Current Alerts for U.S. Volcanoes

  • 2015-01-26 08:57:10 Kilauea Warning Orange
  • 2015-01-26 11:41:00 Shishaldin Watch Orange
  • 2015-01-26 11:41:00 Cleveland Advisory Yellow
  • 2015-01-23 11:02:44 Pagan Advisory Yellow
  • 2015-01-02 10:24:04 Anatahan Normal Green
  • 2015-01-23 10:54:56 Cascade Range Normal Green
  • 2015-01-15 12:13:49 Pavlof Normal Green
  • 2015-01-01 08:21:42 Yellowstone Normal Green
  • 2015-01-02 10:24:04 Sarigan Unassigned Unassigned

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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
Monday, January 26, 2015 11:41 AM PST (Monday, January 26, 2015 19:41 UTC)


SHISHALDIN VOLCANO (VNUM #311360)
54°45'19" N 163°58'16" W, Summit Elevation 9373 ft (2857 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Clouds have obscured the summit of the volcano and nothing observed in satellite data over the past 24 hours. Low-level eruptive activity at Shishaldin likely continues. Seismicity remains slightly above background.


CLEVELAND VOLCANO (VNUM #311240)
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

The volcano has been obscured by clouds and nothing of note has been observed in satellite data over the past day. No significant activity was detected in seismic or infrasound (air pressure) data.



OTHER ALASKA VOLCANOES

Other Alaska volcanoes show no signs of significant unrest: http://www.avo.alaska.edu/activity/

AVO scientists conduct daily checks of earthquake activity at all seismically-monitored volcanoes, examine web camera and satellite images for evidence of airborne ash and elevated surface temperatures, and consult other monitoring data as needed.

For definitions of Aviation Color Codes and Volcano Alert Levels, see: http://www.avo.alaska.edu/color_codes.php

FOR MORE INFORMATION ON ALASKA VOLCANOES: http://www.avo.alaska.edu

SUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http://volcanoes.usgs.gov/vns/

FOLLOW AVO ON FACEBOOK: https://facebook.com/alaska.avo

FOLLOW AVO ON TWITTER: https://twitter.com/alaska.avo

CONTACT INFORMATION:
John Power, Scientist-in-Charge, USGS
jpower@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jeff.freymueller@gi.alaska.edu (907) 322-4085

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.



AVO Alert Archive Search
CASCADES VOLCANO OBSERVATORY WEEKLY UPDATE
Friday, January 23, 2015 10:54 AM PST (Friday, January 23, 2015 18:54 UTC)


CASCADE RANGE VOLCANOES
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal levels of background seismicity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State; and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon.

Recent Observations: Cascade Range volcanoes of Washington and Oregon remained seismically quiet throughout the week. Field crews performed repair and maintenance of seismic and hydrologic monitoring stations near Mount St. Helens.





Mount St. Helens Seismic Information
CVO Alert Archive Search
HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Monday, January 26, 2015 8:57 AM HST (Monday, January 26, 2015 18:57 UTC)


This report on the status of Kilauea volcanic activity, in addition to maps, photos, and Webcam images (available at http://hvo.wr.usgs.gov/activity/kilaueastatus.php), was prepared by the USGS Hawaiian Volcano Observatory (HVO). All times are Hawai`i Standard Time.

KILAUEA VOLCANO (VNUM #332010)
19°25'16" N 155°17'13" W, Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: ORANGE

Activity Summary: Kīlauea Volcano continues to erupt at its summit and within its East Rift Zone. Activity near the northern-most edge of the June 27th flow continues and after several days without significant advance, its active leading edge advanced some 50 yards (0.45 m), bringing it to 0.36 mi (580 m) from Highway 130 in the area west of the Pahoa Fire and Police Stations. Breakouts along the margins of this lobe are also widening the flow. No significant changes are noted from Pu`u O`o or Kīlauea summit.

