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	Mount Mazama - Wikipedia, the free encyclopedia
		Mount Mazama is a destroyed stratovolcano in the Oregon part of the Cascade Range.
		Mazama's final act started with a large eruption that sent a mile (1.6 km) wide column of hot tephra 5 to 10 miles (8 to 16 km) into the sky at almost twice the speed of sound.
		As with all tephra layers, Mazama ash is thickest near its source (20 feet (6 m)) and becomes thinner with increasing distance from its source (70 miles, 110 km northwest it is 1 foot (0.3 m) thick).
	en.wikipedia.org /wiki/Mount_Mazama (1915 words)

	Mount Mazama (Site not responding. Last check: 2007-11-03)
		Mazama is most famous for a catastrophic volcanic eruption that occurred around 4860 BC and Mazama's ~11 000 foot (~3350 m) height around half a mile (~1 km) when of the volcano fell into the volcano's emptied neck and magma chamber.
		Mazama started to grow 400 000 years in the Pleistocene mainly from large andesite lava flows interbeded with some pryoclastic These early flows averaged 20 to 30 (6 to 9 m) in thickness and to have been emplaced over a few to a few centuries.
		In the end an estimated 11 to mileandsup3 (46 to 58 kmandsup3) of magma from Mazama's magma chamber during this eruptive cycle as approximately mileandsup3 (104 kmandsup3) of tephra (magma is due to high pressure surrounding it).
	www.freeglossary.com /Mount_Mazama (1955 words)

	Crater Lake National Park - Wikipedia, the free encyclopedia
		About 400,000 years ago, Mount Mazama began life in much the same way as the other mountains of the High Cascades, as overlapping shield volcanoes.
		The eruptive period that decapitated Mazama also laid waste to much of the greater Crater Lake area and deposited ash as far east as the northwest corner of what is now Yellowstone National Park, as far south as central Nevada, and as far north as southern British Columbia.
		Mount Scott is a steep andesitic cone whose lava came from magma from Mazama's magma chamber; geologists call such volcano a 'parasitic' or 'satellite' cone.
	en.wikipedia.org /wiki/Crater_Lake_National_Park (1479 words)

	Crater Lake National Park: Nature Notes (2001/2002)
		Mount Scott was named in honor of Levi Scott, a man who explored southern Oregon in the middle of the 19th century.
		Not only is Mount Scott now believed to be a part of a complex of cones that combined to form Mount Mazama, it is possibly the oldest member of this complex.
		Mount Scott, like all other surrounding features, was blasted by avalanches of hot pumice and scoria during the climactic eruption of Mount Mazama.
	www.nps.gov /crla/notes/vol32-33d.htm (1032 words)

	CVO Website - Crater Lake, Oregon
		Mazama was one of the major volcanoes of the High Cascades and is the largest edifice between Mount Shasta and the Three Sisters volcanoes.
		Mount Mazama and Crater Lake caldera lie at the intersection of the Cascade chain of volcanoes with the Klamath graben, a north-northwest trending basin bounded by faults whose displacement is mainly vertical.
		Mount Mazama was constructed during the last approximately 400,000 years by episodic growth of many overlapping shield and composite volcanoes, each of which probably was active for a comparatively brief period (Bacon, 1983).
	vulcan.wr.usgs.gov /Volcanoes/CraterLake/description_crater_lake.html (7500 words)

	Geologic History of Crater Lake.
		Crater Lake partially fills a type of volcanic depression called a caldera that formed by the collapse of a 3,700 m (12,000 ft) volcano known as Mount Mazama during an enormous eruption approximately 7,700 years ago.
		ash devastated the surrounding area, including all of the river valleys that drained Mount Mazama to as far as 64 km (40 mi) away, and a blanket of pumice and ash fell to the northeast of the volcano at least as far as central Canada.
		Mount Mazama was a large composite volcano constructed by episodic growth of many overlapping shield and composite volcanoes, each of which probably was active for a comparatively brief period.
	craterlake.wr.usgs.gov /geology.html (921 words)

	Mount Mazama and Crater Lake: Growth and Destruction of a Cascades Volcano
		Mount Mazama was formed over a period of nearly half a million years by a succession of overlapping volcanoes.
		By about 30,000 years ago, Mount Mazama began to generate increasingly explosive eruptions that were followed by thick flows of silica-rich lava, an outward sign of the slow accumulation of a large volume of highly explosive magma deep beneath the volcano.
		The cataclysmic eruption of Mount Mazama 7,700 years ago started from a single vent on the northeast side of the volcano as a towering column of pumice and ash that reached some 30 miles (50 km) high.
	pubs.usgs.gov /fs/2002/fs092-02 (2297 words)

