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Posts Tagged ‘Pagan’

Cleveland and Kīlauea Remain at ORANGE Alert

Posted by feww on April 6, 2012

Explosion destroys dome in Cleveland summit crater

Sudden explosions of blocks and ash may occur, while the volcano remains active, with the ash clouds rising to above 20,000 feet above sea level, AVO said.

  • Elevation:  5,676 ft (1,730 m)
  • Location: 52.8222° N, 169.945° W
  • Quadrangle: Samalga

Mt Cleveland. Photo taken at 18:00 UTC on 11 Mar 2012 while transiting north through Samalga pass. Several small explosions were detected in days prior to the time of the photo, but very little ash is observed on the upper flanks.  Credit:  Matthew Davis/NOAA.


19°25’16” N 155°17’13” W,
Summit Elevation 4091 ft (1,247 m)
Current Volcano Ale,rt Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary for past 24 hours:  The summit continued to inflate slowly while back-to-back DI events and sympathetic summit lava lake oscillations continued. Overnight, glow was visible within the Halema`uma`u gas plume and from sources within Pu`u `O`o crater. To the southeast, surface flows continued to be active on the pali and the coastal plain; there was no ocean entry. Seismic tremor levels were low; gas emissions were elevated: HVO

Kīlauea Volcano.  Active flows continued over a broad area on the coastal plain on April 5, 2012.  “This composite image combines a normal photograph and a thermal image to show the areas of active breakouts. Yellow areas are active flows while red areas are inactive, but still warm, flows. The flow front in the lower right was 1.6 km (1 mile) from the ocean,” HVO said.

Alert Level Increased for Iliamna Volcano, AK

Iliamna Activity – Color Code YELLOW Alert Level ADVISORY

Since January 2012 the earthquake rate at Iliamna Volcano has steadily increased and now exceeds normal background levels.

Iliamna Volcano. View from the SSE of Iliamna showing the prominent NE shoulder fumarole field near the summit. Note glacier disturbance (movement) on the east flank (upper Red Glacier).  Photo: Game McGimsey/AVO/USGS.


Location: Mariana Islands  (18.13 ºN,  145.8 ºE)
Elevation: 570 m
Recent Eruption: 2006
Volcanic Alert Level: ADVISORY
Aviation Color Code: YELLOW

A gas and steam plume continued to extend downwind from the summit vent throughout the past week, but there were no further reports of unrest or activity at Pagan volcano, USGS said.

Other Volcanic Activity/ Unrest (Source: GVP)

New Activity/Unrest:

Ongoing Activity:

Related Links

Posted in active volcanoes, Alaska volcanoes, hawaii volcanoes, major volcanoes, super volcanoes, US Volcanoes, volcanoes | Tagged: , , , , , , , , , , , , , , , , | Leave a Comment »

VolcanoWatch Weekly [2 July 2010]

Posted by feww on July 2, 2010

Summary of Weekly Volcanic Activity Report

[Source: SI/USGS]

New Activity/Unrest (23 June – 29 June 2010)

  • Gorely, Southern Kamchatka (Russia) —  [Group J]
  • Pagan, Mariana Islands (Central Pacific) — [Group L]
  • Tungurahua, Ecuador [Group D]
  • Ulawun, New Britain   [Group K]

NOTE: More volcanic activity/unrest may be expected in areas/groups shown in red.

Map of Volcanoes. Background Map: University of Michigan. Designed and enhanced by Fire Earth Blog. Click image to enlarge.

Ongoing Activity:

For additional information, see source.

Related Links:

Other Volcano Links:

FEWW Volcanic Activity Forecast

    Other Related Links:

    Posted in volcanic activity, volcanism, volcano, volcano alert, Volcano News, Volcano Watch | Tagged: , , , , | Leave a Comment »

    VolcanoWatch Weekly [20 May 2010]

    Posted by feww on May 20, 2010

    Summary of Weekly Volcanic Activity Report

    [Source: SI/USGS]

    New Activity/Unrest (12 May-18 May 2010)

    Map of Volcanoes. Background Map: University of Michigan. Designed and enhanced by Fire Earth Blog. Click image to enlarge.

    Ongoing Activity:

    For additional information, see source.

