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	Lassen Peak - Wikipedia, the free encyclopedia
		Lassen Peak, in Shasta County, California USA, is the largest single lava dome volcano also known as a plug dome in the world and is the southernmost volcano in the Cascade Range.
		A plug dome volcano is a volcano that is composed of alternate layers of lava and volcanic ash.
		Lassen is located in north-central California in the Shasta Cascade region and is the centerpiece of Lassen Volcanic National Park.
	en.wikipedia.org /wiki/Lassen_Peak (791 words)

	Lassen Volcanic National Park - Wikipedia, the free encyclopedia
		Lassen Volcanic National Park is one of the few areas in the world where all four types of volcano can be found (plug dome, shield, cinder cone, and strato).
		Lassen Peak and Cinder Cone were declared United States National Monuments in 1907 by President Theodore Roosevelt.
		Lassen Peak is made of dacite and is the world's largest lava dome.
	en.wikipedia.org /wiki/Lassen_Volcanic_National_Park (1020 words)

	Lassen Peak
		Helens stole the show in 1980, Lassen Peak was the volcano best known for a large eruption in the twentieth century on this continent.
		Lassen Peak is the southernmost of the Cascade volcanoes, and its lower latitude prevents the formation of permanent glaciers.
		The well-marked, 2.2-mile Lassen Peak Trail leads to the summit during the summer and early fall, providing one of the two easiest, shortest, and safest routes on any Cascade volcano (Mt. Bachelor is the other).
	www.geocities.com /Yosemite/Campground/1435/lassen.htm (631 words)

	Lassen Volcanic National Park
		Lassen Volcanic National Park, located in north central California at the southern end of the Cascade mountain range, is the only national park containing a volcano which has erupted in the twentieth century.
		Lassen Peak is a stratovolcano--a volcano which is composed of alternate layers of lava and volcanic ash.
		Although Lassen Peak and the other volcanoes in the park area are no longer active, there are many signs that the area is still very much geologically alive.
	www.shannontech.com /ParkVision/Lassen/Lassen.html (971 words)

	Photo 5 (Site not responding. Last check: 2007-10-07)
		Lassen Peak (10, 456 feet), from the east, Lassen Volcanic Park, California.
		Lassen Peak, the southern-most volcano of the Cascade Range, is a volcanic dome formed of dacite.
		The sparsely-forested area in the foreground, called the Devastated Area, was destroyed by a lateral blast and ensuing large mudflow stemming during the 1915 eruptions.
	volcano.und.nodak.edu /vwdocs/Hopson/hopson5.html (64 words)

	Lassen Peak. The Columbia Gazetteer of North America. 2000
		Lassen Peak or Mount Lassen (10,457 ft/3,187 m), SE Shasta co., N Calif., at S end of Cascade Range, N of the Sierra Nevada, c.50 mi/80 km E of Redding.
		Helens erupted in 1980, Lassen was considered to be the only active volcano in the continental U.S. The last major eruption here occurred in 1914, and the volcano was intermittently active until 1921.
		The peak was a prominent landmark in the mid-1800s for westward travelers to Calif. Lassen Peak Ski Area to S. The Columbia Gazetteer of North America.
	www.bartleby.com /69/62/L02262.html (145 words)

	Lassen Peak - Reflections by Craig Palmer
		Mount Lassen was once a vent on the flank of the ancient Mount Tehama, believed to have been 11,000 feet in elevation with a base 11 miles wide.
		Lassen is the southernmost volcano in the Cascades Range and Pacific Ring of Fire.
		Lassen is a plug dome volcano which means it was formed by an extremely rigid and viscous lava flow that solidified as it cooled, causing a "plug" in the volcanic vent.
	www.craigpalmerdesign.com /lassen/lassen.html (154 words)

	CVO Website - Lassen Peak Volcano, California
		Lassen's long and complex eruptive history is a 600,000-year-long record of volcanism associated with the generation, rise, emplacement, and evolution of a plutonic magma body in the crust.
		Cinder Cone is a 700-foot-high cone of loose scoria.
		Lassen Peak is the largest of a group of more than 30 volcanic domes erupted over the past 300,000 years in Lassen Volcanic National Park in northern California.
	vulcan.wr.usgs.gov /Volcanoes/Lassen/description_lassen.html (5403 words)

	19 May 1915 Eruption of Lassen Peak
		The Lassen Peak eruptions of 19 and 22 May 1915 were the most violent in a series of eruptions that began a year earlier and continued until late 1917.
		Most observations of activity at the summit of Lassen Peak during the 1914-1917 eruptions were made from Mineral, California, about 20 km south of the summit, and from Manton, California, about 25 km to the west (see Fig.
		Finch RH (1930) Mudflow eruption of Lassen mudflows.
	www.msss.com /earth/lassen/lassen2.html (5889 words)