	A Place Called Oregon - The Disappearance of Mount Mazama (Site not responding. Last check: 2007-11-03)
		Showing how some mountains commit suicide by blowing off their heads, while others behave like Mount Mazama, which undermined its foundations with volcanic explosions, causing such extensive outflows of lava that the entire structure collapsed, and only a hole in the earth was left to mark the place where the Mountain once stood.
		Apparently its childhood and youth were occupied in rearing a volcanic cone; in the prime of life it was a snow-clad mountain peak, sending rivers of ice and detritus down its slopes, and along the valleys to great distances beyond, and indulging at intervals in eruptions.
		He calls up in fancy a state of things in the interior of Mazama, when there was a rise and fall of molten lava, with overflows and escapes of erupted material at points of low level, until so much of the mountain had gone that a general collapse took place, and it sank away.
	gesswhoto.com /mt.mazama.html (2054 words)

	Geology of Crater Lake National Park
		Mount Mazama began to grow almost half a million years ago.
		After the collapse of Mount Mazama, minor eruptions continued inside the newly formed caldera (a word that comes from the Spanish word for “kettle” or “boiler” and is used by geologists to describe large basin-shaped volcanic depressions).
		No volcanic activity has occurred at Mount Mazama in the last 5,000 years; studies of lake sediments show no evidence of magma movement beneath the earth’s surface; and there have been no earthquakes of the kind associated with volcanic activity.
	www.nps.gov /crla/brochures/geology.htm (960 words)

	[No title]
		MAZAMA An extinct volcanic mountain of the Cascade Mountains; its caldera is now occupied by Crater Lake.
		MAZAMA sailed for San Francisco 4 August, arriving on the 24th and departing again on 19 September for the combat area.
		Following her return to the east coast, MAZAMA decommissioned 10 June 1957 at Orange, Tex., where she remained as a unit of the 16th Fleet until 1961.
	www.hazegray.org /danfs/auxil/ae9.txt (841 words)

	Formation of Crater Lake.
		Mount Mazama grew, erupted, then collapsed to form the caldera, and finally precipitation filled the caldera.
		The long history of volcanism at Mount Mazama strongly suggests that this volcanic center will be active in the future.
		Mount Mazama was a large composite volcano that was built during the past 400,000 years by hundreds of smaller eruptions of lava flows.
	craterlake.wr.usgs.gov /formation.html (487 words)

	Peakware - Mount Mazama
		Mount Mazama had the biggest eruption in the last 10,000 years.
		We think its still forming a volcano within the caldera because it was not there before.
		Mount Mazama is still active or dormant because it is growing with the buildup of energy left.
	www.peakware.com /encyclopedia/peaks/addapeak2262.htm (56 words)

	Travel the Volcanic Legacy Byway All American Road in Oregon and California
		Crater Lake, or Mount Mazama, is the least active of these peaks...it has not been active for over 4000 years.
		Shastina, the northernmost peak of Mount Shasta, is a large subsidiary cone that rises to 3,758 meters on the west flank of the compound volcano.
		Introduction to the Geology of the Mount Shasta Region from Dr. William Hirt at College of the Siskiyous in nearby Weed, Califonria.
	www.volcaniclegacybyway.org /volcan.html (877 words)

	Crater Lake National Park Guide on CompassMonkey.com
		However, when Mount Mazama erupted approximately 7,000 years ago, the blast was 42 times greater than that of Mt. Saint Helens.
		The event, which heralded the doom of Mt. Mazama, was the opening of a vent somewhere on the north side of the mountain.
		Local Native Americans witnessed the collapse of Mount Mazama and kept the event alive in their legends.
	www.compassmonkey.com /places/locations.php/26/history (808 words)

	Crater Lake Stratigraphy
		Before the eruption occurred, Mount Mazama had an elevation of around 12,000 feet.
		Mount Mazama was continuing to be built up by lava flows and pyroclastic flows.
		Mount Mazama was somewhat set apart from its sisters because it had many parasitic cones and other eruptions that occurred along its flanks.
	www.ux1.eiu.edu /~cfrbj/parks/mattj/craterl.htm (971 words)

	Abstract from (Site not responding. Last check: 2007-11-03)
		Crater Lake was formed in hte caldera of the collapsed volcano, Mount Mazama.
		Mount Mazama blew its top about 7,700 years ago in southern Oregon in the Cascade Mountain range.
		The eruption at Mount Mazama is said to be 50 times greater than the eruption at Mount St. Helens.
	scidiv.bcc.ctc.edu /rv/abstractsb/sectionb/Habakangas.ncl (259 words)

