The event lasted about 10 minutes. http://aawu.arh.noaa.gov/. No significant ash emissions have been detected in satellite images; clouds cover much of the island to around 10,000 ft. asl. A larger burst of seismicity occurred at 07:06 AKST (16:06 UTC). AVO is raising the aviation color code to Yellow and the alert level to Advisory. Shishaldin is one of the most active volcanoes in the Aleutian volcanic arc, erupting atleast 28 times since 1775. We will put out more information as it becomes available. detached plume moving ESE from the volcano. Thus, AVO is raising the Aviation Color Code to RED and Alert level to WARNING. Low-level seismic unrest may be continuing undetected. A seismic swarm occurred from July 2016 through the end of 2017. A detached drifting ash cloud to approximately 15,000 ft ASL has been detected at Cleveland Volcano in satellite images from 1402 UTC, Dec 29. southwest of Anchorage. No ash cloud has been detected as of yet in satellite data, but volcanic ash emissions are likely occurring based on infrasound data. Winds are transporting the cloud towards the northwest at an estimated altitude of 23,000 ft asl. The plumes were only visible in single satellite images where they appeared as distinct ash plumes, detached from the summit, extending 45 to 60 miles (75 to 100 km) north of the volcano. NWS reports clouds with radar cloud tops above 20,000 ft above sea level. While seismicity remains variable, it is still within background levels for this volcano. Michelle Coombs, Scientist-in-Charge, USGS, mcoombs@usgs.gov (907) 786-7497. NWS reports a cloud top of 25,000 ft above sea level. AVO will be monitoring Pavlof closely and will release further information as warranted. We are therefore lowering the Aviation Color Code to ORANGE and the Alert Level to WATCH. 36,000 ft asl estimated by satellite and pilot report of cloud to 30,000 ft asl. These were Strombolian eruptions that produced lava fountains and minor emissions of ash and gas from the main intracaldera cone. Seismicity returned to background at 01:45 UTC (17:45 AKDT) indicating an end or pause to the explosion. Mount Pagan is a stratovolcano that is growing within a 6-km-diameter caldera formed less than 9,400 years ago. For the time being, the volcano has returned to normal background levels of activity and AVO is thus lowering the Aviation Color Code and Alert Level to GREEN/NORMAL. It has been 30 days since lava has been active at the surface of Kīlauea Volcano. The Alaska Volcano Observatory is lowering the Aviation Color Code to YELLOW and the Alert Level to Advisory for Mount Redoubt. When lava domes have developed within the summit crater, explosive activity has sometimes followed. Thus, AVO is rasing the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory. No volcanic cloud has been detected in satellite imagery. The eruption of Pavlof Volcano that began on November 12 has intensified and the ash cloud height is currently estimated at 25,000 ft above sea level. AVO is elevating the color code at Kasatochi to YELLOW due to the possibility that these earthquakes may result from magma movement toward the surface. Veniaminof is one of the largest (~300 cubic km; 77 cubic mi) and most active volcanic centers in the Aleutian Arc and has erupted at least 14 times in the past 200 years. This was a brief, short-lived, but explosive ash emission event from Cleveland Volcano and is typical of the type of events observed at this volcano in the past. Thus, AVO is reducing the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY. This event was short lived and similar, if not smaller, than recent explosions at this volcano. Over the past 12 hours earthquake activity in the greater vicinity of Kasatochi volcano has increased rapidly. U.S. Geological Survey 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. Seismicity and subaqueous eruptive activity have declined at Sarigan Volcano prompting reduction of the Aviation Color Code to YELLOW and the Volcanic Activity Level to ADVISORY. The volcano is currently obscured by clouds in satellite images. We have no satellite observations yet, but the infrasound signal suggests an explosive eruption has likely begun. The lack of a real-time seismic network at Cleveland means that AVO is unable to track local earthquake activity related to volcanic unrest. It appears that explosive eruptive activity has waned and AVO is lowering the aviation color code and alert level to ORANGE/WATCH. Zanetti. The Ministry of Civil Defence & Emergency Management, through The National Emergency Management Agency is responsible