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Posts Tagged ‘Alaska Volcanoes’

Bogoslof Volcano Erupts

Posted by feww on July 10, 2017

KT-623D

Bogoslof Explodes: Volcano Alert Level Raised to WARNING, Aviation Color Code to RED

AVO/USGS Volcanic Activity Notice
Volcano: Bogoslof (VNUM #311300)
Current Volcano Alert Level: WARNING
Previous Volcano Alert Level: WATCH
Current Aviation Color Code: RED
Previous Aviation Color Code: ORANGE

Issued: Monday, July 10, 2017, 12:51 AM AKDT
Source: Alaska Volcano Observatory
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians

Volcanic Activity Summary: An eruption began at Bogoslof volcano at 07:47 UTC on July 9 (23:47 AKDT on July 9) lasting about 5 minutes followed 15 minutes later by a second explosion that lasted about 7 minutes. A small ash cloud has been detected in satellite data. Winds are towards the southeast. The Aviation Color Code is upgraded to RED and the Volcano Alert Level to WARNING. Ash trajectory models indicate that a possible trace ash fall could occur on Unalaska, but unlikely to affect Dutch Harbor.  https://www.avo.alaska.edu/

Nearby towns:

  • Unalaska 61 mi (98 km) SE
  • Nikolski 76 mi (123 km) SW
  • Akutan 93 mi (149 km) NE
  • Saint George 194 mi (312 km) NW
  • Anchorage 835 mi (1,343 km) NE

Cleveland Volcano
Color Code ORANGE / Alert Level WATCH

Pavlof Volcano
Color Code YELLOW / Alert Level ADVISORY

Hawaii Volcanoes

Kilauea Volcano
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

  • FIRE-EARTH Ref:  LMP7
  • FIRE-EARTH Science Team’s July VolcanoWatch Report is available via FEPS.
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Bogoslof Volcano Erupts

Posted by feww on March 9, 2017

Bogoslof : Large explosive eruption ejects ash 10.6 km (35,000 feet) asl

Bogoslof volcanic ash cloud at 3:15 AM Mar 8 AKST. Cloud at least 35,000 ft asl.
Img by Dave Schneider,  https://www.avo.alaska.edu/images/image.php?id=107841

HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE  [USGS]

Wednesday, March 8, 2017, 9:10 AM HST (Wednesday, March 8, 2017, 19:10 UTC)

KILAUEA VOLCANO (VNUM #332010)
19°25’16” N, 155°17’13” W, Summit Elevation 4,091 ft (1,247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary: Kīlauea Volcano continues to erupt at its summit and at the Puʻu ʻŌʻō vent on its East Rift Zone. The episode 61g lava flow from Puʻu ʻŌʻō is entering the ocean at Kamokuna and is feeding surface flows on and above the pali. These lava flows pose no threat to nearby communities at this time. The summit deflationary trend of the past 2 days reversed early this morning to an inflationary trend. The lava lake was about 34 m (~112 ft) below the Overlook crater rim this morning. Seismicity in the upper East Rift Zone did not change significantly in the past day.

Summit Observations: Tiltmeters at Kīlauea’s summit began recording an inflationary tilt early this morning, reversing the deflationary trend of the past 2 days. The lava lake was measured this morning at about 34 m (~112 ft) below the Overlook crater. Webcam views of the lava lake can be found at this webpage: http://hvo.wr.usgs.gov/cams/region_kism.php. Summit tremor continues to fluctuate in response to variations in lava lake spattering. Average daily summit sulfur dioxide emission rates were between about 6,600 and 1,900 metric tons/day during the last week in February, the most recent time when conditions permitted measurements. Seismicity in the upper East Rift Zone has returned to typical levels over the past couple of days, with just a few small earthquakes.

Puʻu ʻŌʻō Observations: Webcam images over the past 24 hours show persistent glow at long-term sources at Puʻu ʻŌʻō, including the pit on the west side of the crater that holds a small lava pond. There were no significant changes in East Rift Zone seismicity over the past 24 hours. The tiltmeter at Puʻu ʻŌʻō recorded deflationary tilt over the past day. The sulfur dioxide emission rate from all East Rift Zone vents was about 250 metric tons/day when last measured on February 22, 2017. https://hvo.wr.usgs.gov/activity/kilaueastatus.php

Pāhoehoe lava from Kilauea Volcano

Pāhoehoe lava inches towards the ocean in Hawai‘i Volcanoes NP, 3/2/17 Photo/Janice Wei.

