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Topic: Volcanic field

	Auckland volcanoes
		Volcanic activity from an eruption at a site within the Auckland volcanic field could produce serious problems in the day to day existence for those who live in the Auckland region and for New Zealanders supported by Auckland’s business and industry.
		Knowledge of the type and effects of volcanic activity are based on studies of volcanic deposits in the Auckland area and on analogues of similar eruptions from similar types of volcanoes elsewhere in the world.
		Although volcanic earthquakes rarely exceed an intensity of 8 on the Modified Mercalli Scale (this scale is based on the felt intensity of an earthquake and is different from the Richter scale based on the amount of energy released), they would be destructive if an eruption occurred in or near a built up area.
	www.gns.cri.nz /what/earthact/volcanoes/nzvolcanoes/aucklandprint.htm (6164 words)

	Volcanism Studies Related to the Probabilistic Volcanic Hazard at Yucca Mountain for the Period 1986-1996
		Basalts of this field are subalkalic and alkalic and erupted between 5.89 and 4.7 Ma.
		Field, petrographic, major element, trace element, and isotopic data were used to document the origin of phase 2 intermediate rocks by mixing (combined with fractional crystallization) of mafic and felsic magmas similar to bimodal phase 3 rocks.
		The volcanic section to the west of Mt. Perkins consists of a basal section of basalt overlain by a thick section of andesite and subordinate dacite, in turn overlain by a thick section of dacite and rhyolite flows and domes.
	www.state.nv.us /nucwaste/yucca/volcan01.htm (8178 words)

	[No title]
		Volcanic fields also form on the flanks of composite or large shield volcanoes and within calderas, where they are often distributed along rift zones.
		Age determinations for individual volcanic vents are used to estimate temporal recurrence rates of volcanism, sometimes referred to as the intensity of volcanic activity, and to correlate rates of volcanic activity with other factors, such as plate motion, rates of crustal extension, and changes in petrology.
		Alignments of basaltic vents are common in volcanic fields, on shield volcanoes, and in calderas.
	www.cas.usf.edu /~cconnor/hazards/art4/art4.html (4263 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		Volcanic fields are usually 60 or more miles across, and contain tens to several hundred separate volcanoes.
		The distinctive characteristic of the Raton-Clayton field is its great size, young age, continental interior setting, and possible association with one of the few volcanic hot spots in the world.
		The earliest lavas of the Raton-Clayton field flowed onto the surface of sediment shed eastward from the Sangre de Cristo Mountains.
	www.nmmnh-abq.mus.nm.us /nmmnh/volcanoes/Raton.html (535 words)

	Alex Sánchez, M.S. thesis defense
		The volcanic field is situated in the eastern part of the St. George basin in southwestern Utah, approximately 25 km east-northeast of St. George, Utah near the small town of Hurricane.
		The volcanic field is bounded on the west and north by the Virgin River and it straddles the north-striking Hurricane fault.
		This indicates that the Hurricane volcanic field is polygenetic.
	www.unlv.edu /Research_Centers/Volcanic_and_Tectonic_Studies/alex.html (796 words)

	Navajo Volcanic Field, Arizona (Site not responding. Last check: 2007-10-20)
		The volcanic plugs or necks of the Navajo volcanic field form crudely cylindrical masses.
		This is the remains of the shallow interior of the volcano.
		The rocks on this volcanic field are minette and kimberlite based on their composition.
	volcano.und.nodak.edu /vwdocs/volc_images/north_america/arizona/navajo.html (463 words)

	GO 326 Eifel volcanism
		The Eifel volcanic zone is separated into two portions--east and west, which developed during the Quaternary uplift of the Rhenish Shield.
		The volcanic deposits are dominated by potassium-rich, silica-poor scoria cones, which are typical for intraplate, continental settings (van den Bogaard 1995).
		The Eifel volcanic region is closely associated with the Rhine Graben, a continental rift zone of Cenozoic age--see handout maps.
	academic.emporia.edu /aberjame/tectonic/eifel/eifel.htm (882 words)

	Global Volcanism Program \| Auckland Field \| Summary
		The 140 sq km Auckland volcanic field, which is a late Pleistocene to late Holocene in age, lies at the southern end of the Northland Peninsula and is overlain by New Zealand's largest city.
		The Auckland volcanic field has dominantly produced intraplate alkali basaltic to basantic rocks forming the northernmost of a group of Quaternary volcanic fields of the Auckland Intraplate Province.
		The Rangitoto eruption, about 600 years ago, was the largest of the Auckland volcanic field and created the 6-km-wide Rangitoto Island, which consists of multiple scoria cones up to 260-m high that cap a low shield volcano with a broad apron of lava flows.
	www.volcano.si.edu /world/volcano.cfm?vnum=0401-02= (211 words)

