Αποτελέσματα Αναζήτησης
Crater Lake fills half of the 8- by 10-km-diameter caldera formed during the climactic eruption of Mount Mazama volcano approximately 7,700 years ago. Volcanic rocks exposed in the caldera walls and on the flanks record over
31 Οκτ 2023 · By about 30,000 years ago, Mount Mazama began to generate increasingly explosive eruptions and thick flows of silica-rich rhyodacite lava. The change to more explosive and silica-rich eruptions was an outward sign that a large volume of silicic magma had begun to accumulate deep beneath the volcano.
The geologic history of Crater Lake National Park is an explosive one. Bacon (2008) mapped 111 eruptive units underlying, building up, and ejected out of Mount Mazama, not to mention the Mazama ash that blew out of the volcano and was transported by wind far across the landscape.
Crater Lake fills half of the 8by 10-km-diameter caldera formed during the climactic eruption of Mount Mazama volcano approximately 7,700 years ago. Volcanic rocks exposed in the caldera walls and on the flanks record over 400,000 years of eruptive history.
1 Δεκ 2002 · A new 1:24,000-scale digital geologic map compiled in ArcInfo depicts the geology of this volcanic center, peripheral volcanoes, the caldera walls and floor, and superjacent pyroclastic, talus,...
23 Οκτ 2023 · The massive volcano erupted violently 7,700 years ago, accompanied by collapse of the entire upper half of the edifice. Prior to its climactic eruption Mount Mazama had a summit elevation of about 3,700 m (12,000 ft). The present high point is Mount Scott at 2,721 m (8929 ft), 3 km (about 2 mi) east of the caldera rim.
6 Δεκ 2022 · Mount Mazama, although its presence across the landscape lacks an exposed summit, is ranked 17th among the 161 potentially most dangerous volcanoes. About 4,800 years ago, a viscous rhyodacite dome nearly breached the lake surface. This is the youngest eruption product that has yet been recognized.
