Current Alerts for U.S. Volcanoes

  • 2015-08-28 13:41:38 Cleveland Watch Orange
  • 2015-08-28 07:25:19 Kilauea Watch Orange
  • 2015-08-28 13:41:38 Shishaldin Watch Orange
  • 2015-08-28 10:15:53 Pagan Advisory Yellow
  • 2015-08-28 10:03:23 Cascade Range Normal Green
  • 2015-08-04 14:38:16 Haleakala Normal Green
  • 2015-08-04 14:38:16 Hualalai Normal Green
  • 2015-07-28 20:30:09 Iliamna Normal Green
  • 2015-08-28 13:41:38 Katmai Normal Green
  • 2015-08-04 14:38:16 Mauna Kea Normal Green
  • 2015-08-04 14:38:16 Mauna Loa Normal Green
  • 2015-08-03 11:26:57 Yellowstone Normal Green
  • 2015-08-04 14:38:16 Lo`ihi Unassigned Unassigned

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Friday, August 28, 2015 1:41 PM PDT (Friday, August 28, 2015 20:41 UTC)

52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Elevated surface temperatures were observed in satellite views throughout the past week. No activity was observed in web camera images. No unusual volcanic seismicity was detected during the past week.

Cleveland volcano forms the western portion of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. The volcano is located about 75 km (45 mi) west of the community of Nikolski, and 1500 km (940 mi) southwest of Anchorage. The most recent significant period of eruption began in February, 2001 and produced 3 explosive events that generated ash clouds as high as 39,000 ft above sea level. The 2001 eruption also produced a lava flow and hot avalanche that reached the sea. Since then, Cleveland has been intermittently active producing small lava flows, often followed by explosions that generate small ash clouds generally below 20,000 ft above sea level. These explosions also launch debris onto the slopes of the cone producing hot pyroclastic avalanches and lahars that sometimes reach the coastline.

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 within the summit crater of Shishaldin likely continues. The level of seismicity remains above background. Elevated surface temperatures were detected in satellite views of Shishaldin over the past week. No activity was seen in web camera images.

Shishaldin volcano, located near the center of Unimak Island in the eastern Aleutian Islands, is a spectacular symmetric cone with a base diameter of approximately 16 km (10 mi). A 200-m-wide (660 ft) funnel-shaped summit crater typically emits a steam plume and occasional small amounts of ash. Shishaldin is one of the most active volcanoes in the Aleutian volcanic arc, with at least 54 episodes of unrest including over 24 confirmed eruptions since 1775. Most eruptions are relatively small, although the April-May 1999 event generated an ash column that reached 45,000 ft above sea level.

58°16'44" N 154°57'12" W, Summit Elevation 6716 ft (2047 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Strong winds in the Katmai area picked up loose 1912 volcanic ash and carried it east again this week on Friday (08/28/15). AVO detected a cloud of resuspended ash blowing from the vicinity of Katmai and the Valley of Ten Thousand Smokes across and beyond Kodiak Island. The National Weather Service estimated the top of the plume at 6,000 feet (1823 m) above sea level.

This phenomenon is not the result of volcanic activity and occurs seasonally in the spring and fall during times of high winds and dry snow-free conditions in the Katmai area and other young volcanic areas of Alaska. No eruption is in progress. All of the volcanoes of the Katmai area (Snowy, Griggs, Katmai, Novarupta, Trident, Mageik, Martin) remain at color code GREEN.

Resuspended volcanic ash should be considered hazardous and could be damaging to aircraft and health. For more information on volcanic ash and human health, visit the following website:


Other Alaska volcanoes show no signs of significant unrest:

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:





John Power, Scientist-in-Charge, USGS (907) 786-7497

Jessica Larsen, Acting Coordinating Scientist, UAFGI (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
Friday, August 28, 2015 10:03 AM PDT (Friday, August 28, 2015 17:03 UTC)

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: Over the past two weeks, water released from Mount Hood’s White River Glacier has generated sediment-laden streamflow and modest debris flows. The debris flows were detected on several seismometers located near the White River valley.

Such sediment-laden flows are relatively common in the valley after extended periods of hot weather.  This year’s warm temperatures have exposed many areas throughout the Cascades that are typically under snow cover. As a result, periods of increased rainfall in the months ahead may mobilize more sediment off the volcanoes than usual, and muddy streamflows and debris flows may be more frequent.

Fieldwork continues throughout the Cascades; highlights this week include campaign GPS at Mt Baker and gas measurements at Mt Hood.

Mount St. Helens Seismic Information
CVO Alert Archive Search
U.S. Geological Survey
Friday, August 28, 2015 7:25 AM HST (Friday, August 28, 2015 17:25 UTC)

This report on the status of Kilauea volcanic activity was prepared by the USGS Hawaiian Volcano Observatory (HVO). All times are Hawai`i Standard Time.

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: The lava lake at Kīlauea's summit is still active. Summit tiltmeters are recording inflationary tilt. The East Rift Zone lava flow northeast of Puʻu ʻŌʻō is also active, and all breakouts remain within 8 km (5 mi) of the vent. Thursday morning's lava breakout on the north side of Puʻu ʻŌʻō remained active throughout the day and into the evening. Lava continued to flow across the bottom of Puʻu ʻŌʻō crater until about midnight last night. None of the lava flows currently pose a threat to communities but are being monitored closely. Low levels of seismic activity continue across the volcano.

