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Topic: Lava dome

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	Lava - Wikipedia, the free encyclopedia
		Felsic lavas such as rhyolite and dacite are often associated with strombolian eruptions, typically form lava domes and sheeted flows, and are associated with pyroclastic surge deposits and tuffs.
		Lava domes are formed by the extrusion of viscous felsic magma.
		Lava tubes are known from the modern day eruptions of Kīlauea, and significant, extensive lava tubes of Tertiary age are known from North Queensland, Australia, some extending for 15 kilometres.
	en.wikipedia.org /wiki/Lava (2603 words)

	Lava dome - Wikipedia, the free encyclopedia
		In volcanology, a lava dome is mound-shaped growth resulting from the eruption of high-silica lava (usually rhyolite and/or dacite) from a volcano.
		Lava domes are one of the principal structural features of many stratovolcanoes worldwide.
		Lassen Peak in the northern part of the U.S. state of California is the largest single lava dome in the world and has the distinction of being the only other Cascade volcano besides Mount St. Helens to have erupted (1914-1921) in the 20th Century.
	en.wikipedia.org /wiki/Lava_dome (300 words)

	Daag -- Growth of a Postclimactic Lava Dome
		An andesitic lava dome grew on the floor of the new caldera of Mount Pinatubo between July and October of 1992.
		An andesitic lava dome was extruded onto the north flank of Mount Pinatubo between June 7 and June 12, 1991, preceding the large explosive eruptions of andesite and then dacite on June 12-15.
		The 1992 dome andesite and the mafic inclusion samples are similar in composition, mineral assemblage, and texture to andesite and mafic inclusions from the lava dome that grew in the head of the Maraunot River valley during the week preceding the climactic June 15, 1991, eruption (Pallister and others, this volume).
	pubs.usgs.gov /pinatubo/daag2 (6879 words)

	USGS Photo Glossary: Lava dome
		The longest historical dome-building eruption is still occurring at Santiaguito Dome, which is erupting on the southeast flank of Santa Maria volcano in Guatemala; the dome began erupting in 1922.
		The volcanic dome in the Cascades is Lassen Peak in northern California.
		Before the 1980-1986 eruption of Mount St.Helens, its symmetrical summit cone was capped by a lava dome erupted between the 1500's and late 1700's.
	volcanoes.usgs.gov /Products/Pglossary/LavaDome.html (393 words)

	HawaiiNews.com: Exploring lava dome eruptions
		Volcanic domes are formed when sticky, high-silica lava piles up around a vent instead of flowing rapidly away, as in the case of low-silica basaltic lava erupted in Hawai`i.
		Erupting domes are commonly associated with fast-moving pyroclastic flows, which form when either blocks of fresh lava break off from the dome and move rapidly downhill or when a lava dome is shattered during strong explosive activity.
		Lava continues to flow through the PKK lava tube from its source on the flank of Pu`u `O`o to the ocean, with scattered surface flows breaking out of the tube.
	www.hawaiinews.com /archives/volcano_watch/000370.shtml (949 words)

	Dome collapses triggers pyroclastic flows at Unzen Volcano, Japan (Site not responding. Last check: 2007-10-30)
		Gray pathways spreading from the lava dome atop Unzen Volcano are the deposits of many small pyroclastic flows that originated from dome collapses.
		The lava dome was active between 1991 and 1995.
		Viscous lava began erupting in May 1991 at the summit of Unzen and quickly built a mound-shaped dome atop an older lava dome.
	volcanoes.usgs.gov /Hazards/What/PF/PFUnzen.html (441 words)

	CVO Website - Lava Domes
		The direct effects of dome eruption include burial or disruption of the preexisting ground surface by the dome itself and burial of adjacent areas by rock debris shed from the dome.
		Most domes are composed of silica-rich lavas that have a lower gas content than do the lavas erupted earlier in the same eruptive sequence; nevertheless, some dome lavas still contain enough gas to cause explosions within a dome as it is being formed.
		Domes at Mount Shasta, Mount St. Helens, Glacier Peak, Mount Hood, and near Lassen Peak have collapsed or exploded to produce hot pyroclastic flows, some extending as far as 20 kilometers from their sources.
	vulcan.wr.usgs.gov /Glossary/Domes/description_lava_dome.html (1553 words)

