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Topic: Volcanic activity

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SVE - Volcano News Due to the heightened volcanic activity, the exclusion zone was increased from a 6.5-km radius to a 7.5-km radius and restrictions to access remained within a radius of 11.5 km from the volcano's summit. The eruptive activity continues being low, as much by the number of eruptions like by the amount of ejected pyroclastic material, are few the eruptions that produce columns that reach the 500 m on crater C. The flanks northeast, this and Southeastern one continue being affected by the fall of pyroclastic material and acid rain. Explosive activity at the summit craters of Stromboli volcano resumed on early June 2003, before the end of the effusive eruption that finished between 21 and 22 July 2003. www.sveurop.org /gb/news/news.htm   (16984 words)

IDENTIFYING FORMER CENTERS OF VOLCANIC ACTIVITY ON LESVOS ISLAND, GREECE The volcanic activity in these locations was responsible for the extensive deposits of lavas, ash, ignimbrites, and tuffs in the central and western part of the island. The Miocene age volcanic activity appears in some cases to be fault aligned and is associated with regional crustal stretching and the resultant system of horsts and grabens. Specific centers of volcanic activity in the form of craters and domes are located near several villages: northwest of Vatousa, southwest of Thermi, near Agra, and at Mt. Lempetimnos. gsa.confex.com /gsa/2001AM/finalprogram/abstract_20086.htm   (321 words)

Global Climate Change Student Guide Episodes of relatively high volcanic activity (1250 to 1500 and 1550 to 1700) occur within the period known as the Little Ice Age, whilst the Medieval Warm Period (1100 to 1250) can be linked with a period of lower activity. In order to investigate this possibility, long, complete and well-dated records of past volcanic activity are needed. Whereas volcanic pollution of the lower atmosphere is removed within days by the effects of rainfall and gravity, stratospheric pollution may remain there for several years, gradually spreading to cover much of the globe. www.ace.mmu.ac.uk /Resources/gcc/2-6-3.html   (584 words)

VOLCANIC ACTIVITY, NORTHEAST TO SOUTHWEST ALONG ALEUTIAN ARC The phrase "suspected volcanic activity", used to characterize several responses, is an eruption report or report of unusual activity that is subsequently determined to be normal or enhanced fumarolic activity, weather-related phenomena, or a non-volcanic event. AVO response to reported remote volcanic activity varies depending on the source and content of the observation. In addition to responding to eruptive activity at Alaska volcanoes, AVO also disseminated information for the Kamchatkan Volcanic Eruption Response Team (KVERT) on the 1995 eruptions of 2 Russian volcanoes--Bezymianny and Karymsky (fig. geopubs.wr.usgs.gov /open-file/of96-738/alaska.html   (2963 words)

NASA GISS: Science Briefs: The Sun vs. the Volcano: Drivers of Regional Climate Change In the climate model, both the reduced output from the sun and the increased amount of volcanic aerosols (fine particles which reflect sunlight away from the Earth and which are injected into the stratosphere by volcanic eruptions) contribute a sizeable amount to the Northern Hemisphere cooling seen in temperature reconstructions. The second-largest volcanic eruption of the 20th century occurred at Mount Pinatubo in the Philippines on June 15, 1991. Volcanic and solar forcing of climate change during the preindustrial era. www.giss.nasa.gov /research/briefs/shindell_07   (878 words)

Venusian Volcanic Features In order to detect volcanic activity, scientists must compare images taken at different times and look for changes on the planet's surface. The majority of volcanic materials on Venus are thought to be basaltic in composition, partly because of their appearence. Volcanic constructs and edifices on Venus have been classified and subdivided on the basis of their size and morphology [Slyuta and Kreslavsky, 1990; Head et al., 1992]. www.solarviews.com /eng/venvolc.htm   (2781 words)