	SummitPost - Lassen Peak -- Climbing, Hiking & Mountaineering (Site not responding. Last check: 2007-10-07)
		Lassen Peak, located east of Redding and Red Bluff on I-5, is the largest plug-domed volcano in the world.
		Summer to autumn hiking on this peak is straight-forward following the 2.5 mile (class 1) Lassen Peak Trail which asends the Southeast Ridge to the summit from the 8,500' Lassen Peak trailhead.
		Year round trailheads to this peak are on the Lassen Loop Road whether you are driving to the Lassen Peak trailhead on the South Side or cross-country skiing from the Manzanita Lake or Mineral entrances to Lassen Volcanic National Park.
	www.summitpost.org /mountain/rock/150414/lassen-peak.html (834 words)

	Lassen Volcanic National Park (Site not responding. Last check: 2007-10-07)
		Lassen Volcanic National Park was established on August 9, 1916, following a series of eruptions of Lassen Peak which began in 1914.
		Lassen Peak is the southern most peak in the Cascade Mountain Range which is part of the Pacific Ring of Fire.
		Lassen Peak, Chaos Crags, Chaos Jumbles, Cinder Cone, Fantastic Lava Beds and Painted Dunes are only a small sample of what volcanic activity can be found in the park.
	www.scsc.k12.ar.us /2001Outwest/PacificNaturalHistory/Projects/CearleyD/Lassen.htm (1428 words)

	Lassen Volcanic National Park : Introduction \| Frommers.com
		Lassen Peak is the southernmost peak in a chain of volcanoes (including Mount Saint Helens) that stretches all the way from British Columbia.
		The peak has been dormant for nearly three-quarters of a century now, but the area still boils with a ferocious intensity: Hot springs, fumaroles, geysers, and mud pots are all indicators that Lassen hasn't had its last word.
		Lassen is one of the least-visited national parks in the lower 48 states, so crowd control isn't as big a consideration here as in other places.
	frommers.com /destinations/lassenvolcanicnationalpark/1085010001.html (557 words)

	California Guide - Lassen Volcanic National Park - Lassen Peak
		Until the explosion of Mount St. Helens in 1980, Lassen Peak was the only volcano with recent activity in the US since 1851, apart from some in Hawaii and Alaska.
		Several days later the peak exploded and a huge cloud of debris was projected 7 miles upwards; this was accompanied by more lava and gaseous blasts that devastated a large area northeast of the mountain.
		Lassen Peak is the most southerly member of the Cascade range, a series of largely dormant volcanoes extending as far north as British Columbia in Canada.
	www.americansouthwest.net /california/lassen_volcanic/lassen_peak.html (476 words)

	Lassen Peak: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-10-07)
		The shasta cascade region of california is located in the northeastern section of the state bordering oregon and nevada, north of the central valley...
		Lassen Peak was named in honor of Danish flsmith Peter Lassen who guided immigrants past the peak to Sacramento Valley California Central Valley quick summary:
		Starting in 1914 and ending in 1921 Lassen came alive with a series of phreatic eruption[Follow this hyperlink for a summary of this subject]s (steam explosions), EHandler: no quick summary.
	www.absoluteastronomy.com /encyclopedia/l/la/lassen_peak.htm (1661 words)

	Skiing the Cascade Volcanoes: Lassen Peak (Site not responding. Last check: 2007-10-07)
		Lassen Peak is the southernmost active volcano in the Cascade Range, located in northern California halfway between Lake Tahoe and the Oregon border.
		Lassen is one of the largest plug domes in the world, a massive block of dacite lava extruded up from the shattered remains of the collapsed Mount Tehama stratovolcano.
		Lassen Volcanic National Park receives some of the heaviest snowfalls in California during the winter and spring, with the snowpack often building 20-25 feet (6-8 m) deep near Lake Helen, just south of Lassen Peak.
	www.skimountaineer.com /CascadeSki/CascadeSki.php?name=Lassen (1055 words)

	deseretnews.com \| Lassen Peak erupted in '15
		Answer: Until Mount St. Helens awoke in 1980, Lassen Peak in California was the most recent volcano to have a significant eruption in the contiguous 48 states.
		Lassen Peak, also known as Mount Lassen, is the southernmost volcano in the Cascade Range, the same string of mountains that includes St. Helens.
		Lassen is about 100 miles south of the Oregon-California line in the Lassen Volcanic National Park, the site of volcanic activity for millions of years.
	deseretnews.com /dn/view/0,1249,595099154,00.html (226 words)

	Mt. Lassen
		Lassen Peak is an example of what is called a "volcanic dome".
		Volcanism is thought to have begun at the center between about 600,000 and 350,000 years ago (the late Pleistocene and Holocene periods), and the eruption history continues with a lot of activity in the last 35,000 years.
		Disruption of the sticky lava on the upper east side of Lassen Peak on May 19 resulted in an avalanche of hot rock onto a snowfield.
	www.windows.ucar.edu /cgi-bin/tour.cgi?link=/earth/interior/Mt_Lassen.html&sn=272361&art=ok&cdp=/windows3.html&cd=false&frp=/windows3.html&fr=f&tour=&sw=false&edu=high (240 words)