June 27th Lava Flow Observations: This morning’s update from County Civil Defense notes that, after several days of continued widening of the flow tip but without signs of significant advance, the breakout along the north side of the flow advanced roughly 50 yards (~45 m). The leading edge or tip of this breakout is now roughly 0.36 mi (580 m) from the stretch of Highway 130 west of the Pahoa Fire and Police Stations. Upslope breakouts along the north side, some 1 to 1-1/2 mi (~1.6 to 2.4 km) behind the flow front remained active but have not advanced significantly. Additional active breakouts within the flow field and along the flow margins were also noted and smoke from resulting fires was evident in HVO Webcams. The original front of the June 27th lava flow and the south margin breakouts remain stalled.

Puʻu ʻŌʻō Observations: No significant changes are noted since yesterday in monitoring data streams from instruments deployed near Pu`u O`o. A few persistent incandescent spots are visible in the Web cam images. Tilt measurements obtained from instruments at Pu`u O`o are plausibly reflecting effects of rainfall in that area during the past 24 hours. The most recent measurement of sulfur dioxide emissions from all East Rift Zone vents was about 200 tonnes per day on January 7.

Summit Observations: Halema`uma`u Overlook vent lava lake levels continue to fluctuate and the lava lake continues to spatter. Based on HVO Webcam images, the lava-lake level looks to have dropped slightly since Friday when the measured distance to the lava lake surfaced was measured at 42 m below the floor of Halema`uma`u. Summit tilt shows no significant changes since recovery from the January 20 DI-cycling. Emission rates of sulfur dioxide ranged from around 4,500 to 7,600 tonnes/day during the week ending January 13.




Sulfur Dioxide Emission Rate estimation caveat: Starting in 2014, we report the emission rate estimated by a new, more accurate method. The numbers increase by a factor of 2-4 but the actual emission rate has not changed. For more on this reporting change, please read http://hvo.wr.usgs.gov/volcanowatch/view.php?id=207

Background:
Summit The summit lava lake is within an elliptical crater (unofficially called the Overlook crater), which has dimensions of approximately 160 m (520 ft) by 210 m (690 ft), inset within the eastern portion of Halemaʻumaʻu Crater. The lake level has varied from about 25 m to more than 200 m (out of sight) below the floor of Halemaʻumaʻu Crater. The Overlook crater has been more-or-less continuously active since it opened during a small explosive event on March 19, 2008. The lake level responds to summit tilt changes with the lake generally receding during deflation and rising during inflation. Since 2013, the lava level has been typically between 30 m (100 ft) and 60 m (200 ft) below the floor of Halemaʻumaʻu Crater. Small collapses in the Overlook crater are common, and over time have resulted in a gradual enlargement of the Overlook crater. The ambient SO2 concentrations near the vent vary greatly, but are persistently higher than 10 ppm and frequently exceed 50 ppm (upper limit of detector) during moderate trade winds. The gas plume typically includes a small amount of ash-sized tephra (mostly fresh spatter bits and Pele's hair from the circulating lava lake). The heaviest pieces are deposited onto nearby surfaces while the finer bits can be carried several kilometers before dropping out of the plume.

East Rift Zone vents and flow field The eruption in Kīlauea's middle East Rift Zone started with a fissure eruption on January 3, 1983, and continued with few interruptions at Puʻu ʻŌʻō Cone, or temporarily from vents within a few kilometers to the east or west. A fissure eruption on the upper east flank of Puʻu ʻŌʻō Cone on Sept. 21, 2011, drained the lava lakes and fed a lava flow (Peace Day flow) that advanced southeast through the abandoned Royal Gardens subdivision to the ocean within Hawaiʻi Volcanoes National Park in early December 2011. The flows stalled and re-entered the ocean starting on November 24, 2012, until activity started to decline and the ocean entry ceased in August 20, 2013; the flow was dead by early November, 2013. The Kahaualeʻa flow, which started from the spatter cone/lava lake at the northeast edge of the Puʻu ʻŌʻō crater floor in mid-January 2013 was dead by late April, but a new flow (informally called Kahaualeʻa 2) became active in the same area in early May 2013, waxing with inflation and waning with deflation. The Kahaualeʻa 2 flow died following the onset of a new breakout from the northeast flank of Puʻu ʻŌʻō on June 27, 2014. The June 27th flow advanced to the northeast, confined to old grounds cracks for part of its length, and has been slowly approaching the town of Pāhoa.