New Scientist Breaking News - New images reveal volcanic hotspot on Mars The layers may be volcanic ash mixed with water ice, says Gerhard Neukum, principal investigator of the HRSC at the Free University of Berlin, Germany. Neukum himself admits that his interpretation of these volcanic cones may be wrong "because we do not have any higher resolution imagery" than the 10 m resolution of the main camera on the HRSC. And some of that activity may still be going on today, the imaging team believes. www.newscientist.com /article.ns?id=dn7089   (767 words)

WHOI : Media Relations : Press Release : Volcanic Activity Discovered at Samoan "Hot Spot" The examinations suggested volcanic activity within the past 5 to 50 years, further evidence that Vailulu'u is the current location of the Samoan hot spot. The timing of Vailulu'u's volcanic activity is close to events that have been recorded by global seismic networks. In March 2000, the scientists deployed ocean bottom seismographs on the summit of Vailulu'u to listen to microseismic activity that will produce data to provide further clues to the presence of volcanic activity and help determine when and where magma moves within the volcano. www.whoi.edu /mr/pr.do?id=966   (735 words)

Santorini Volcano Eruptions continued in the 3rd century BC when the island of Thirassia was severed from Santorini, and in the 2nd century BC when the volcanic islet Palaia Kameni began to appear in the bay. The island was covered in a layer of volcanic ash 30-40 metres deep. After the eruption, all that remained of round Stronghyle was the horse-shoe shaped island we know today. www.magicaljourneys.com /Santorini/santorini-interest-volcano.html   (191 words)

Latest Volcanic Activity However, at this stage of activity, a large, major explosive eruption is not anticipated yet because disperse seismic activity may also suggest rock slips along localized faults in the volcanic structure as a response to intrusion at depth. These observations indicate that activity is presently hydrothermal in nature and occurring at shallow levels in the crater. However, there was no corresponding significant earthquake activity as the seismic network detected only two (2) high frequency volcanic quakes for the past 24 hours. www.phivolcs.dost.gov.ph /vmepd/updates/kv042002.htm   (1364 words)

Volcanic Earthquakes Earthquakes related to volcanic activity may produce hazards which include ground cracks, ground deformation, and damage to manmade structures. The second category of volcanic earthquakes are long period earthquakes which are produced by the injection of magma into surrounding rock. The volcanic tremor signal has been used successfully to predict the 1980 eruptions Mount St. Helens and the 1991 eruption of Pinatubo. www.geo.mtu.edu /volcanoes/hazards/primer/eq.html   (357 words)

Search Tuna Report for volcanic activity The range of volcanic behavior is great enough, and volcano lifetimes are long enough, that we must integrate observations of contemporary activity with historical and geological records of the recent past in order to prepare wisely for the future. Volcanic Activity this Week Report for the period midday 18 March to midday 25 March 2005 Seismic activity at Soufrière Hills Volcano remained at a low level throughout the reporting period.... VOLCANIC ACTIVITY VOLCANIC ACTIVITY on Earth can be divided into two basic types: eruptions that occur repeatedly from the same conduit and slowly build roughly circular mountains, and eruptions from any widely spaced vents, usually fissures, that create extensive lava plains.... www.searchtuna.com /ftlive2/1246.html   (3508 words)

U.S. Geological Survey, Volcano Hazards Program Volcanic ash typically covers a much larger area and disrupts the lives of far more people than the other more lethal types of volcano hazards, but information about ash and what to do with it is not readily available. Volcanic threat is the combination of hazards (the destructive natural phenomena produced by a volcano) and exposure (people and property at risk from the hazards). According to a new USGS report on NVEWS, since 1980, 45 eruptions and 15 cases of notable volcanic unrest have occurred at 33 U.S. volcanoes. volcanoes.usgs.gov   (474 words)

