Current Alerts for U.S. Volcanoes

  • 2014-07-22 08:15:48 Kilauea Watch Orange
  • 2014-07-22 11:28:45 Shishaldin Watch Orange
  • 2014-07-22 11:28:45 Cleveland Advisory Yellow
  • 2014-07-18 09:44:30 Pagan Advisory Yellow
  • 2014-07-22 11:28:45 Pavlof Advisory Yellow
  • 2014-07-22 11:28:45 Semisopochnoi Advisory Yellow
  • 2014-07-18 14:20:57 Cascade Range Normal Green
  • 2014-07-21 07:30:23 Haleakala Normal Green
  • 2014-07-21 07:30:23 Hualalai Normal Green
  • 2014-07-21 07:30:23 Mauna Kea Normal Green
  • 2014-07-21 07:30:23 Mauna Loa Normal Green
  • 2014-07-09 15:57:07 Veniaminof Normal Green
  • 2014-07-02 06:13:07 Yellowstone Normal Green
  • 2014-07-21 07:30:23 Lo`ihi Unassigned Unassigned

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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
Tuesday, July 22, 2014 11:28 AM PDT (Tuesday, July 22, 2014 18:28 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

Low-level eruptive activity continues. Elevated surface temperatures in the summit crater were observed in satellite images over the past day. Web camera observations mostly obscured by clouds. No significant activity noted in seismic data.

SEMISOPOCHNOI VOLCANO (VNUM #311060)
51°55'44" N 179°35'52" E, Summit Elevation 2625 ft (800 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Earthquakes continue to be recorded, but are decreasing in number and magnitude. Satellite observations obscured by clouds over the past day. AVO has received no reports from pilots or mariners of any unusual activity.

PAVLOF VOLCANO (VNUM #312030)
55°25'2" N 161°53'37" W, Summit Elevation 8261 ft (2518 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Satellite and web camera observations obscured by clouds. No significant activity noted in seismic data.

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

Satellite observations obscured by clouds over the past day. AVO has received no reports from pilots or mariners of any unusual activity.

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:
Dave Schneider, Acting Scientist-in-Charge, USGS
djschneider@usgs.gov (907) 786-7497

Jessica Larsen, Acting Coordinating Scientist, UAFGI
faust@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, July 18, 2014 2:20 PM PDT (Friday, July 18, 2014 21:20 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: Activity at Cascade Range volcanoes has remained at background levels during the past week. Maintenance and repair work was performed at monitoring sites in and near Crater Lake.





Mount St. Helens Seismic Information
CVO Alert Archive Search
HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE
Tuesday, July 22, 2014 8:15 AM HST (Tuesday, July 22, 2014 18:15 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: WATCH
Current Aviation Color Code: ORANGE

Activity Summary: Kīlauea continued to erupt at its summit and within the East Rift Zone, and gas emissions remained elevated. There was no significant change in tilt recorded at the summit, and the lava lake level was relatively steady. At the middle East Rift Zone, lava flows continued to erupt from the northeast flank of Puʻu ʻŌʻō cone, spreading to the northeast.

Recent Summit Observations: Summit tiltmeters recorded no significant change in tilt over the past 24 hours. The lava lake level fluctuated gently but was generally about 35 m below the Overlook crater rim. Seismic tremor varied between hours-long periods of low tremor and tremor dropouts. Twenty-one earthquakes were strong enough to be located beneath Kīlauea Volcano: 5 beneath the summit, 3 in the East Rift Zone, 3 in the Southwest Rift Zone, 6 on south flank faults, 3 in the Kaʻōiki Pali area, and 1 in the Koaʻe fault zone. GPS receivers spanning the summit caldera recorded variations of up to about 1 cm since early July, but little overall change in length. During the week ending on 07/15/14, the elevated summit sulfur-dioxide emission rate was 4,200-6,300 tonnes/day (see caveat below), and a tiny amount of particulate material was carried aloft by the plume.

Recent East Rift Zone Observations: Lava flows advanced slowly toward the northeast in two main lobes. The most distant was about 2 km from the vent on the northeast flank of Puʻu ʻŌʻō on July 18. Rainfall at Puʻu ʻŌʻō over the past day prevents meaningful interpretation of the tilt signal recorded there. Small lava ponds were present within the two southeastern pits in the crater floor, and glow above the other two pits indicated lava was at least close to the surface there as well. The most recent sulfur-dioxide emission-rate measurement was 400 tonnes per day (from all East Rift Zone sources) on July 17, 2014; emission rates have typically ranged between 150 and 450 t/d since July 2012.



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. During 2013 and early 2014, 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.