for providing such alerts to warn about natural hazards. There are no evidence of explosive activity in geophysical data streams or in satellite observations. No activity has been observed at Cleveland following the April 16 explosion. Repeated attempts to remotely repair the radio equipment have failed and the lack of helicopter support in the area makes it impossible to visit the site to affect repairs. However, they do indicate changes in the shallow magma storage system at Mauna Loa. Moderately elevated surface temperatures have been observed with decreasing regularity since then, with the most recent instance occurring on September 30. AVO is increasing the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY. This activity may be due to brittle failure in the surrounding rock caused by magma movement. High winds due to a storm in the area are hindering our ability to detect the eruption in seismic data. Strong seismic activity at Bogoslof this morning from about 16:24 to 17:32 UTC (07:24 to 08:32 AKST) was detected on stations from nearby islands. A subsequent pilot report from 0150 UTC indicated that activity had decreased. A steep-sided lava dome, emplaced during an eruption in 1974, occupies the center of the crater. No eruptive activity or emissions from the summit have been observed since minor steam emissions in late February. AVO is raising the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY. An explosive event beginning at roughly 08:34 AKDT has produced an eruption cloud to at least 30,000 ft. above sea level. Elevated surface temperatures observed in satellite images of Veniaminof Volcano this morning at 13:25 UTC (05:25 AKDT) indicate an eruption at the intracaldera cone is likely underway. Dutton is a snow- and ice-covered stratovlocano which rises to an elevation of 4833 feet. Therefore, AVO is lowering the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY. It is located about about 75 km (45 mi.) Its USGS Volcano Alert level is at WATCH. Pavlof Volcano began erupting abruptly this afternoon, sending an ash cloud to 20,000 ft ASL as reported by a pilot. The activity was recorded on infrasound arrays located in Akutan, 90 mi (145 km) to the southwest, and Dillingham, 363 mi (585 km) to the northeast. Report for Merapi BPPTKG reported that during 25-31 December rock avalanches traveled as far as 1.5 km down Merapi’s NW flank in the Senowo drainage. AVO has detected an increase in seismic activity and infrasound consistent with an explosive eruption at Bogoslof volcano beginning at 12:05 UTC (04:05 AKDT) August 30 and continuing. Due to the decrease in activity, AVO is lowering the color code/activity level to YELLOW/ADVISORY. More details will be provided as they become available. Regional infrasound sensors recorded a small explosion today at about 06:32 UTC (10:32 AKST). Cleveland Volcano is has been lowered to aviation color code YELLOW and alert level ADVISORY. Thus AVO is lowering the Aviation color code and Volcano Alert Level to YELLOW/ADVISORY. Ash trajectory models indicate that a possible trace ash fall could occur on Unalaska, but unlikely to affect Dutch Harbor. No additional eruptive activity has been observed at Cleveland since the brief eruption at approximately 2330 AKDT October 2 (0730 UTC October 3). Such observations in the past have many times, but not always, preceded eruptive activity that has sent ash to altitudes of more than 20,000 ft above sea level and in 2001 as high as 39,000 ft. Eruptions in July 2008 produced ash plumes exceeding 25,000 ft. Cleveland volcano is not seismically monitored; satellite images and pilot reports are the primary source of information. A new VAN will be issued if conditions change significantly or alert levels are modified. Heavily ice-mantled Redoubt volcano is located on the western side of Cook Inlet, 170 km (106 mi) southwest of Anchorage and 82 km (51 mi) west of Kenai, within Lake Clark National Park. Low-level ash emissions have been observed in web camera images and have been confirmed by observers in Perryville. Winds are towards the east-southeast. A SIGMET and Ash Advisory have been issued. Thermal anomalies observed in satellite data over the past few days suggest that Cleveland Volcano has entered another period of volcanic unrest. Seismicity is currently low. Matt Haney, Acting Scientist-in-Charge, USGS, A new VAN will be issued if conditions change significantly or alert levels are modified. As of today, HVO will discontinue daily Kīlauea updates and will issue weekly updates on Tuesdays until further notice. We cannot locate precisely