	RECURRENCE RATES OF VOLCANISM IN BASALTIC VOLCANIC FIELDS: AN EXAMPLE FROM THE SPRINGERVILLE VOLCANIC FIELD, AZ, USA
		Models of volcanism recurrence rate are used to evaluate long-term volcanic hazards and to suggest mechanisms for the formation of volcanic fields (Bacon, 1982; Kuntz and others, 1986; Ho, 1992; McBirney, 1992; Wadge and others, 1994; Connor and Hill, 1995).
		The model is used to track the Plio-Quaternary development of this large Colorado Plateau volcanic field (Figure 1) and to quantify the relationship between rate of vent formation, volume measured as magma output rate, and changes in the major petrologic characteristics of basalts.
		This pattern is clear in the eastern portion of the field at 1.0 Ma (Figure 12c) and the western and central portions of the field at 0.75 Ma (Figure 12d).
	www.cas.usf.edu /~cconnor/hazards/art3/art3.html (10979 words)

	Resurgent Calderas and the Valles Caldera (Site not responding. Last check: 2007-10-20)
		The volcanic activity is related to the tectonic movements along this intersection.
		The lowlands (blue) are within the Rio Grande rift; the Jemez volcanic field (with the circular depression in the middle) sits astride the western rift boundary.
		The green patch immediately east of the Jemez volcanic field is the Cerros del Rio, a mid-rift basaltic volcanic field.
	www.solarviews.com /span/valles.htm (1331 words)

	Cenozoic/Mesozoic Volcanism (Site not responding. Last check: 2007-10-20)
		The Coso volcanic field lies to the east of the Sierra Nevada Range at the western edge of the Basin and Range.
		The youngest eruptions are bimodal, with basaltic lava flows intruded by 38 rhyolite lava flows and domes.
		The most recent volcanic activity at Red Hill (see photo above) is dated at about 10,000 years although there is evidence for a much more recent flank eruption from the small vent of the northwest flank of the cinder cone.
	www.csupomona.edu /~geology/docs/sierra.html (1495 words)

	40Ar/39Ar and K-Ar Geochronology and Tectonic Significance of the Late Cretaceous Adel Mountain Volcanics and Spatially ...
		volcanic rocks have been intensely deformed by folds and thrust faults along their southwestern margin, but are essentially undeformed to the east.
		Complexities in field relationships with respect to folds and faults shown by the early Tertiary intrusions as well as complications in the argon systematics indicate that these interpretations must be considered preliminary.
		The dike forms a pronounced topographic ridge and may be a feeder for one of the small laccoliths present east and northeast of the field.
	mason.gmu.edu /~sharlan/adelmountainvolcanics.htm (678 words)

	The volcanic field (Site not responding. Last check: 2007-10-20)
		The Auckland volcanic field is comprised of monogenetic volcanoes.
		The Auckland Volcanic Field is comprised of monogenetic volcanoes which means it is unlikely that One Tree Hill or any of the existing volcanoes will erupt again.
		While the entire Mt Wellington volcanic complex is of geological interest, much of the lava flow has been modified by urban and industrial development, and consequently the primary heritage value is the remaining scoria cone that is reserved.
	www.arc.govt.nz /arc/environment/hazards/volcanoes-of-auckland/volcanic-field.cfm (2388 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		Ship Rock is a spectacular volcanic neck located within the Colorado Plateaus province in the northwestern ("Four Corners") region of New Mexico and in the middle of Navajo country.
		It is part of what is known as the Chuska volcanic field, a diffuse group of small intrusions, dikes, and some extrusive rocks scattered between Gallup, New Mexico and Farmington, New Mexico.
		As is common with breccias within many volcanic necks, the mixture of comminuted sandy host material and juvenile material is some extreme in the breccias that it is often difficult to distinguish sedimentary and volcanic materials on a hand specimen basis.
	www.nmmnh-abq.mus.nm.us /nmmnh/volcano/shiprock.html (794 words)

