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.
23 Οκτ 2023 · Mount Mazama is one of the major volcanoes of the Cascades Arc. 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.
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.
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.
1 Νοε 2006 · The Cascade arc volcano known as Mount Mazama collapsed during its climactic eruption of ∼50 km 3 of mainly rhyodacitic magma ∼7700 yr ago to form Crater Lake caldera.
6 Δεκ 2022 · Comments: the largest explosive volcanic eruption in the past 400,000 years in the Cascades. Highlights: World-renowned classic caldera; spectacular compositionally zoned caldera-forming eruption; eruptive history well displayed in caldera walls
