied neck and magma chamber. At 8,159 feet (2,487 m), Hillman Peak is now the highest point on the rim.

Mount Shasta and Trinity and Shasta Lakes, USA – January 3rd, 2011

41.3N 122.3W

January 3rd, 2011 Category: Image of the day, Lakes, Mountains, Volcanoes

USA - December 25th, 2010

Mount Shasta, located at the southern end of the cascades in Siskiyou County, California, rises to an altitude of 14,179 feet (4,322 m) in the upper right corner of this orthorectified image.

It the second highest peak in the Cascades and the fifth highest in California. Mount Shasta also has an estimated volume of 85 cubic miles (350 km3) which makes it the most voluminous stratovolcano in the Cascade Volcanic Arc.

In the full image, two artificial reservoirs can be seen south of the volcano: Lake Shasta (right) and Trinity Lake (left). The former was created by the construction of Shasta Dam across the Sacramento River, while the latter was formed by the Trinity Dam on the Trinity River.

The Three Sisters Volcano Cluster in Oregon, USA – May 15th, 2010

44.1N 121.7W

May 15th, 2010 Category: Image of the day, Mountains, Volcanoes

USA - April 28th, 2010

USA - April 28th, 2010

The cluster of volcanoes in the upper half of this orthorectified image are known as the Three Sisters. They are three volcanic peaks of the Cascade Volcanic Arc and the Cascade Range in Oregon, each of which exceeds 10,000 ft (3,048 m) in elevation.

The volcanoes have the third, fourth, and fifth highest peaks in the state of Oregon and are located in the Three Sisters Wilderness, about 15 mi (24 km) southwest from the nearest town of Sisters, Oregon. The three peaks have 15 named glaciers among them, nearly half of all the 35 named glaciers in Oregon.

The Three Sisters are the centerpiece of a region of closely grouped volcanic peaks which form an exception to the typical 40-mile (64 km) to 60-mile (97 km) spacing between volcanoes elsewhere in the Cascades. Nearby peaks include Belknap Crater, Broken Top and Mount Bachelor, with Three Fingered Jack and Mount Washington somewhat to the north.

Mount St. Helens in the Cascade Volcanic Arc, USA

May 12th, 2010 Category: Mountains, Volcanoes

USA - April 28th, 2010

USA - April 28th, 2010

Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States, visible just below the center of this orthorectified image.

Mount St. Helens is most famous for its catastrophic eruption on May 18, 1980, at 8:32 am PDT which was the deadliest and most economically destructive volcanic event in the history of the United States.

The volcano is located in the Cascade Range and is part of the Cascade Volcanic Arc, a segment of the Pacific Ring of Fire that includes over 160 active volcanoes. This volcano is well known for its ash explosions and pyroclastic flows.

As with most other volcanoes in the Cascade Range, Mount St. Helens is a large eruptive cone consisting of lava rock interlayered with ash, pumice, and other deposits. The mountain includes layers of basalt and andesite through which several domes of dacite lava have erupted. The largest of the dacite domes formed the previous summit, and off its northern flank sat the smaller Goat Rocks dome. Both were destroyed in the 1980 eruption.

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