Summit Observations: Kīlauea's summit deflated through the day and early evening yesterday and then switched to inflation overnight. Seismic tremor continues with episodic bursts associated with spattering on the surface of the summit lava lake, which remains active. Yesterday morning, the depth to the surface of the lava lake was about 58 m (190 ft) below the floor of Halemaʻumaʻu. No significant change in lake level occurred overnight. Seismicity within the volcano remains at a low level. Summit sulfur dioxide emission rates ranged from 2,000 to 2,200 metric tons/day for the week ending August 18.

Puʻu ʻŌʻō Observations: Early Thursday morning, lava began to erupt from a vent on the northeast side of the crater floor. Flows within Puʻu ʻŌʻō crater remained active until about midnight last night. Seismic activity remains low. The sulfur dioxide emission rate from all East Rift Zone vents was about 390 tonnes/day when measurements were last possible on August 13, 2015.

June 27th Lava Flow Observations:Webcam views overnight show continued activity on the flow field northeast of Puʻu ʻŌʻō. These flows are active within 8 km (5 mi) of Puʻu ʻŌʻō, and some are marked by smoke plumes where lava is creeping into the forest. The lava breakout on the northeast flank of Puʻu ʻŌʻō that began about 1:00 am on Thursday remained active much of yesterday and into the evening. HVO field crews plan to visit the eruption site today to map the extent of the breakout and make additional measurements.


Daily Activity Summary also available by phone: (808) 967-8862

Subscribe to these messages:

Webcam images:


Lava Flow Maps:

Definitions of terms used in update:

Sulfur dioxide emission rate discussion:


Overview of Kīlauea summit (Halemaʻumaʻu) and East Rift Zone (Puʻu ʻŌʻō) eruptions:

Summary of volcanic hazards from Kīlauea eruptions:

Recent Earthquakes in Hawaii (map and list):

Explanation of Volcano Alert Levels and Aviation Color Codes:

Lava viewing information:
Hawai`i Volcanoes National Park:

HVO Contact:

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
U.S. Geological Survey
Monday, August 3, 2015 2:16 PM PDT (Monday, August 3, 2015 21:16 UTC)

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 July 1, 2015 (0000h PST) through July 31, 2015 (2359h PDT):
Mt Shasta: No M1 or greater earthquakes were detected.
Medicine Lake: Four M1 or greater earthquakes were detected. The largest event was M1.53.
Lassen Volcanic Center: Seventeen earthquakes of M1.0 or greater were detected. The largest registered M2.18. Many of these events occurred during two minor swarms on July 7 and 9, about 12 km northeast of the town of Mill Creek near the Shasta County-Plumas County boarder.
Clear Lake Volcanic Field: One earthquake of M1.0 or greater was detected, of M1.22. [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 M3.83].
Long Valley Volcanic Region: In Long Valley Caldera, 21 earthquakes of M1.0 or greater were detected. The largest event registered M2.77. In the Mono Craters region, 10 earthquakes of M1.0 or greater were detected. The largest event was M2.48. One earthquake of M1.0 or greater was detected under Mammoth Mountain (M1.02). [Note: The typical high level of seismicity was observed south of the caldera in the Sierra Nevada range. The largest event registered M3.01].
Ubehebe Craters: No earthquakes at or above M1.0 were detected.
Salton Buttes: Three earthquakes of M1.0 or greater were detected. The largest registered M2.75.
Coso Volcanic Field: The typical high level of seismicity was observed, with 10 earthquakes M1.0 or greater. The largest registered M1.96.

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

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 For general information on the USGS Volcano Hazard Program Statewide seismic information for California and Nevada can be found at

CalVO Alert Archive Search
Friday, August 28, 2015 10:15 AM PDT (Friday, August 28, 2015 17:15 UTC)

Report prepared by the U.S. Geological Survey.

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.

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:

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


Other Northern Mariana Islands volcanoes show no signs of significant unrest in satellite data.
Equipment failure on April 3, 2015 resulted in the loss of seismic data from all but one seismic station on Anatahan.
Data connections that were down following the recent typhoon activity were restored on August 20,2015. The USGS is now conducting daily seismic checks on data from one seismic station on Anatahan and one seismic station on Sarigan as well as an infrasound array on Sarigan.

For definitions of Aviation Color Codes and Volcano Alert Levels, see:


USGS Northern Mariana Duty Scientist (808) 967-8815

CNMI Homeland Security and Emergency Management Office (670) 664-2216

NMI Alert Archive Search
Monday, August 3, 2015 11:26 AM MDT (Monday, August 3, 2015 17:26 UTC)

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


During July 2015, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 66 earthquakes were located in the Yellowstone National Park (YNP) region. The largest event was a small earthquake of magnitude 2.2 on July 11, at 06:09 PM MDT, located about 13 miles north northwest of Lake, WY.

July seismicity included an earthquake swarm occurring on July 29th, 10 miles south southeast from West Yellowstone, MT, accounting for 14 earthquakes (ranging in magnitude from 0.2 to 1.9). The largest swarm event was a small earthquake of magnitude 1.9 on July 29, at 03:14 AM MDT.

Yellowstone earthquake activity in July remains at low background levels.

Ground deformation

GPS stations in Yellowstone continue to show little or no ground deformation. See for example: (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

Jacob Lowenstern, Scientist-in-Charge

YVO Alert Archive Search