Hazard Summary:
East Rift Zone vents and flow field Lava flows from the June 27 breakout have advanced into Pāhoa and may threaten residential areas depending on their level of activity and advance rate. Near-vent areas could erupt or collapse without warning with spatter and/or ash being wafted within the gas plume. In addition, potentially-lethal concentrations of sulfur dioxide gas may be present within 1 km downwind of vent areas. Active lava flows within forested areas can produce methane blasts capable of propelling rocks and other debris into the air. All recently active lava flows are within Hawaiʻi Volcanoes National Park and adjacent State land managed by the Department of Land and Natural Resources or the Office of Hawaiian Affairs.

Kīlauea Crater Ash and Pele's hair can be carried several kilometers downwind, and potentially-lethal concentrations of sulfur dioxide can be present within 1 km downwind.

Viewing Summary:
East Rift Zone flow field The June 27th lava flow is currently within the Kahaualeʻa Natural Area Reserve, which has been closed by the Hawaii State Department of Natural Land and Resources (DLNR) due to the ongoing volcanic hazards (http://dlnr.hawaii.gov/ecosystems/nars/reserves/hawaii-island/kahaualea/), and the Wao Kele o Puna Forest Reserve, also closed by DLNR and the Office of Hawaiian Affairs (http://dlnr.hawaii.gov/blog/2014/09/12/nr14-113/). According to the Hawaii County Civil Defense website (http://www.hawaiicounty.gov/active-alerts/): "The public is reminded that the flow is not visible and cannot be accessed from any public areas."

Puʻu ʻŌʻō Cone and Kīlauea Crater These areas are within Hawaiʻi Volcanoes National Park; Park access and viewing information can be found at http://www.nps.gov/havo/planyourvisit/lava2.htm.

Definitions of Terms Used:

CD: Hawai`i County Civil Defense

composite seismic events: is a seismic signal with multiple distinct phases that has been recorded frequently at HVO from the Halema`uma`u Overlook vent area since its explosive opening in March, 2008. For the composite events recorded at Halema`uma`u, we typically see an initial high frequency vibration lasting for a few seconds that have been correlated with rockfalls. This is followed by about 30 seconds of a long-period (LP) oscillation with an approximately 2- to 3-second period. The final phase of the signal is several minutes of a very-long-period (VLP) oscillation with an approximately 25- to 30-second period. The LP signals are interpreted to be from the uppermost portion of the conduit and VLP signals are interpreted to be fluid passing through a deep constriction in the conduit through which lava rises to the pond surface we see in the webcam.

DI tilt event: DI is an abbreviation for 'deflation-inflation' and describes a geophysical event of uncertain volcanic significance. DI events are recorded by tiltmeters at Kilauea summit as an abrupt deflation of up to a few microradians in magnitude lasting several hours (weak DI events) to 2-3 days (strong DI events) followed by an abrupt inflation of approximately equal magnitude. The tilt events are usually accompanied by an increase in summit tremor during the deflation phase. A careful analysis of these events suggests that they may be related to changes in magma supply to a storage reservoir at less than 1 km depth, just east of Halema`uma`u crater. Usually, though not always, these changes propagate through the magma conduit from the summit to the east rift eruption site, as many of the DI events at Kilauea summit are also recorded at a tiltmeter at Pu`u `O`o delayed by several hours. DI events often correlate with lava pulses and/or pauses in the eruption at the Pu`u `O`o/Peace Day vents.

glow: light from an unseen source; indirect light.