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Pavlof rests, for now!

Posted by feww on March 31, 2016

Pavlof ash eruption blankets large area


Pavlof volcano, as seen from Cold Bay, showing deposits of March 27-28 eruption. Photo by Candace Shaack.

Date: March 29, 2016 9:06 AM
Photographer/Creator: Candace, Shaack
URL: http://www.avo.alaska.edu/images/image.php?id=93861

Alert Level: WATCH
Current Aviation Color Code: ORANGE

The eruption of Pavlof Volcano has greatly diminished in intensity over the past day… Seismic activity remains elevated at levels above background and over the past 24 hours has been characterized by occasional short-duration tremor bursts, likely associated with the low-level ash emissions.

Although the intensity of the eruption has diminished, it is possible for conditions to change at any time and more significant ash emissions may resume with little to no warning. —AVO

KILAUEA VOLCANO (VNUM #332010)
19°25’16” N, 155°17’13” W, Summit Elevation 4,091 ft (1,247 m)
Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary: Kīlauea continues to erupt in a relatively steady fashion at both the summit, where there is a circulating lava lake, and from its East Rift Zone, where surface lava flows are active northeast of the Puʻu ʻŌʻō vent. The East Rift Zone lava flow currently poses no threat to nearby communities. Earthquake rates and seismic tremor are at background levels. —HVO

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Volcano Eruption Alert: Pavlov Volcano Eruption Continues

Posted by feww on March 28, 2016

Seismic tremor at Pavlov remains at very high levels: AVO

The eruption of Pavlov Volcano continues. It began around 4 pm AKDT on Sunday (00:00UTC). Maximum ash cloud altitude of 37,000 ft (~ 11,300m) above sea level indicated.

AVO/USGS Volcanic Activity Notice

  • Volcano: Pavlof (VNUM #312030)
    • Location: N 55 deg 25 min W 161 deg 53 min
    • Elevation: 8,261 ft (2,518 m)
    • Area: Alaska Peninsula Alaska
  • Current Volcano Alert Level: WARNING
  • Current Aviation Color Code: RED
  • Issued: Monday, March 28, 2016, 8:34 AM AKDT (2016-03-28/16:34UTC)
    Source: Alaska Volcano Observatory – Notice Number: 2016/A3

Volcanic Activity Summary:

  • The eruption of Pavlov Volcano continues.
  • It began around 4 pm AKDT on Sunday (00:00UTC).
  • Seismic tremor remains at very high levels.
  • Lighting associated with the ash eruption has been detected.
  • Infrasound (pressure sensor) data from a sensor network located in Dillingham (400 miles or 650 km) also indicate sustained ash emissions.


Pavlof volcano in eruption, March 27, 2016. Photo courtesy of Colt Snapp, taken at 7:00 PM AKDT from a flight enroute to Anchorage, from Dutch Harbor. URL: http://www.avo.alaska.edu/images/image.php?id=93201

As of 7:00 AKDT (15:00 UTC) a continuous plume of ash is observed in satellite images extending for a distance of more than 400 miles (650 km) to the northeast over interior Alaska. SIGMET warning messages issued by the National Weather Service (NWS) Alaska Aviation Weather Unit indicate maximum ash cloud altitude of 37,000 ft above sea level. Please see the NWS web page for additional guidance and forecasts of ash movement. http://aawu.arh.noaa.gov/sigmets.php

Lava fountaining from the summit crater was observed throughout the night by mariners, pilots, and by residents in Cold Bay, located 37 miles (60 km) to the SW, . Volcanic mudflows are likely on the flanks of the volcano and could present a hazard in the local river valleys.

Recent Observations:  [Volcanic cloud height] 37,000 ft ASL in SIGMET
[Other volcanic cloud information] Extending for 400 miles to the NE as of 07:00 UTC.

Hazard Analysis:  [Mud flow] Mud flows on the flanks of the volcano are likely.


Satellite image showing strong ash signal (blue) extending more than 500 km (300 mi), north-northeast from Pavlof volcano, 4:19 am AKDT (12:19 UTC), March 28, 2016. Photographer/Creator:  Michelle  Coombs  URL:    http://www.avo.alaska.edu/images/image.php?id=93191

Remarks: Pavlof Volcano is a snow- and ice-covered stratovolcano located on the southwestern end of the Alaska Peninsula about 953 km (592 mi) southwest of Anchorage. The volcano is about 7 km (4.4 mi) in diameter and has active vents on the north and east sides close to the summit. With over 40 historic eruptions, it is one of the most consistently active volcanoes in the Aleutian arc. Eruptive activity is generally characterized by sporadic Strombolian lava fountaining continuing for a several-month period. Ash plumes as high as 49,000 ft ASL have been generated by past eruptions of Pavlof, and during the 2013 eruption, ash plumes as high as 27,000 feet above sea level extending as much as 500 km (310 mi) beyond the volcano were generated. The nearest community, Cold Bay, is located 60 km (37 miles) to the southwest of Pavlof.