Mount Baker's Volcanic Activity Steam activity continued at Sherman Crater and at the Dorr fumarole field on Baker's north flank until the 1940's and 1950's, by which time steaming was uncommon. A large jet shot pressurized steam to 760 meters, new fumaroles were active, crevasses developed in the ice concentric to the crater walls, a 70-meter-wide plug of ice collapsed to form a warm water lake, and minor amounts of non-juvenile tephra were spread around the crater area. Mount Baker's most recent activity, in the mid-1800's, was at a time when permanent populations around its base were few and infrastructures, such as roads, powerlines and other structures, were virtually non-existent. www.pep-c.org /mountbaker   (602 words)

Hotbed of Volcanic Activity Found Beneath Arctic Ocean Yet the first maps and samples revealed a highly active volcanic province," said Langmuir, noting that the abundant and recent volcanic activity was both surprising and remarkable. Researchers discovered that, contrary to expectations, the exceedingly slowly spreading ridge is rife with hydrothermal vents and a hotbed of irregular volcanic activity. But based on rock samples dredged from the ocean floor and detailed sonar mapping, researchers were surprised to discover that the Gakkel Ridge is actually a hotbed of volcanic activity and hydrothermal vents. news.nationalgeographic.com /news/2003/06/0625_030625_gakkelridge.html   (859 words)

Coral Reefs Volcanic Impacts We are continuing monitoring the impacts of volcanic activity on the reefs. One of the factors leading to vegetation death is acid rain, from volcanic sulfur. On a local scale the impacts from volcanic sulfur emissions have important consequences for plant and animal life. sei.org /impacts.html   (2047 words)

USATODAY.com - Signs of volcanic activity seen on Mars Mars shows signs of geologically recent volcanic activity, and scientists find to their surprise that there might well be another volcanic blast in the Red Planet's future. The images add to evidence of volcanic activity at other Martian sites that are only 10 million years old. Crater counts are a standard method used by scientists to estimate the age of a planetary feature, because the number of craters increases over time. www.usatoday.com /tech/science/space/2004-12-22-mars-volcano_x.htm   (646 words)

East coast lacks necessary ingredients for volcanic activity That isn't likely to happen anytime soon--even by geological standards--since the geological conditions on the East Coast lack key conditions necessary for volcanic activity, says R.J. Tracy, professor of geosciences at Virginia Tech. Roughly 750 million years ago, rift-related (divergent) volcanoes erupted along the axis of what later became the Appalachians, and one remnant of that volcanic zone, with its volcanic rocks, still can be seen in Virginia at Mount Rogers. Tracy has been researching volcanic rocks since the 1970s and teaches a course on volcanoes at Virginia Tech. www.eurekalert.org /pub_releases/2004-10/vt-ecl100504.php   (319 words)

SPACE.com -- Volcanic Activity Possible on Object Beyond Neptune Earth and Mars both have volcanoes, and Jupiter's moon Io is a riot of volcanic activity. A large planet-like object out in the realm of Pluto shows signs of either a relatively recent collision or perhaps volcanic activity, astronomers said today. Quaoar, as it is known, resides in the Kuiper Belt, a region of icy objects beyond Neptune's orbit. www.space.com /scienceastronomy/kbo_volcano_041208.html   (793 words)

CNN - Volcanic activity near Mexico City - Apr. 29, 1997 CNN - Volcanic activity near Mexico City - Apr. 29, 1997 But as activity died down with the daybreak authorities decided not to evacuate the area around the volcano, which lies only 40 miles east of Mexico City. MEXICO CITY (CNN) -- Scientists were keeping a close eye on the Popocatepetl volcano in central Mexico Tuesday after red-hot rocks from small overnight eruptions ignited huge fires on grazing lands and frightened farmers on the mountainside. cnn.com /WORLD/9704/29/volcano   (305 words)

Global Volcanism Program Volcanic Activity Reports Weekly volcanic activity reports provided through a cooperative project by the U.S. Geological Survey Volcano Hazards Program and the Smithsonian Global Volcanism Program. Details about the "Volcanic Activity Reportsandquot; section of the website, including citation guidelines. Reports of recent volcanism, published by the Smithsonian since 1968, are provided by the Global Volcanism Network, a collective term for hundreds of correspondents, scientists, and other volcano observers that contribute information. www.volcano.si.edu /reports/index.cfm   (199 words)

