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Mount Shasta and Surrounding Volcanic Peaks, California USA

41.3N 122.3W

July 29th, 2009 Category: Volcanoes

USA - July 16th, 2009

USA - July 16th, 2009

A series of volcanoes are visible in this orthorectified image, the most prominent of which is Mount Shasta, in the top left corner. Mount Shasta is a stratovolcano and the second-highest peak in the Cascade Range, at 14,179 feet (4,322 m).

The mountain consists of four overlapping volcanic cones which have built a complex shape, including the main summit. What remains of the oldest of Shasta’s four cones is exposed at Sargents Ridge on the south side of the mountain. Lava from the Sargents Ridge vent covers the Everitt Hill shield at Shasta’s southern foot.

The newest and highest cone is called the Hotlum Cone, named after the Hotlum glacier on its northern face; its longest lava flow, the 500 feet (150 m) thick Military Pass flow, extends 5.5 miles (8.9 km) down its northwest face.

One prominent cone, Shastina, is a 12,330-foot (3,760 m) high satellite cone. The fourth and final cone is exposed south of Shasta’s current summit and is called Misery Hill.

Mount Shasta, California, USA

41.3N 122.3W

July 1st, 2009 Category: Volcanoes

California, USA - June 30th, 2009

California, USA - June 30th, 2009

This orthorectified ASAR (radar) image shows Mount Shasta, a 14,179-foot (4,322 m) stratovolcano that is the second-highest peak in the Cascade Range and the fifth highest peak in California. It is a member of the Cascade Volcanic Arc and is located in Siskiyou County.

Mount Shasta is not connected to any nearby mountain; as can be seen here, it rises abruptly from miles of level ground which encircle it, standing nearly 10,000 feet (3,000 m) above the surrounding area.

Mount Shasta has an estimated volume of 108 cubic miles (450 km3), making it the most voluminous stratovolcano in the Cascades.

The mountain consists of four overlapping volcanic cones which have built a complex shape, including the main summit and the prominent satellite cone of 12,330-foot (3,760 m) Shastina, which has a visibly conical form. If Shastina were a separate mountain, it would rank as the third-highest peak of the Cascade Range.

Mount Shasta’s surface is relatively free of deep glacial erosion except, paradoxically, for its south side where Sargents Ridge runs parallel to the U-shaped Avalanche Gulch. This is the largest glacial valley on the volcano, although it does not presently have a glacier in it.