    Related Links:

    FEWW Volcanic Activity Forecast

    Other Related Links:

    Recent Posts on Chaitén:

    Posted in environment, volcano, Volcano Hazards, Volcano News, Volcano Watch | Tagged: , , , , , | Leave a Comment »

    VolcanoWatch Weekly [20 August 2009]

    Posted by feww on August 22, 2009

    Volcanic Activity Report: 12 August-18 August 2009

    VoW: Talang

    The Indonesian volcano Talang on the island of Sumatra had been dormant for centuries when, in April 2005, it suddenly rumbled to life. A plume of smoke rose 1000 meters high and nearby villages were covered in ash. Fearing a major eruption, local authorities began evacuating 40,000 people. Caption: James A. Phillips, NASA.

    And just to confuse the readers a little, the following caption is by

    Talang is a stratovolcano with 8 confirmed eruptions between 1833 and 1968. The volcano may have had a phreatic eruption in 1986 but the activity has not been confirmed. Most of the eruptions are moderate in size (VEI=2) and explosive. Eruptions in 1833, 1843, 1845, and 1876 were from flank vents. An eruption in 1967 and two different eruptions in 1968 were from radial fissures. The distance from the city of Padang to Talang is about 35 km. Image courtesy of the Landsat Pathfinder Project.

    Country: Indonesia
    Region: Sumatra
    Last Known Eruption: 2007
    Summit Elevation: 2,597 m (8,520 feet)
    Latitude: 0.978°S  (0°58’42″S)
    Longitude:  100.679°E (100°40’46″E)
    Source: GVP

    Talang, which forms a twin volcano with the extinct Pasar Arbaa volcano, lies ESE of the major city of Padang and rises NW of Dibawah Lake. Talang has two crater lakes on its flanks; the largest of these is 1 x 2 km wide Danau Talang. Most historical eruptions have not occurred from the summit of the volcano, which lacks a crater. Historical eruptions from Gunung Talang volcano have mostly involved small-to-moderate explosive activity first documented in the 19th century that originated from a series of small craters in a valley on the upper NE flank. Photo by Ruska Hadian, 1986 (Volcanological Survey of Indonesia). Caption: GVP.

    Authorities raise Mt. Talang alert level to highest

    The vulcanology and disaster mitigation office in West Sumatra has raised the alert status for Mt. Talang to the highest level following a 6.9-magnitude earthquake and a series of aftershocks that struck the province.

    Vulcanologist Dalipa Marjusi said Tuesday the tremors had sparked a volcanic earthquake and temblors, although eruption of the volcano remained undetected.

    “Since Sunday’s earthquake we have recorded 1,600 volcanic quakes and 700 tectonic quakes, but only 23 of them were felt,” Dalipa said.

    Fog has blanketed the summit of the 2,597-meter volcano for the last two days, making it difficult to see ash or lava that might be erupting from its crater.

    The volcano last spewed hot ash last April.

    A seven-strong team from the directorate general of vulcanology and disaster mitigation have arrived in Padang from Bandung to monitor the volcano’s activities.

    Talang is the 6th listed volcano from top left.

    New activity/unrest:

    Source: Global Volcanism Program (GVP) – SI/USGS Weekly Volcanic Activity Report


    IG reported that on 4 August seismicity from Reventador increased and periods of tremor frequently saturated the seismic stations. On 6 August, incandescent blocks were ejected from the crater. Thermal images revealed a linear area of higher temperatures, confirming the presence of a new lava flow on the S flank.

    Based on analyses of satellite imagery, the Washington VAAC reported that on 14 August a 2-hour-long thermal anomaly detected over Pagan was followed by a small emission. The emission, hotter than its surroundings, drifted NW and quickly dissipated. [Source: GVP]

    Ongoing Activity:

    Related Links:

    FEWW Links:

    Posted in Volcanic Activity Report, volcanism, Volcano Hazard, volcanoes, VolcanoWatch | Tagged: , , , , , , , | Leave a Comment »

    Volcano Watch Weekly: 23 April 2009

    Posted by feww on April 23, 2009

    Volcanic Activity Report: 15 April – 21 April 2009

    Source: Global Volcanism program (GVP) – SI/USGS Weekly Volcanic Activity Report

    New activity/unrest:

    • Ebeko, Paramushir Island  (Russia)
    • Fernandina, Galápagos Islands  (Ecuador)
    • Kliuchevskoi, Central Kamchatka (Russia)
    • NW Rota-1, Mariana Islands (Central Pacific)
    • Pagan, Mariana Islands (Central Pacific)
    • Paluweh, Lesser Sunda Islands (Indonesia)

    VoW: Shasta

    Volcano: Mount Shasta
    Location: Siskiyou County, California
    Latitude: 41.40 N
    Longitude: 122.18 W
    Height: 4,317 Meters  (14,161 Feet)
    Type: Stratovolcano
    Composition: Silicic andesite to dacite
    Source: USGS (Cascades Volcano Observatory)

    Mount Shasta and Shastina, California. USGS Photograph taken by Lyn Topinka, 1984 .