	CVO Website - Mount St. Helens - Lava Dome
		The dome at Mount St. Helens is termed a composite dome by scientists, because it represents the net result of many eruptive events, not just one event.
		By the end of October 1986, the volume of the dome and its talus apron was about 74.1x10^6 cubic meters, and the volume of all erupted material (including tephra and debris removed from the dome by explosions and rockfalls) was about 77.1x10^6 cubic meters.
		A dacite dome began to form in the crater of Mount St. Helens on October 18, 1980, 5 months after the catastrophic events of May 18.
	vulcan.wr.usgs.gov /Volcanoes/MSH/LavaDome/description_msh_dome.html (1290 words)

	ABC News: Volcano's Lava Dome Partially Collapses
		A massive blast of searing gas has collapsed a portion of Mount Merapi's unstable lava dome, easing pressure that threatened a full-blown eruption, but the volcano still could be deadly.
		The mountain has been venting steam and debris for weeks, but its lava dome swelled after a powerful May 28 earthquake, raising concerns the dome could suddenly collapse, sending scalding gas, rocks and debris hurtling into populated areas.
		But he warned that 250,000 beleaguered villagers near Merapi were not yet in the clear, as a crack in the lava dome's southern foot had widened, threatening to unleash more powerful surges of superheated gas.
	abcnews.go.com /Technology/wireStory?id=2068566&CMP=OTC-RSSFeeds0312 (413 words)

	[No title] (Site not responding. Last check: 2007-10-30)
		A small collapse of the SW edge of the lava dome in the crater of Caliente Dome produced a pyroclastic flow on 17 October at 0749.
		On 14 November at 2012, a tectonic earthquake caused a lava-flow collapse SW of the Caliente dome, triggering a pyroclastic flow that descended to the head of San Isidro ravine, an area of abundant accumulation of pyroclastic material and a known area for lahar initiation.
		Lava avalanches originated from the SW edge of the Caliente dome, and from the fronts of active lava flows on the volcano's SW flank.
	www.volcano.si.edu /reports/usgs/archive.cfm?volcano=santamar (6227 words)

	lava dome (Site not responding. Last check: 2007-10-30)
		Small pyroclastic flows are often associated with growth of lava domes due to collapse of hot blocks from over-steepened slopes on the dome.
		The summit lava dome complex at Augustine Volcano, Alaska.
		Steam rises from the base of the lava dome formed in 1986.
	www.geology.wisc.edu /~g111/Terms/lava_dome/lava_dome.htm (71 words)

	DLESE Find a Resource > "lava dome"
		Even before viscous lava first breached the old forest-covered lava dome of Soufriere Hills volcano, Montserrat, in November 1995, scientists monitoring the volcano were concerned about the potential effects of pyroclastic flows and surges that would likely accompany the emplacement of a new dome in the volcano's summit crater.
		It illustrates the growth of a volcano, using Paricutin and Mt. St. Helens as examples of an active volcano and a lava dome.
		Lahar is an Indonesian term that describes a hot or cold mixture of water and rock fragments flowing down the slopes of a volcano and (or) river valleys.
	www.dlese.org /dds/query.do?q=lava+dome&s=0 (749 words)

	EO Newsroom: New Images - Mount St. Helens
		In the five months between October 4, when Ikonos acquired the bottom image, and March 9, a new lava dome has grown in the crater, the large bowl in the center of these images.
		The fact that new dome was still intact on March 9 is evidence that it was not the source of the recent eruption.
		The U.S. Geological Survey estimates that the new lava dome, combined with deformed glacier ice and the part of the crater floor that the dome is lifting up have a volume of about 50 million cubic yards, which is almost one-half of the volume of the old dome prior to the major eruption in 1986.
	earthobservatory.nasa.gov /Newsroom/NewImages/images.php3?img_id=16849 (302 words)

