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Welcome To… Crater Lake National Park Southwest Oregon, USA Brendan Hunt Evan Halloran Main Points • Tectonic Setting • Regional History • Scale of Eruption Write ‘em down. Location • Southwest Oregon • Located on the Ring of Fire – Most volcanically active area on Earth • Located on plate boundary – Pacific and North American plates What’s that? Tectonic shifting? YES! Tectonic Setting • Subduction • Three substantial plate shifts – 200M years ago – 165M years ago – 35M years ago • 35M years ago – Shift occurred out at sea – Parallel to previous shift – Resulting chain of volcanoes blew pyroclastic material east - aiding in the buildup of sediments Activity • • • • 35M – 25M years ago Relatively dormant for 13M Awakes 1M years later Around 1M years ago Mt. Mazama is formed Mt. Mazama • Began to form around 1 million years ago! – Young in comparison to area • 12,000 ft. above sea level • 10,000 ft. after glacial retreat Eruption • 8,000 years ago • Massive • Mount St. Helens 1980 eruption = weak – Mt. Mazama eruption was 42 times stronger • Blew off around 2,000 ft. of the summit • Ash carried hundreds of miles – Into Canada, eh? Crater Lake….IS BORN • Cone collapse – Material blows out • Crater forms • Magma Oozation – Fills in cracks • H2O fills in crater Voila! Crater Lake. THE END