	Crater Lake National Park, Southwestern Oregon
		It seems probable that the cataclysm in which Mount Mazama disappeared was exceptional; death may have come suddenly, even as expressed in human terms.
		Mount Mazama left a clean-cut rim surrounding the hole through which it slipped and vanished.
		It was through this funnel that Mount Mazama, as men call the volcano that man never saw, once collapsed into the gulf from which it had emerged.
	www.oldandsold.com /articles14/national-parks-35.shtml (3545 words)

	Cascade Peaks: Mount Mazama
		Mount Scott as seen from Discovery Point and from Crater Lake Lodge.
		Mount Scott, the highest point in Crater Lake National Park, lacks 71 feet of being 9000' high; it was formed a geologically short time before the big eruption.
		Mount Shasta and Mount McLoughlin are both visible.
	www.dlmark.net /cmazama.htm (301 words)

	Crater Lake - Oregon :: (Site not responding. Last check: 2007-11-03)
		Prior to its climactic eruption, Mount Mazama's summit had an elevation between 3,300m and 3,700m (somewhere between 10,000 and 12,000 feet).
		Mount Mazama began its climactic eruption about 7,700 years ago, blowing out about 50 square km of magma as pyroclastic materials in a few days.
		Just to imagine what Mount Mazama must of looked like on the day of the catastophic eruption, this huge monsterious mountain exploding in a spectical of fire, lava and smoke.
	www.freewebs.com /nipcraterlake (1258 words)

	USGS: Geological Survey Bulletin 1292 (Results of Recent Eruptions) (Site not responding. Last check: 2007-11-03)
		A recent study of tree rings at Mount St. Helens by David K. Yamaguchi, University of Washington, indicates that this pumice was erupted in A.D. Mount St. Helens as it appears from Mount Rainier.
		Although dwarfed by the tremendous bulk of Mount Rainier, it is a little larger than the cone of the well-known Mexican volcano Paricutin that appeared in 1943 and erupted until 1952.
		Mount Rainier's present summit cone was built within a broad depression at the top of the main volcano that had been formed nearly 4,000 years earlier (fig.
	www.cr.nps.gov /history/online_books/1292/sec3.htm (2298 words)

	Volcano Of The Month
		The summit of Mount Mazama was between 11,000-12,000 feet (3,300-3,700 m) prior to the climatic eruption.
		The history of the volcano is revealed by detailed study of the rocks exposed in the caldera wall and mapping of deposits on the flank of the volcano.
		Bacon, C.R., and Druitt, T.H., 1988, Compositional evolution of the zoned calcalkaline magma chamber of Mount Mazama, Crater Lake, Oregon: Contributions to Mineralogy and Petrology, v.
	www.vulkaner.no /v/volcan/emazama.html (838 words)

	The world's top mount mazama websites
		Mazama is most famous for a catastrophic volcanic eruption that occurred around 4860 BC and reduced Mazama's ~11,000 foot (~3350 m) height by around half a mile (~1 km) when much of the volcano fell into the volcano's partially emptied neck and magma chamber.
		Mazama started to grow 400,000 years ago in the Pleistocene mainly from large andesite lava flows interbeded with some pryoclastic material.
		Then around 5000 BC Mazama awoke from its slumber with explosive rhyodacite eruptions on the northern part of the main summit where Llao Rock now resides.
	www.websbiggest.com /dir-wiki.cfm?cat=mount_mazama&tab=discuss (1903 words)

	National Park Service: National Parks Portfolio (Crater Lake)
		Where Mount Mazama reared his noble head, there is nothing—until you climb the slopes once his foothills, and gaze spellbound over the broken lava cliffs into the lake which lies magically where once he stood.
		The story of the undoing of Mount Mazama, of the birth of this wonder lake, is one of the great stories of the earth.
		When Mount Mazama collapsed into this vast hole, leaving clean cut the edges which to-day are Crater Lake's surrounding cliffs, there was instantly a surging back.
	www.cr.nps.gov /history/online_books/portfolio/portfolio5d.htm (301 words)

	Géographie physique et quaternaire : HOLOCENE CHIRONOMID-INFERRED SALINITY AND PALEOVEGETATION RECONSTRUCTION ... (Site not responding. Last check: 2007-11-03)
		Volcanic activity is still evident in western North America today, and the eruption of Mount St. Helens in 1980 has prompted several studies of volcanic influences on the biology and chemistry of aquatic and terrestrial environments (Antos and Zobel, 1986; Baross et al., 1982; Mack, 1981; Wissmar et al., 1982a,b).
		The Mount Mazama ash is the thickest and most widespread of all of the tephras to be deposited in southern British Columbia, and is often the only tephra visible in cores from this region (Clague, 1991).
		However, the early freshwater period and Mount Mazama ash related intervals were clearly revealed in Kilpoola core 2 as well as core 1.
	www.erudit.org /revue/gpq/1999/v53/n2/004878ar.html (7430 words)

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