Halema`uma`u Overlook vent: has been difficult to describe concisely. The vent is actually a pit, or crater, in the floor of the larger Halema`uma`u Crater which is, in turn, in the floor of the larger Kilauea caldera or crater - a crater within a crater within a crater. It is easiest to describe as a pit inset within the floor of a crater within a caldera. The pit is about 160 m (525 ft) in diameter at the Halema`uma`u Crater floor, is about 50 m in diameter at a depth of 200 m (660 ft) below the Halema`uma`u Crater floor. From November, 2009, to now, a lava pond surface has been visible in this pit.

incandescence: the production of visible light from a hot surface. The term also refers to the light emitted from a hot surface. The color of the light is related to surface temperature. Some surfaces can display dull red incandescence at temperatures as low as 430 degrees Centigrade (806 degrees Fahrenheit). By contrast, molten lava displays bright orange to orange-yellow light from surfaces that are hotter than 900 degrees C (1,650 degrees F).

LPs: - Long Period (LP) events refer to earthquakes that have a lower frequency or tone than typical earthquakes and are usually attributed to the resonance of fluid- and gas-filled conduits, cracks and/or chambers. Because of their association with fluids and gases, LP earthquakes in the vicinity of volcanoes can be useful for monitoring purposes. At other volcanoes LP earthquakes are also known as low-frequency earthquakes, tornillos or B-type earthquakes.

mauka, makai: Hawaiian terms for directions relative to the coast - makai or ma kai (toward the coast) and mauka or ma uka (toward the highlands or away from the coast).

microradian: a measure of angle equivalent to 0.000057 degrees.

pali: Hawaiian term for cliff or precipice.

tephra: all material deposited by fallout from an eruption-related plume, regardless of size.

tonne (t): metric unit equal to 1,000 kilograms, 2,204.6 lbs, or 0.984 English tons.

More definitions with photos can be found at http://volcanoes.usgs.gov/images/pglossary/index.php.

Additional Information:
For a definition of volcano alert levels and aviation color codes: http://volcanoes.usgs.gov/activity/alertsystem/index.php

Maps, photos, Webcam views, and other information about Kilauea Volcano are available at http://volcanoes.usgs.gov/hvo/activity/kilaueastatus.php. A daily update summary is available by phone at (808) 967-8862.

A map with details of earthquakes located within the past two weeks can be found at http://hvo.wr.usgs.gov/seismic/volcweb/earthquakes/

HVO Contact Information: askHVO@usgs.gov

The Hawaiian Volcano Observatory is one of five volcano observatories within the U.S. Geological Survey and is responsible for monitoring volcanoes and earthquakes in Hawai`i.



HVO Alert Archive Search
CALIFORNIA VOLCANO OBSERVATORY MONTHLY UPDATE
U.S. Geological Survey
Friday, January 16, 2015 9:02 PM PST (Saturday, January 17, 2015 05:02 UTC)


Monitored CALIFORNIA VOLCANOES
Current Volcano Alert Level: all NORMAL
Current Aviation Color Code: all GREEN


Activity Update: All volcanoes monitored by CalVO using telemetered, real-time sensor networks exhibit normal levels of background seismicity and deformation. Volcanoes monitored include Mount Shasta, Medicine Lake Volcano, Clear Lake Volcanic Field, Lassen Volcanic Center, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.


Observations for December 1, 2014 (0000h PDST) through December 31, 2014 (2359h PST):
Mt Shasta: One M1.44 earthquake was detected.
Medicine Lake: No earthquakes of M1.0 or greater were detected.
Lassen Volcanic Center: Seven earthquakes of M1.0 or greater were detected. The largest registered M2.12.
Clear Lake Volcanic Field: Two earthquakes of M1.0 were detected. The largest registered was M1.76. [Note: The typical high level of seismicity was observed under the Geysers steam field located at the western margin of CLVF. The largest event was M2.94].
Long Valley Volcanic Region: In Long Valley Caldera, 17 earthquakes of M1.0 or greater were detected (M2.17 maximum). In the Mono Craters region, two earthquakes of M1.0 or greater were detected (M1.50 maximum), and one M1.10 earthquake was detected under Mammoth Mountain. [Note: The typical high level of seismicity was observed south of the caldera in the Sierra Nevada range. The largest registered M2.92].
Ubehebe Craters:No earthquakes at or above M1.0 were detected.
Salton Buttes: The typical high level of seismicity was observed in the vicinity of the buttes, with 13 earthquakes of M1.0 or greater. The largest registered was M4.19.
Coso Volcanic Field: The typical high level of seismicity was observed, with 13 earthquakes M1.0 or greater. The largest registered M1.50.