III. Volcanic Activity One of the older and more intelligent fishermen says that from his boyhood he has known a pushing up and down, backward and forward, of the waters every time that Mauna Loa has shown activity in either of its great craters. A curious and interesting statement is made by the Hawaiian fishermen of Waikiki concerning a peculiar disturbance of the sea simultaneous with all seasons of volcanic agitation. During these months of 1874-1875 there were magnificent exhibitions of clouds reflecting volcanic fires caused by the upburst of lava fountains. www.sacred-texts.com /pac/hlov/hlov29.htm   (2336 words)

Alaska Volcano Observatory The resulting lahar (a debris flow consisting of a mixture of volcanic sediment, water, and ice) left a deposit on the unnamed glacier draining the crater to the south and caused flooding of 3 to 6 ft (1 to 2 m) above normal on Indecision Creek. Sometime earlier this summer, the southern crater rim of Chiginagak was breached, allowing a portion of the lake to drain. www.avo.alaska.edu /index.php/updates/updates.htm   (296 words)

Lassen Volcanic National Park (National Park Service) Lassen Volcanic became a national park in 1916 because of its significance as an active volcanic landscape. Lassen Volcanic National Park is located in Northeastern California at the southern terminus of the Cascade Mountains, approximately 50 miles east of Redding, California. Beneath Lassen Volcanic's peaceful forests and gem-like lakes lies evidence of a turbulent and fiery past. www.nps.gov /lavo   (296 words)

NASA Spacecraft Detects Volcanic Activity In Antarctica Future versions may be used to track dust storms on Mars, search for ice volcanoes on Europa, monitor activity on Jupiter's volcanically active moon Io. This image of the lava lake at the summit of Mt Erebus, Antarctica, obtained by the Hyperion instrument onboard NASA's Earth Observing-1 spacecraft on May 7, 2004, shows the output from the Autonomous Sciencecraft Experiment volcanic thermal detector (hot pixels are red and yellow in the main and inset images). Researchers at JPL and Goddard are testing the Autonomous Sciencecraft Experiment on Erebus and other volcanoes around the world for the next several months. www.spacedaily.com /news/antarctic-04d.html   (743 words)

Volcano World - The Web's Premier Source of Volcano Info The contact details of the responsible warning authority for volcanic crises can be found at the website of the World Organization of Volcano Observatories, a commission of IAVCEI. Take a tour of all volcanoes that have had activity since January by clicking HERE. To tour this weeks reported activity reports, CLICK HERE. volcano.und.nodak.edu   (326 words)

Volcano Products - Satellite Services Division Operations Of The Washington Volcanic Ash Advisory Center Paper presented at CAR/SAM/RAN/3 Volcanic Ash Forecast Transport And Dispersion Model (VAFTAD): www.ssd.noaa.gov /VAAC   (76 words)

Recent Volcanic Activity Interview: Dan Miller discusses volcanic activity on Mt. St. Pakistani army flies geologists to quake zone to investigate reports of volcanic activity (AP Worldstream) Latest images of red planet suggest potential for volcanic activity (AP Worldstream) www.infoplease.com /ipa/A0763388.html   (130 words)

CBC News: Warm signs detected from distant icy world LONDON - A large, icy rock at the edge of our solar system was warm at some point, a finding that suggests planetary processes like volcanic activity, astronomers say. With a diameter of about 1,300 kilometres, Quaoar is the largest known body in the Kuiper Belt, an area of icy objects that extends out from Pluto. "But we should not exclude the possibility that planetary processes such as volcanism could occur in volatile-rich bodies at these outer reaches of the solar system," he wrote. www.cbc.ca /story/science/national/2004/12/09/Quaoar041209.html   (361 words)

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