Current Alerts for U.S. Volcanoes

  • 2015-05-04 08:47:16 Kilauea Watch Orange
  • 2015-05-04 13:13:24 Shishaldin Watch Orange
  • 2015-05-04 13:13:24 Cleveland Advisory Yellow
  • 2015-05-01 09:55:14 Pagan Advisory Yellow
  • 2015-05-04 13:13:24 Semisopochnoi Advisory Yellow
  • 2015-05-01 08:54:12 Cascade Range Normal Green
  • 2015-04-06 15:36:08 Haleakala Normal Green
  • 2015-04-06 15:36:08 Hualalai Normal Green
  • 2015-04-06 15:36:08 Mauna Kea Normal Green
  • 2015-04-06 15:36:08 Mauna Loa Normal Green
  • 2015-05-01 11:34:05 Yellowstone Normal Green
  • 2015-04-06 15:36:08 Lo`ihi Unassigned Unassigned

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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
Monday, May 4, 2015 1:13 PM PDT (Monday, May 4, 2015 20:13 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 activity continues. Weakly elevated surface temperatures in the summit crater of Shishaldin were observed in one satellite image of Shishaldin today. Seismic activity remains above background levels.

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

No activity was observed in cloudy satellite and web camera images of Cleveland today. No significant activity was detected in seismic or infrasound (air pressure) 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

No activity was observed in cloudy satellite views of Semispoochnoi today. Seismic activity remains above background levels.

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

Pavel Izbekov, Acting Coordinating Scientist, UAFGI
pavel@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, May 1, 2015 8:54 AM PDT (Friday, May 1, 2015 15:54 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 background levels of 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. Additionally, GPS data from most of the major volcanoes, and sparse real-time hydrologic and geochemical monitoring, show no anomalous activity.

Recent Observations: Activity at Cascade volcanoes in Washington and Oregon remained at background levels this week.

The USGS-Cascades Volcano Observatory located at 1300 SE Cardinal Court in Vancouver, WA opens its doors to the public on Saturday, May 2, for a free one-day open house. Scientists will be on-hand from 10:00 am to 5:00 pm to share the results of their research and talk about volcano hazards. Hands-on activities and equipment demonstrations will be featured.





Mount St. Helens Seismic Information
CVO Alert Archive Search
HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Monday, May 4, 2015 8:47 AM HST (Monday, May 4, 2015 18:47 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: There was slight inflation at the summit of Kīlauea Volcano over the past day. The summit lava lake remains close to the rim of the Overlook crater but did not spill onto the floor of Halemaʻumaʻu Crater over the past day. Seismicity beneath the summit and upper East and Southwest Rift Zones is elevated, and included a magnitude 3.6 earthquake in the upper East Rift Zone this morning at 4:42 am. At the East Rift Zone eruption site, widespread breakouts are active within about 8 km (5 mi) of Puʻu ʻŌʻō.

Summit Observations: There was slight inflationary tilt at Kīlauea's summit over the past day. The lava lake level has been at, or near, the rim of the Overlook crater over the past day, but the lake did not overflow onto the floor of Halemaʻumaʻu Crater over the past day. Yesterday afternoon the lava lake level was measured at roughly 3 meters (yards) above the original (pre-overflow) floor of Halemaʻumaʻu Crater. The recent overflows have accumulated and built the rim of the Overlook crater up several meters (yards) above the original floor of Halemaʻumaʻu Crater. Yesterday afternoon at 1:20 pm a collapse of a portion of the wall of Halemaʻumaʻu Crater impacted the lake and triggered a small explosive event, which deposited fist-size clasts around the rim of Halemaʻumaʻu Crater. This morning, the lava level is close to the rim of the Overlook crater. Seismicity is elevated beneath Kīlauea's summit and upper East and Southwest Rift Zones. A magnitude 3.6 earthquake in the upper East Rift Zone occurred this morning at 4:42 am and was widely felt in the Volcano Village area. Sulfur dioxide emission rates averaged 4400-5400 tonnes/day for the week ending April 28.

Puʻu ʻŌʻō Observations: The tiltmeter on the north flank of Puʻu ʻŌʻō recorded inflationary tilt over the past day. Otherwise, there were no noticeable changes at Puʻu ʻŌʻō. The sulfur dioxide emission rate from all East Rift Zone vents was about 700 tonnes/day when last measured on April 28, 2015.

June 27th Lava Flow Observations: Webcam views of nighttime incandescence and daytime smoke indicate that surface flows remain active northeast of Puʻu ʻŌʻō. The most distant activity was burning forest about 8 km (5 mi) northeast of the crater when mapped on April 23.



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 0 m to more than 200 m (660 ft; 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, but starting on April 21, began rising and reached to the Overlook Crater rim. 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. An eruption on the northeast flank of Puʻu ʻŌʻō on June 27, 2014, sent a lava flow to the northeast, where it eventually intersected and utilized old grounds cracks for part of its length. The flow exited the ground cracks in early September 2014 and approached the outskirts of the town of Pāhoa, where it persisted until early March 2015. Since then, widespread breakouts have been active northeast of Puʻu ʻŌʻō, well upslope from any infrastructure.

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:
Puʻu ʻŌʻō Cone and Halemaʻumaʻu 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.

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."

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, May 1, 2015 9:46 AM PDT (Friday, May 1, 2015 16:46 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 April 1, 2015 (0000h PST) through April 30, 2015 (2359h PDT):
Mt Shasta: One M1 or greater earthquake was detected (M2.07).
Medicine Lake: No earthquakes of M1.0 or greater were detected.
Lassen Volcanic Center: Two earthquakes of M1.0 or greater were detected. The largest registered M2.22.
Clear Lake Volcanic Field: One earthquake of M1.0 or greater was detected, of M1.42. [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 M3.28].
Long Valley Volcanic Region: In Long Valley Caldera, 7 earthquakes of M1.0 or greater were detected. The largest event registered M1.86. In the Mono Craters region, ten earthquakes of M1.0 or greater were detected (M2.48 maximum), and two earthquakes of M1.0 or greater were detected under Mammoth Mountain (M1.77 maximum). [Note: The typical high level of seismicity was observed south of the caldera in the Sierra Nevada range. The largest registered M2.91].
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 M2.53.
Coso Volcanic Field: The typical high level of seismicity was observed, with 29 earthquakes M1.0 or greater. The largest registered M2.34.

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, May 1, 2015 9:55 AM PDT (Friday, May 1, 2015 16:55 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. Satellite viewing conditions at Pagan were partly cloudy over the past week. Steam and gas emissions, if they are occurring, are not distinguishable from the meteorological clouds.

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 Islands volcanoes show no signs of significant unrest.
Equipment failure on April 3, 2015 resulted in the loss of seismic data from all but one seismic station on Anatahan.
USGS conducts daily checks of earthquake activity at 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
Friday, May 1, 2015 11:34 AM MDT (Friday, May 1, 2015 17:34 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 April 2015, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 62 earthquakes were located in the Yellowstone National Park (YNP) region. The largest event was a small earthquake of magnitude 2.2 on April 26, at 10:03 PM MDT, located about 5 miles northeast of Lake, WY.

No earthquake swarm activity was present during April.

Yellowstone earthquake activity in April remains at low background levels.

Ground deformation


GPS stations in the caldera (and north of the caldera) exhibit minimal movement either up or down at this time. 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