The U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted. For a definition of alert levels see http://volcanoes.usgs.gov/activity/alertsystem/icons.php.

As part of the U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory aims to advance scientific understanding of volcanic processes and lessen the harmful impacts of volcanic activity in the volcanically active areas of California and Nevada. For additional USGS CalVO volcano information, background, images, and other graphics visit http://volcanoes.usgs.gov/observatories/calvo/. For general information on the USGS Volcano Hazard Program http://volcanoes.usgs.gov. Statewide seismic information for California and Nevada can be found at http://earthquake.usgs.gov/earthquakes/recenteqscanv/.







CalVO Alert Archive Search
NORTHERN MARIANA ISLANDS WEEKLY UPDATE
Friday, January 23, 2015 11:02 AM PST (Friday, January 23, 2015 19:02 UTC)


Report prepared by the U.S. Geological Survey.

PAGAN VOLCANO (VNUM #284170)
18°7'48" N 145°48' E, Summit Elevation 1870 ft (570 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Seismic, infrasound, and web camera data from Pagan Volcano remain temporarily unavailable. Pagan was mostly obscured by clouds over the past week, but no steam or gas plume was observed during periods of clear weather.

Volcanic gas from Pagan may be noticed downwind of the volcano as a distinctive sulfurous odor. Additional information about volcanic gas and vog can be found on the web at this address: http://hvo.wr.usgs.gov/hazards/FAQ_SO2-Vog-Ash/main.html

Access to the island may be restricted by the CNMI government. Contact the EMO for the latest information.

OTHER NORTHERN MARIANA ISLAND VOLCANOES

Equipment failure on 29 December 2014 resulted in the loss of seismic data from Sarigan and Anatahan, so we are no longer monitoring these volcanoes with local data. Repair of monitoring systems will be attempted in late January. Analysis of satellite images showed no signs of activity at these or any of the other Northern Mariana Islands volcanoes.

For definitions of Aviation Color Codes and Volcano Alert Levels, see: http://volcanoes.usgs.gov/activity/alertsystem/index.php

SUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http://volcanoes.usgs.gov/vns/

CONTACT INFORMATION:
USGS Northern Mariana Duty Scientist (808) 967-8815
http://volcano.wr.usgs.gov/cnmistatus.php

CNMI Homeland Security and Emergency Management Office (670) 664-2216
http://www.cnmihsem.gov.mp/






NMI Alert Archive Search
YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE
Thursday, January 1, 2015 8:21 AM MST (Thursday, January 1, 2015 15:21 UTC)


YELLOWSTONE VOLCANO (VNUM #325010)
44°25'48" N 110°40'12" W, Summit Elevation 9203 ft (2805 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Seismicity

During December 2014, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 75 earthquakes were located in the Yellowstone National Park region. The largest event was a small earthquake of magnitude 2.4 on December 15, at 12:02 PM MST, located about 14 miles southwest of West Thumb in Yellowstone National Park, Wyoming. There were no earthquake swarm sequences during the month of December.

Yellowstone earthquake activity in December is at relatively low background levels

Ground deformation

After a fascinating year of ups and downs, deformation in north-central Yellowstone has returned to near background levels.

Caldera GPS stations continue to record the pattern of uplift that has persisted since the beginning of 2014. An example can be found at:

http://www.unavco.org/instrumentation/networks/status/pbo/data/HVWY (click on Static Plots / Time Series)

The Yellowstone Volcano Observatory (YVO) provides long-term monitoring of volcanic and earthquake activity in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.

YVO Member agencies: USGS, Yellowstone National Park, University of Utah, University of Wyoming, UNAVCO, Inc., Wyoming State Geological Survey, Montana Bureau of Mines and Geology, Idaho Geological Survey

CONTACT INFORMATION:
Jacob Lowenstern, Scientist-in-Charge
jlwnstrn@usgs.gov






YVO Alert Archive Search