    From: Miller, 1980, Potential Hazards from Future Eruptions in the Vicinity of Mount Shasta Volcano, Northern California: USGS Bulletin 1503

    Mount Shasta is located in the Cascade Range in northern California about 65 kilometers (40 miles) south of the Oregon-California border and about midway between the Pacific Coast and the Nevada border. One of the largest and highest of the Cascade volcanoes, snowclad Mount Shasta is near the southern end of the range that terminates near Lassen Peak. Mount Shasta is a massive compound stratovolcano composed of overlapping cones centered at four or more main vents; it was constructed during a period of more than 100,000 years. … Two of the main eruptive centers at Mount Shasta, the Shastina and Hotlum cones were constructed during Holocene time, which includes about the last 10,000 years.

    For more information including eruptive history and probable future potential hazard see: Mount Shasta and Vicinity, California

    The most voluminous of the Cascade volcanoes, northern California’s Mount Shasta is a massive compound stratovolcano composed of at least four main edifices constructed over a period of at least 590,000 years.
    Roughly 46 cu km of an ancestral Shasta volcano was destroyed by one of Earth’s largest known Quaternary subaerial hummocky debris avalanches, which filled the Shasta River valley NW of the volcano about 350,000 year ago.  The Hotlum cone, forming the present summit, and the Shastina lava dome complex were constructed during the early Holocene, as was the SW flank Black Butte lava dome. Eruptions from these vents have produced pyroclastic flows and mudflows that affected areas as far as 20 km from the summit. Eruptions from Hotlum cone continued throughout the Holocene. Shasta’s only historical eruption was observed from the ship of the explorer La Perouse off the California coast in 1786.  Photo by Dave Wieprecht, 1995 (U.S. Geological Survey). Caption: GVP

    The deposits of an exceptionally large debris avalanche extend from the base of Mount Shasta volcano northward across the floor of Shasta Valley in northern California. The debris-avalanche deposits underlie an area of about 675 square kilometers, and their estimated volume is at least 45 cubic kilometers. Radiometric limiting dates suggest that the debris avalanche occurred between about 300,000 and 380,000 years ago. Hundreds of mounds, hills, and ridges formed by the avalanche deposits are separated by flat areas that slope generally northward at about 5 meters per kilometer. The hills and ridges are formed by the block facies of the deposits, which includes masses of andesite lava tens to hundreds of meters across as well as stratigraphic successions of unconsolidated deposits of pyroclastic flows, lahars, air-fall tephra, and alluvium, which were carried intact within the debris avalanche. The northern terminus of the block facies is near Montague, at a distance of about 49 kilometers from the present summit of the volcano. The flat areas between hills and ridges are underlain by the matrix facies, which is an unsorted and unstratified mudflowlike deposit of sand, silt, clay, and rock fragments derived chiefly from the volcano. Boulders of volcanic rock from Mount Shasta are scattered along the west side of Shasta Valley and in the part of Shasta Valley that lies north of Montague, at heights of as much as 100 meters above the adjacent surface of the debris-avalanche deposits. The boulders represent a lag that was formed after the main body of the avalanche came to rest, when much of the still-fluid matrix facies drained away and flowed out of Shasta Valley down the Shasta River valley and into the Klamath River. About 300 years ago, three rockfall-debris avalanches occurred from domes at the Chaos Crags eruptive center near Lassen Peak. The Chaos Crags avalanches traveled as far as 4.3 kilometers from their source areas. USGS Photograph taken September 22, 1982, by Harry Glicken. Caption: CVO

    Mount Shasta, California Debris Avalanche Deposit. Source: USGS – CVO

    Ongoing Activity:

    FEWW Volcanic Forecast:

    (see: Sumatra’s Mt Kerinci Erupts )

    1. The Loyalty – New Hebrides  Arc Collision. Intense volcanic activity should be expected throughout 2009 and beyond along the New Hebrides arc, the Vanatu region (also to the north to include Solomon Island and Santa Cruz Island), possibly continued along the New Hebrides Trench (to include Matthew and Hunter Island). Volcanoes that are located in the above-described area include:

    • Savo (Solomon Island)
    • Tinakula (Santa Cruz Island – SW Pacific)
    • Suretamatai
    • Motlav
    • Gaua
    • Mere Lava
    • Aoba
    • Ambrym
    • Lopevi
    • Kuwae
    • North Vate
    • Traitor’s Head
    • Yasur
    • Eastern Gemini Seamount
    • Matthew Island
    • Hunter Island

    2. Pacific Plate subduction beneath the Okhotsk Plate. Subduction of the Pacific Plate beneath the Okhotsk Plate continues to create Intense volcanism. Starting 2009, however, a much greater than the average number of volcanoes located on the Kuril Islands island arc, Kamchatka volcanic arc and Japan trench to the south may erupt with renewed intensity.

    Related Link and FEWW previous forecasts:

    Posted in Chaiten, Galapagos Islands, Koryaksky, volcanic activity, volcanism | Tagged: , , , , | Leave a Comment »

    Pagan Volcano Erupts

    Posted by feww on April 18, 2009

    Pagan Volcano on Pagan, Northern Mariana Islands, Erupts

    Pagan Volcano on Pagan, Northern Mariana Islands, about 500 km north of Guam, erupted on Friday sending smoke and steam into the atmosphere.

    The US national weather service issued a haze alert for the Mariana Islands after Pagan  erupted on Friday. NWS said residents in Guam have nothing to worry about [for now] as winds are driving the smoke away from Guam.

    If the wind direction changes, however, ash and haze may be redirected toward populated islands of Saipan and Guam SSW of the Marianas.

    The Pagan volcano is believed to have erupted seven times since 1985. [See: Pagan Eruptive History]


    Country: United States
    Region: Mariana Islands, Pacific Ocean (East of Philippine Sea)
    Volcano Type: Stratovolcanoes
    Last Known Eruption: 2006
    Summit Elevation: 570 m (1,870 feet)
    Latitude: 18.13°N (18°8’0″N)
    Longitude: 145.80°E (145°48’0″E)

    Pagan Island, the largest and one of the most active of the Mariana Islands volcanoes, consists of two stratovolcanoes connected by a narrow isthmus. Both North and South Pagan stratovolcanoes were constructed within calderas, 7 and 4 km in diameter, respectively. The 570-m-high Mount Pagan at the NE end of the island rises above the flat floor of the northern caldera, which probably formed during the early Holocene. South Pagan is a 548-m-high stratovolcano with an elongated summit containing four distinct craters. Almost all of the historical eruptions of Pagan, which date back to the 17th century, have originated from North Pagan volcano. The largest eruption of Pagan during historical time took place in 1981 and prompted the evacuation of the sparsely populated island. Photo by Norm Banks, 1983 (U.S. Geological Survey). Caption: GVP.

    Northern Mariana Islands

    Made up of fifteen islands, the Northern Mariana Islands are located east of the  Philippine Sea about 500 km north of Guam, with a population of about 82,000 (most recent estimate).  Only three of the islands, Rota, Saipan (the largest island and capital of Northern Mariana islands with a population of about 65,000) and Tinian have a significant population, compared with the islands of Agrihan and Alamagan, which have just a few residents. The  remaining ten islands are unpopulated.

    Map of the Northern Mariana Islands by the US Department of Interior.

    Pagan Erupted in 2006 – GVP Archives (6-12 December 2006)

    During 4-5 December, residents 3 km SW of Pagan reported ashfall that accumulated in their camp at a rate of about 6.4 mm per day. They also described a plume from the summit that rose to an altitude of 640 m (2,100 ft) a.s.l. and a sulfur smell that occasionally wafted through their camp. Based on satellite imagery, the Washington VAAC reported a gas-and-ash plume that drifted mainly W on 5, 6, and 8 December. Satellite imagery showed no further activity through 11 December.

    Pagan Erupted in 1981

    A fissure that formed during an eruption of Pagan volcano in the Mariana Islands in 1981 cuts across the summit of the volcano. Three principal vents were active along the fissure. A cinder cone (foreground) was constructed on the north flank, and vents on the north and south rims of the summit crater fed lava flows that traveled down the flanks of North Pagan volcano. This June 16, 1981 photo shows South Pagan volcano at the upper right. Photo by U.S. Navy, 1981. Caption: GVP.

    Posted in Agrihan, Alamagan, Guam, Tinian, volcanism | Tagged: , , , , | 2 Comments »