	NPCA Destination Finder
		Lassen Volcanic became a national park in 1916 because of its significance as an active volcanic landscape.
		Lassen Peak began erupting in 1914, had the most significant activity in 1915, and had minor activity until 1921.
		The peak is the southernmost volcano in the Cascade Range, which extends from here into Canada.
	syndication.getoutdoors.com /finder?id=npca&national_park=36 (247 words)

	Volcano Hazards of the Lassen Volcanic National Park Area, California \| USGS Volcano Hazards Fact Sheet
		When Lassen Peak erupted again on May 22nd, the area was further devastated by a high-speed flow of hot volcanic ash and gas (called a “pyroclastic flow”), and the incorporation of snow into this flow generated new mudflows.
		Lassen Peak and nearby volcanic domes are the most recently active parts of the Lassen “volcanic center,” which began to erupt about 600,000 years ago.
		The Lassen dome field, in contrast, is an example of a volcanic area that erupts lava from numerous individual vents, each of which is active for a few years to a few decades and usually does not erupt again.
	pubs.usgs.gov /fs/2000/fs022-00 (2877 words)

	EO Newsroom: New Images - Lassen Volcanic National Park
		These peaks are the remnants of Mt. Tehama, the massive ancient volcano from which Lassen Peak was born.
		Lassen Peak is the southernmost in the chain of 13 large volcanic peaks that run from Washington to California.
		Lassen Volcanic National Park and nearby Shasta Peak are considered the most likely volcanoes in the Cascade Range to shift from dormancy to active eruptions.
	earthobservatory.nasa.gov /Newsroom/NewImages/images.php3?img_id=17170&topic=life (522 words)

	Climbing Mt Lassen, climb Lassen Peak
		Note: Lassen Peak is commonly referred to as Mt. Lassen among climbers.
		During the winter, Lassen Park is well-known for having snow depths in excess of 50 feet and that was evident from the large snow patches that still covered the trail in late July.
		Lassen Park is only open for a few months during the summer because of the heavy winter snowfall but once it’s opened, people head for the many nature trails and the vibrant souls face the challenge of reaching the summit.
	www.shastahome.com /lassen-volcanic/climbing_mt_lassen.htm (802 words)

	1915 Eruption
		Lassen Peak is the southernmost active volcano in the Cascade Range, and prior to the eruption of Mount St. Helens in 1980, the 1914-1917 eruption of Lassen Peak was the most recent in the Cascades.
		Lassen Peak is the largest of a group of more than 30 lava domes in the Lassen domefield.
		The depression on the northeastern flank of Lassen Peak is a glacial cirque, where ice accumulated to form a glacier 10 kilometers long.
	www2.nature.nps.gov /geology/usgsnps/lassen/lassenfact.html (1316 words)

	[No title] (Site not responding. Last check: 2007-10-07)
		The last Cascade volcano to erupt in California was Lassen Peak, which erupted from 1914 to 1921.
		The two most recent were Lassen Peak in 1914 to 1921 and a major...
		With the exception of the 1915 eruption of remote Lassen Peak in Northern California, the range was quiet for more than a century.
	www.worldhistory.com /wiki/L/Lassen-Peak.htm (430 words)

	Hilltopping on the Lassen Peak Trail 7-09-05 (Site not responding. Last check: 2007-10-07)
		I was operating from the Lassen Peak Trail (approx.
		Lassen Peak is located in Lassen Volcanic National Park.
		Lassen Park is located in the northern part of the state.
	home.covad.net /kg6biq/lassen.html (427 words)

	Lassen Peak
		Lassen Peak is either the southernmost peak in the Cascade Range or a northern sentinel of the Sierra Nevada--take your pick.
		Lassen Peak was more famous prior to 1980, when the eruption of Mount Saint Helens in Washington robbed it of the distinction of the most recently active volcano in the contiguous United States.
		The area surrounding the peak is a National Park, and a very steep hiking trail climbs 2500 verical feet up the ash and pumice slopes to the summit crater area.
	www.peakbagger.com /peak.aspx?pid=2513 (238 words)

	The Texas Mountaineer (Site not responding. Last check: 2007-10-07)
		Lassen Peak, CA Lassen Peak, officially at 3,189 m (10,462 ft), is the southernmost volcano in the Cascade Range.
		Cinder Cone National Monument and Lassen Peak National Monument were established by proclamation of Theodore Roosevelt on May 6, 1907 to be administered by the U.S. Forest Service.
		This peak is one of the easier Cascade volcanoes to climb, due to the trail constructed from a saddle at ~2600 m (8500 ft) that switchbacks all the way up to the weather station at the summit.
	www.txmountaineer.com /reports/Lassen-0308.htm (2065 words)

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