Mt. Cleveland: Color Code YELLOW  Alert Level ADVISORY

Pavlof location map
Index map showing location of Pavlof volcano and other Alaska Peninsula volcanoes.  Credit: Janet Schaefer/AVO

Cleveland location map
Location of Cleveland volcano and other Aleutian volcanoes with respect to nearby cities and towns.  Credit: Janet Schaefer/AVO

Latest Seismic Activity along Aleutian Trench:
5.5 76km S of Nikolski, Alaska 2016-03-28 17:14:55 UTC 10.0 km
4.6 63km SSE of Nikolski, Alaska 2016-03-28 11:45:06 UTC 38.3 km
2.8 95km SSE of Nikolski, Alaska 2016-03-28 05:34:38 UTC 24.3 km
3.3 85km SSE of Nikolski, Alaska 2016-03-27 20:40:42 UTC 25.5 km
4.1 71km S of Nikolski, Alaska 2016-03-27 19:44:35 UTC 29.7 km
4.7 70km S of Nikolski, Alaska 2016-03-27 18:27:27 UTC 35.0 km
3.4 96km SSE of Nikolski, Alaska 2016-03-27 18:21:43 UTC 25.7 km
4.5 80km S of Nikolski, Alaska 2016-03-27 18:14:00 UTC 26.8 km
5.7 84km S of Nikolski, Alaska 2016-03-27 18:01:30 UTC 16.0 km

 

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Eruption of Pavlof Continues

Posted by feww on June 4, 2014

VOLCANIC HAZARD
SCENARIO 07
.

Pavlof Eruption Ongoing, Conditions Could Worsen Rapidly: AVO

Intense activity at Pavlov Volcano prompted the authorities to issue a red alert on Monday, the first in five years. The alert level has since been changed to “ORANGE.”

Plume of smoke and ash reached as high as 7,500 meters on Tuesday; however, seismic activity has decreased over the past 12 hours to much lower levels than that of Monday, Alaska Volcano Observatory (AVO) reported.

“Recent satellite data and web camera views of the eruption plume indicate that there are now two distinct parts of the plume. The part of the plume that reaches high above the volcano appears to be mainly steam and gas with minor ash present, extending south of the volcano. Additionally, pyroclastic flow activity on the north flank is producing diffuse ash emissions that result in areas of hazy air, with variable concentrations of ash below 10,000 ft.”

Ongoing pyroclastic and lahar activity have created hazardous conditions on the north flank and north side drainages heading on the volcano, said AVO, adding that large, more ash-rich plumes could develop with little or no warning.

Pavlof -AVO - 2jun14
Lava fountaining from the summit vent on Pavlof. View is from the southwest. Ash and steam clouds rise up to about 20,000 ft. ASL. Date: June 2, 2014 11:36 AM. Photo credit: AVO/ R. Kremer

Volcano: Pavlof (VNUM #312030)

Current Volcano Alert Level: WATCH
Previous Volcano Alert Level: WARNING

Current Aviation Color Code: ORANGE
Previous Aviation Color Code: RED

Issued: Tuesday, June 3, 2014, 5:54 PM AKDT (20140604/01:54UTC)
Source: Alaska Volcano Observatory (AVO)
Notice Number: 2014/A8
Location: N 55 deg 25 min, W 161 deg 53 min
Elevation: 8261 ft (2,518 m)
Area: Alaska Peninsula, Alaska

Alerts at Other Alaska Volcanoes

  • Shishaldin: Color Code: ORANGE/ Alert Level WATCH
  • Cleveland: Color Code YELLOW / Alert Level ADVISORY
  • Veniaminof: Color Code YELLOW / Alert Level ADVISORY

Pavlof location map
Index map showing location of Pavlof volcano and other Alaska Peninsula volcanoes.  Credit: Janet Schaefer/AVO

Cleveland location map
Location of Cleveland volcano and other Aleutian volcanoes with respect to nearby cities and towns.  Credit: Janet Schaefer/AVO

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