	SwissEduc: Stromboli Online - Photoglossary
		Lava domes are rounded, steep-sided mounds built by very viscous magma, usually either dacite or rhyolite.
		Lava domes are often erupted, however, on the top and sides of stratovolcanoes.
		Although lava domes are built by nonexplosive eruptions of viscous lava, domes can generate deadly pyroclastic flows.
	www.swisseduc.ch /stromboli/glossary/dome-en.html (175 words)

	Lava Dome Five
		Lava Dome Five Enterprises, LLC is dedicated to providing dragons, dinosaurs, reptiles and furries of all sizes with centralized communications.
		Lava Dome Five is derived from a location in the 80's cartoon series, Dinosaucers.
		Lava Dome Five is a subset of a "fandom" that is commonly referred to as "furries." This general term covers anyone with an interest in anthropomorphic animals -- animals that are given human characteristics.
	www.lavadomefive.com /aboutus.html (3804 words)

	Excess argon within mineral concentrates from the new dacite lava dome at Mount St Helens volcano
		The lava dome formed by a complex series of lava extrusions, supplemented occasionally by internal inflation of the dome by shallow intrusions of dacite magma into its molten core.
		The stability of this third dome, along with decrease in the frequency of earthquakes and phreatic steam eruptions in the ten years after October 1986, indicate that the volcano, again, may be approaching a period of dormancy.
		The lithic inclusions in the lava dome might be thought to be the contaminant, in which case they might add ‘old’ mafic and non-mafic minerals to the young magma.
	www.creationontheweb.com /content/view/1521 (5043 words)

	Viscoplastic lava domes (Site not responding. Last check: 2007-10-30)
		The dynamics of expanding domes of isothermal lava are studied by treating the lava as a viscoplastic material with the Herschel-Bulkley constitutive law.
		Numerical and analytical solutions are derived that explore the effects of yield stress, shear thinning and basal sliding on the dome evolution.
		It is found that it is difficult to unravel the combined effects of shear thinning and yield stress; this may prove important to studies that attempt to infer yield stress from morphology of flowing lava.
	www.ma.ic.ac.uk /~rvcras/domes.html (133 words)

	ABC News: Lava Dome Surges at Mount St. Helens
		The dome is continuing to build, though geologists with the U.S. Geological Survey say its growth has slowed over the last several weeks.
		After all the rumblings and spurts of steam at the volcano last fall, geologists say they are not sure what the dome's rapid growth means — beyond one obvious fact.
		The explosion that occurred earlier this month destroyed a camera and a "spider," a device used to measure the growth of the dome, that had been put in place just 36 hours earlier.
	abcnews.go.com /Technology/story?id=444143&page=1 (387 words)

	What is a lava dome? (Site not responding. Last check: 2007-10-30)
		A lava dome is a very viscous blob of lava that barely can flow out of a vent.
		It is the equivalent of a lava flow, but so thick and pasty that it is barely moving.
		Sometimes gas pressure under the dome can grow so high that explosions occur and the dome is blasted away.
	volcano.und.edu /vwdocs/frequent_questions/grp9/question129.html (119 words)

	Welcome to Kenneth's Blog! Here are some links to sites where I've found much about lava dome (Site not responding. Last check: 2007-10-30)
		The University of Illinois are examing hardware lava dome ray tracing by using the ARB and other animals at the T. Cinco de Mayo clip art of lava dome fl june tailor magic.
		For lava dome translating various file formats, such as Aztec feature set here lava dome MilkShape croscill shower curtains animated cheshire cat 3D and many others are coming from the bottom of this Website, you are browsing the Animation Library, you lava dome can lava dome provide hardware support for our hosting them on webtv.
		This greyhound magazine is free to qualified readers, and is received lava dome three full business days for a better way to determine what type of world you want to see.
	lava-dome.xiallyti.be (990 words)