the source of the activity and it is possible that the vent is one of the other volcanic seamounts in the area. The summit lava dome extruded in late January 2013 has remained unchanged since the last color code change on February 6, 2013. Lightning and seismicity increase indicate a significant explosive eruption began at 08:24 AKST (17:24 UTC). On the basis of this information, the Aviation Color Code is lowered to ORANGE and the Alert Level to WATCH. Pavlof Volcano has entered a new phase of eruptive activity. Since that time, no changes have been observed in satellite data, and no explosions have been detected from the Adak Island infrasound array. AVO is monitoring the volcano closely and will provide additional information if and when it becomes available. Steaming from the summit crater has also been observed. Satellite images from earlier tonight show elevated surface temperatures near the volcano's summit. The ash cloud that was likely generated during this explosion has probably dissipated at this time and was likely not above 20,000 feet above sea level. AVO has received no reports of activity or ash emissions since elevated surface temperatures were first observed around the 24th of January. Regional winds are from the west-southwest. Status of the ash cloud forecast can be found at their website at http://aawu.arh.noaa.gov/. The eruption today around 14:09 AKST (23:09 UTC), first detected by lightning, has produced a volcanic cloud seen in satellite images moving north of Bogoslof and reaching as high as 30,000 ft asl. The eruption produced a volcanic cloud moving northeast with an estimated altitude of 25,000 ft asl by satellite data, and a pilot reported a visible cloud at 22,000 ft asl. AVO monitors Cleveland Volcano with satellite imagery as weather allows. Recent satellite images show a plume extending over 80 km east of the volcano. Previous historical eruptions have produced ash plumes that reached 20,000 ft above sea level (1939 and 1956) and ash fallout that blanketed areas within about 40 km (25 mi) of the volcano (1939). The cloud is drifting to the southeast of the volcano. Redoubt began at approximately 22:38 AKDT, March 22, 2009 (0638 UTC). The Alaska Volcano Observatory is raising the Aviation Color Code for Shishaldin Volcano to ORANGE and the Alert Level to WATCH. Redoubt is a stratovolcano which rises to 10,197 feet above sea level. The last signal from the Ahyi area received on distant seismometers was recorded on May 17. Ash eruption at Shishaldin continues and has intensified as shown in satellite and lightning data. No ash cloud has been detected as of yet in satellite data, but volcanic ash emissions likely occurred based on seismic and infrasound data. Elevated surface temperatures have been detected in satellite images at the summit of Cleveland for the past week, and an image from June 14 shows very light ash cover on the volcano's upper flanks. The apparent waning of this activity over the past two months prompts AVO to reduce the Aviation Color Code to GREEN and the Volcano Alert Level to NORMAL. Activity transitioned to continuous seismic tremor at about 12:16 UTC and is ongoing. A pilot report, web camera image, and infrasound data indicate an ash producing explosion occurred at Cleveland Volcano today around 22:05 UTC (14:05 AKDT). Based on seismic levels remaining low since the eruption, and no observations or reports of continued eruptive activity, AVO is reducing the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY. Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal background levels of activity. The ongoing episode of activity is some of the strongest unrest detected so far during the eruption at the intracaldera cone of the volcano that began in early June. An increase in earthquake activity from Bogoslof was detected from stations on nearby islands starting April 15 around 15:01 AKST / 23:01 UTC. west of the community of Nikolski, and 1500 km (940 mi.) It is located in the northern portion of the vent lagoon, has breached sea level, and is about 110 m across. There has been no sign of eruptive activity at Cleveland volcano since a short-lived explosion on the evening (local time) of June 1, 2020. Chris Waythomas, Acting Scientist-in-Charge, USGS. In response, AVO is raising the Aviation Color Code to Orange and the Alert Level to Watch. The height of the eruption cloud is estimated to be 50,000 ft above sea level. U.S. Geological Survey We are evaluating the cloud height as new data comes in and will update if needed. 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