What type of cone is mount hood

Illumination Rock in the foreground. Credit: Howle, James F. Public domain. Mount Hood, which has been active for at least , years, occupies a long-lived focus of volcanic activity that has produced ancestral Hood-like volcanoes for the past 1. Much of the Mount Hood edifice is formed of lava flows, but eruptive activity during the past 30, years has been dominated by growth and collapse of near-summit lava domes to produce broad fans of pyroclastic flow deposits.

Similar deposits were probably formed in Mount Hood's past but were largely eroded, especially during ice ages, and are poorly represented in the geologic record. The last two periods of eruptive activity occurred about 1, years ago and in the late 18th century. In addition to Mount Hood, other volcanoes scattered through the nearby area have erupted during the past , years.

In contrast to the long-lived activity at Hood, each of these regional volcanoes was active for a relatively short period of time. The youngest such volcano is the 7-km-long Parkdale lava flow whose vent lies about 12 km north-northeast of the summit of Mount Hood. Gnarl Ridge lava flows from about ka at base to ka at top, Mount Hood, Oregon eastern flank.

Credit: Scott, Willie. The broad flanks of Mount Hood cover an area almost 20 km Each sequence comprises multiple flows tens of meters to locally more than meters thick. Some sequences cover broad sectors; others are relatively narrow and were probably buttressed by glaciers significantly larger than those we see today. While the Mount Hood edifice was growing, regional volcanoes of chiefly basalt and basaltic andesite lava flows formed.

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Further reproduction and use of without authorization is usually not consented. Credit: Stovall, Richard. Public domain. Mount Hood is Oregon's highest peak and an active volcano of the Cascade Range. It is located about 80 km 50 mi east of the Portland metropolitan area. Volcanism occurs at Mount Hood and other Cascades arc volcanoes because of the subduction of the Juan de Fuca Plate off the western coast of North America. Mount Hood is a long-lived volcanic center that has erupted recurrently during the past , years, and geologic evidence records eruptions from a similar volcano at about the same site back to more than one million years ago.

In fact, geologic studies of the Mount Hood region have identified products of numerous local volcanoes that post-date the great floods of basalt lava the Columbia River Basalts that flowed down ancestral valleys of the Columbia River between about 16 and 15 million years ago. Local volcanoes have ranged from long- lived andesitic to dacitic volcanoes similar to Mount Hood to relatively short-lived outpourings of basalt and basalticandesite that built shield volcanoes and cinder cones.

Image of the Day Land Snow and Ice. Image of the Day Atmosphere Land Volcanoes. EO Explorer. Mount Hood, Oregon. At the time of publication, it represented the best available science. View more Images of the Day:.