Nearly 500 cores were collected from the postglacial giant crater lava field on the south flank of medicine lake volcano. Mount mazama giiwas in the native american language klamath is a complex volcano in the state of oregon united states in a segment of the cascade volcanic arc and cascade range most of the mountain collapsed following a major eruption approximately 7 700 years ago.
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The volcano is in klamath county in the southern cascades 60 miles 97 km north of the oregon california border.
Eruption medicine lake volcano. The basaltic lavas form a continuous set of lava flows which display strong chemical zonation from initially erupted calc alkaline basaltic andesite to final primitive basalt of tholeiitic affinity. Shield volcano 2 414 m 7 921 ft. It rises about 1 200 m 3 900 ft above the modoc plateau and under the centre of the volcano the underlying rock has been pushed down by 0 5 km 0 3 miles.
Eight eruptions produced about 1 3 cubic miles 5 3 km 3 of basaltic lava during a time interval of a few hundred years about 10 500 years ago. California canada and usa mainland 41 58 n 121 57 w. That eruptive episode was followed by a hiatus that ended with a small andesitic eruption about 4 300 years ago.
The caldera may have formed by collapse after a large volume of andesite was erupted from vents along the caldera rim. Although 1 cm of ash may seem a very small amount experience with mount st. It contains a 12 km x 7 km wide caldera.
Aerial view west across the upper part of medicine lake volcano toward mount shasta on the horizon. Medicine lake is in the caldera of the volcano which measures 4 3 by 7 5 miles 7 by 12 km. Medicine lake volcano eruptions.
Medicine lake volcano has erupted lavas of widely varying composition ranging from basalt to rhyolite. Medicine lake lies within the shallow basin of medicine lake caldera. Glass mountain flow erupted 950 years ago is outlined in the foreground.
1910 1080 890 100 830 800 720 50 bc 780 bc 100 1080 bc 50 2410 bc 100. At medicine lake volcano there is a 1 in 5 000 chance of an eruption producing enough tephra to accumulate to 1 cm 0 4 in thick in any given year. During the past 11 000 years eruptive activity at medicine lake volcano has been episodic.
The largest eruption of medicine lake during the past 11 000 years produced a massive basaltic lava flow from giant crater about 10 600 years ago. Medicine lake volcano is a shield volcano that in main has erupted dry haot high alumina olivine tholeiite and hydrous calcalkaline basalts simultaneously but also some andesitic magma. Helens eruptions indicates that as little as 0 5 cm 0 2 in of ash is sufficient to slow vehicle traffic to a crawl and to close businesses for as much as a week or two.
Glass mountain flow draped over the east side of the volcano is the youngest lava flow at the volcano. Medicine lake is a large shield volcano in northeastern california about 50 km 30 mi northeast of mount shasta rising about 1 200 metres 3 900 ft above the modoc plateau to an elevation of 2 376 metres 7 795 ft.
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