	Coso Volcanic Field - Wikipedia, the free encyclopedia
		The Coso Volcanic Field is located at the west edge of the Basin and Range province.
		The Coso Volcanic Field is one of the most seismically active regions in the United States, producing dozens of tremors in the M1 and M2 range each week.
		The Coso Volcanic Field shows stunning examples of volcanic activity, probably last active 30-40,000 years ago, but ash emission and small cone building episodes may be Holocene (>10,000 years) in age.
	en.wikipedia.org /wiki/Coso_Volcanic_Field (663 words)

	Volcanic Eruptions: Field Observations, Experimental Constraints, and Integrated Modeling Posters - Volcanology, ...
		Volcanic materials often show reddish colors and this red coloring is considered to be due to the high temperature oxidation process.
		In these three years, the main activity is the steam emission and the geodetic observation records slow shrinkage of volcanic body and the seismicity is not so high as that in the dike intrusion stage in 2000.
		However, strength of materials of fields or volcanoes may become one of the new key parameter of scaling law of volcanic explosions.
	www.agu.org /meetings/wp04/wp04-sessions/wp04_V23A.html (4428 words)

	References for Sea of Cortez Field Trip
		Cenozoic volcanism and tectonics in NW Mexico: a transect across the Sierra Madre Occidental volcanic field and observations on extension related magmatism in the southern basin and range and Gulf of California tectonic provinces.
		Lynch, D.J. and Gutmann, J.T. Volcanic structures and alkaline rocks in the Pinacate volcanic field of Sonora, Mexico: in Davis, G.H., and VandenDolder, E.M., eds., Geologic Diversity of Arizona and its Margins, Arizona Bureau of Geology and Mineral Technology Special Paper 5, p.
		Basaltic volcanism near the intersection of the Sierra Madre volcanic province and the Mexican Volcanic Belt.
	www.geo.mtu.edu /volcanoes/research/djsofiel/cortez/reference.html (729 words)

	Field Studies in Volcanology (Site not responding. Last check: 2007-10-20)
		Field exercises, complemented by evening lectures, cover various techniques used in field investigations of volcanic rocks, including applications to studies in volcanology, petrology, economic geology, and geothermal systems.
		Field exercises are conducted in the Miocene-Quaternary Jemez Mountains volcanic field (including Valles Caldera) in north-central New Mexico.
		Field course participants are based at the University of New Mexico's Young Ranch Field Station.
	epswww.unm.edu /volcano/vfield/home.htm (233 words)

	Global Volcanism Program \| Ibusuki Volcanic Field \| Summary
		Ibusuki volcanic field at the southern tip of Kyushu consists of numerous central cones and maars, the 4.5-km-wide Ikeda-ko caldera, and Kaimon-dake stratovolcano.
		The symmetrical, 922-m-high andesitic Kaimon-dake is the most prominent feature of the volcanic field and is capped by a lava dome.
		Ibusuki Volcanic Field has been very active during the Holocene, forming the Ikeda-ko caldera about 4600 years ago, numerous maars and lava domes, and, during the last 4000 years, Kaimon-dake.
	www.volcano.si.edu /world/volcano.cfm?vnum=0802-07= (166 words)

	Auckland Volcanic Field - Wikipedia, the free encyclopedia
		The Auckland volcanic field is a monogenetic volcanic field on the North Island of New Zealand.
		The field began its volcanic life cycle between 60000 and 140000 years ago, when the first vents erupted at the Domain, Albert Park and Saint Heliers.
		Several of the volcanic cones were occupied by substantial Māori pa before European settlement, and many terraces and other archeological remnants are still visible today.
	en.wikipedia.org /wiki/Auckland_Volcanic_Field (418 words)

	GEOWARN - Reactivation of Volcanic Activity in the Kos-Yiali-Nisyros-Tilos Volcanic Field
		Reactivation of magmatic and volcanic activity in quiescent volcanic areas is signaled by an increase in geodynamic activity.
		This is expressed as earthquake activity followed by changes in chemical and isotopic compositions, and increased temperatures in hot springs and of gases and waters in fumarolic fields.
		In most cases, large tectonic earthquakes are potential eruption precursors and predate the onset of volcanic unrest in time scales of weeks and months.
	www.geowarn.ethz.ch /index.asp?ID=46 (185 words)

	New Page
		The Auckland volcanic field has about 50 volcanoes, within an area of 360 square kilometres.
		The field is expected to have a total life of approximately a million years, so geologically speaking, it is still very young.
		Smith, I.E.M. and Allen, S.R. (1993) Volcanic Hazards at the Auckland Volcanic Field.
	www.gns.cri.nz /what/earthact/volcanoes/arc/index.html (603 words)