Hazard Summary:
East Rift Zone vents and flow field Lava flows from the June 27 breakout pose no immediate threat to residential areas. 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 Most of the flow field is within the closed-access Kahaualeʻa Natural Area Reserve (NAR) or the Wao Kele o Puna Forest Reserve (DLNR, OHA) and can only be viewed from the air. Under favorable weather conditions at night, distant glow from the active flows can be seen from the County Viewing Area at Kalapana (Lava hotline 961-8093) and from the end of the Chain of Craters Road and a few other areas within Hawaiʻi Volcanoes National Park.

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:

ash: tephra less than 2 mm (5/64 inches) in size.

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.

rise/fall events: one of the episodic behaviors exhibited by the summit lava lake starting in 2009. An event starts with a rise in lava level, a decrease in high-frequency summit tremor amplitude, a decrease or total stoppage of spattering, and a small decrease in tilt. After a period of minutes to hours, the lava will abruptly drain back to its previous level amidst resumed vigorous spattering, seismic tremor amplitude will increase for a short time (a seismic tremor burst) before resuming background levels, and summit tilt will return to its previous level. Gas emissions decrease significantly during the high lava stand (the plume gets wispy), and resume during its draining phase. Taken together, the geophysical characteristics suggest that, during the high lava stand, lava is puffed up with gas trapped under the lava lake crust.

seismic tremor dropout: these behaviors are identical to rise/fall events except that the lava lake level doesn't rise or fall significantly. High-frequency seismic tremor, gas emissions, and spattering decrease abruptly during a dropout. A dropout can end with a burst of seismic tremor and a significant pulse of gas emissions.

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
Wednesday, July 9, 2014 6:19 PM PDT (Thursday, July 10, 2014 01:19 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 June 1, 2014 (0000h PDST) through June 30, 2014 (2359h PDST):
Mt Shasta:: Three earthquakes of M1.0 or greater were detected with a maximum of M1.83.
Medicine Lake: One earthquake of M1.0 or greater (M2.01).
Lassen Volcanic Center: Two earthquakes of M1.0 or greater were detected with a maximum of M1.67.
Clear Lake Volcanic Field: Eight M1.0 or greater earthquakes were detected with a maximum of M2.18. [Note: Typical high level of seismicity was observed under the Geysers steam field located at the western margin of CLVF with a maximum of M2.87].
Long Valley Volcanic Region: Seventy-three earthquakes of M1.0 or greater were located in the Long Valley Caldera with the largest events registering M2.41, M2.32, M2.18. The M2.18 event was the largest within a brisk, but short swarm of > 180 earthquakes occurring on June 27-28 at a depth of 6-7 km beneath Hwy 203 in Mammoth Lakes, midway between the water treatment plant and the Highway 395-203 junction. No ground deformation was associated with the swarm, and it posed no immediate hazard. North of the caldera, only one earthquake was detected along the Mono-Inyo chain (M2.07), and no earthquakes M1.0 or greater were detected below Mammoth Mountain on the western rim of the caldera. [Note: The typical high level of seismicity was observed south of the caldera in the Sierra Nevada range with a maximum of M2.88].
Ubehebe Craters: No earthquakes at or above M1.0 were detected.
Salton Buttes:Only one earthquake detected at or above M1.0 (M1.52).
Coso Volcanic Field: The typical high level of seismicity was observed, with nine earthquakes above M1.0 and greater with a maximum of M1.54.

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, July 18, 2014 9:44 AM PDT (Friday, July 18, 2014 16:44 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

Low-level unrest continued at Pagan Volcano throughout the past week. A steam and gas plume was visible in web camera and satellite images during periods of clear weather. Low-level seismic activity is ongoing.

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

Other Northern Mariana Island volcanoes volcanoes show no signs of significant unrest.
USGS conduct daily checks of earthquake activity at Pagan, Sarigan, and Anatahan 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
Wednesday, July 2, 2014 6:13 AM MDT (Wednesday, July 2, 2014 12:13 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 June 2014, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 265 earthquakes were located in the Yellowstone National Park region. The largest event was a small earthquake of magnitude 3.5 on June 4, at 06:16 AM MDT, located about 13 miles (19 km) south-southwest of Mammoth, Yellowstone National Park. This event was reported felt in Yellowstone National Park.

June seisimicity is primarily a result of the ongoing north-south trending series of earthquakes, over 7 miles (11 km) in length, which began in September, 2013 and continued in June. Including the largest earthquake of magnitude 3.5.

Earthquake sequences like these are common and account for roughly 50% of the total seismicity in the Yellowstone region.

Yellowstone earthquake activity in June is at normal background levels.


Ground deformation

Subsidence in north-central Yellowstone continues, although the deformation rates are slowly declining.

Uplift within the Yellowstone Caldera, which began in 2014 after 4 years of subsidence, continues. Since the beginning of 2014, the WLWY GPS station, in the northeastern part of the caldera, has risen about 3 cm.

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