	Nonlinear dynamics of lava dome extrusion
		Nonlinear dynamics of lava dome extrusion, Nature, O. Melnik et al.
		During the eruption of the Soufriandegrave;re Hills volcano, Montserrat (1995-99), and several other dome eruptions, shallow seismicity, short-lived explosive eruptions and ground deformation patterns indicating large overpressures (of several megapascals) in the uppermost few hundred metres of the volcanic conduit have been observed.
		These phenomena can be explained by the nonlinear effects of crystallization and gas loss by permeable flow, which are here incorporated into a numerical model of conduit flow and lava dome extrusion.
	www.comdig.org /print_article.php?id_article=163 (159 words)

	Discover Vancouver Forum - Mt. St. Helen's Lava Dome Collapses
		Reportedlyl, a rock fall caused what is scientifically called a "substantial seismic signal," knocking a chunk off the lava dome, sending an ask plume above the crater rim.
		The lava dome rises from within the main crater and was created in the mountain's 1980 eruption.
		MOUNT ST. HELENS NATIONAL MONUMENT, WA (AHN) - The U.S. Geological Survery reports the falling of a large part of the growing lava dome on Mount St. Helens Saturday.
	www.discovervancouver.com /forum/topic.asp?TOPIC_ID=26369 (299 words)

	LAVA DOME: Definition of Lava Dome
		LAVA DOME: Definition of Lava Dome and other Volcano Terms and Words
		A lava dome is a mass of lava that has built a dome-shaped pile of lava.
		Lava domes are typically formed by many individual lava flows.
	www.supervolcano.org.uk /definition-of-lava-dome.asp (164 words)

	komo news \| Mt. St. Helens Lava Dome Grows 300 Feet Taller In 9 Days
		HELENS - The new lava lobe inside Mount St. Helens' crater has sprouted a piston-like protrusion the size of a 30-story building - glowing red at night.
		Like the old lava dome, formed in the six years after St. Helens' devastating May 18, 1980, eruption, the new lobe is made of a type of volcanic rock called dacite, Wynn said.
		More than 63 percent silica, it tends to be sticky and viscous, unlike the free-flowing lava of Hawaii.
	www.komotv.com /stories/33827.htm (805 words)

	Crater and Lava Dome (Site not responding. Last check: 2007-10-30)
		This view looks down into the crater, showing the massive lava dome in the middle which formed in a series of effusive eruptions from 1980 to 1987.
		Since 1987, the heat output has decreased enough to allow a new glacier to form within the crater, fed by tremendous quantities of snow blown and avalanched over the crater rim, and then protected from ablation by the vertical crater walls helping block the sun.
		This mass of snow and ice is flowing out around the lava dome in two massive lobes, and apparently it contains steam caves similar to those found in the craters of Mount Rainier and Mount Baker.
	www.skimountaineer.com /Trips/StHelensSki2000/CraterLavaDome.html (117 words)

	CNN.com - New Mount St. Helens lava dome grows - Nov 7, 2004
		The elongated lava dome spreads southward from the old dome, which was created in the six years after the volcano's cataclysmic eruption of May 18, 1980.
		Like the old dome, it is made of a volcanic rock called dacite, officials said.
		The new lava extrusion is about 900 feet long and 250 wide, scientists said last month.
	www.cnn.com /2004/US/11/06/mount.saint.helens/index.html (407 words)

	Santiaguito Lava Dome (Site not responding. Last check: 2007-10-30)
		This is Santiaguito lava dome as viewed from the summit of Santa Maria volcano.
		This viewpoint from the summit of Santa Maria looking down onto an actively exploding lava dome is pretty unique (and fascinating).
		You can see how the southern side of Santa Maria was partially collapsed and scoured away by the big 1902 eruption, and it continues to erode away today because this is an area of very heavy rainfall.
	volcano.und.nodak.edu /vwdocs/vwlessons/volcano_types/strato2a.htm (156 words)

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