	GRANTS RIDGE
		Baker, I., and Ridley, W.I. Field evidence and K, Rb, Sr data bearing on the origin of the Mt. Taylor volcanic field, New Mexico, U.S.A. Earth and Planetary Science Letters 10, 106-114.
		Lipman, P.W., and Moench, R.H. Basalts of the Mount Taylor Volcanic Field, New Mexico.
		Shackley, M.S. Geochemical differentiation and prehistoric procurement of obsidian in the Mount Taylor Volcanic Field, northwest New Mexico.
	www.swxrflab.net /grants.htm (608 words)

	Module6 (Site not responding. Last check: 2007-10-20)
		The Challis volcanic episode was active during the Eocene, between ~52-39 Ma, with the bulk of the eruption dating from 51-45 Ma.
		The Challis volcanic episode is part of a wide-spread Eocene volcanic belt, which covered a large part of the Eocene northwestern United States and southwestern British Columbia.
		Mineralization within the Challis Volcanic Group is associated volcanic and plutonic activity, such as the emplacement of the domes and plutons, caldera collapse, and widespread hydrothermal activity.
	geology.isu.edu /nsf-isugeol/Modules/Module6/Module6.htm (1440 words)

	The San Francisco Volcanic Field, Arizona \| USGS Fact Sheet 017-01 (Site not responding. Last check: 2007-10-20)
		Northern Arizona’s San Francisco Volcanic Field, much of which lies within Coconino and Kaibab National Forests, is an area of young volcanoes along the southern margin of the Colorado Plateau.
		Flagstaff lies at the south-central edge of the volcanic field nestled between the base of Elden Mountain and the Observatory Mesa flow emitted from A-1 Mountain.
		SP Crater, in the San Francisco Volcanic Field, is an excellent example of a cinder cone and associated lava flow.
	geopubs.wr.usgs.gov /fact-sheet/fs017-01 (1434 words)

	SummitPost - San Francisco Volcanic Field -- Climbing, Hiking & Mountaineering (Site not responding. Last check: 2007-10-20)
		Meriam Crater is one of the largest craters in the San Francisco Volcanic Field.
		The San Francisco Volcanic Field started its procession of Volcano's around the area that the town of Williams.
		The hike to the summit is steep and takes a bit of route finding, navigating through the forest and having no views of the summit or where it is. The best route is up Peak 9,004 then across the ridgeline up and down a few minor ridge points then up to the summit.
	www.summitpost.org /area/range/236087/san-francisco-volcanic-field.html (1521 words)

	March-April GSA Bulletin media highlights
		Large-volume silicic ignimbrites exposed within and on the margins of the eastern Snake River Plain erupted between 7.5-3.5 Ma from the Heise volcanic field from 4 nested calderas.
		This volcanic field is in the eastern Snake River Plain along the track of the Yellowstone hot spot and represents the eruptive center immediately preceding the present-day Yellowstone Plateau volcanic field.
		Field and microstructural observations suggest that micro-fracturing and melt-assisted granular flow may be the best candidates for faster-than-normal strain rates.
	www.eurekalert.org /pub_releases/2005-03/gsoa-mgb031405.php (3828 words)

	Potrillo Volcanic Field Seismic Experiment
		On May 16-18, 2003, the geophysics group at the University of Texas at El Paso conducted a wide-angle seismic refraction/reflection experiment across a portion of the southern Rio Grande Rift centered on the Potrillo Volcanic Field (PVF).
		A spacing of 100 m was used for a 40 km stretch centered on the Potrillo Volcanic Field in order to obtain detailed information on the crustal structure of that region.
		A portion of a shot gather centered on the Potrillo Volcanic Field shows excellent near-vertical incidence reflections from the Moho at 11 to 12 s.
	www.geo.utep.edu /pub/miller/pvfweb (601 words)

	Capulin Volcano National Monument - geology (U.S. National Park Service)
		The symmetry of Capulin Volcano was preserved because lava did not flow from the main crater but from secondary vents located at the western base of the cone.
		The largest of these volcanic peaks is the Sierra Grande, an extinct volcano rising some 2,200 feet above the surrounding plain, about 10 miles to the southeast.
		Capulin Volcano is just one of about one hundred volcanic features in the Raton-Clayton Volcanic Field which covers about 8000 square miles in northeastern New Mexico and southeastern Colorado.
	www.nps.gov /cavo/geology.htm (255 words)

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