An increase in earthquake activity from Bogoslof was detected from stations on nearby islands starting April 15 around 15:01 AKST / 23:01 UTC. No activity has been observed in satellite data since August 12. The last signal from the Ahyi area received on distant seismometers was recorded on May 17. HAWAIIAN VOLCANO OBSERVATORY MONTHLY UPDATE U.S. Geological Survey Thursday, March 4, 2021, 10:20 AM HST (Thursday, March 4, 2021, 20:20 UTC). KVERT reported that the Strombolian eruption from vents on Klyuchevskoy’s lower NW flank continued during 5-12 March. Winds are to the southeast and no ashfall is expected on communities. Volcano updates, information, and more from the USGS. Therefore AVO is lowering the Aviation Color Code to GREEN and the Volcano Alert Level to NORMAL. Several short bursts of activity have been detected in seismic data beginning at 5:20 and at 6:08 UTC. AVO is downgrading the Level of Concern Color Code for Cleveland Volcano to UNASSIGNED and the Alert Code to UNASSIGNED. Each volcano report includes a link from the volcano's name back to the more complete information in the Weekly Volcanic Activity Report on the Smithsonian website. PVMBG reported that the Strombolian eruption at Lewotolok continued during 10-16 March. Earthquake activity at Great Sitkin Volcano has declined over the past two months to near background levels. To obtain information about the cited articles that are no longer available on the Internet contact the source. Elevated seismicity that began yesterday has increased overnight. Most of Shishaldin's eruptions have consisted of small ash and steam plumes, although the most recent eruption in April-May 1999 produced an ash column that reached a height of 45,000 ft above sea level. west of the community of Nikolski, and 1500 km (940 mi.) A new, 200-300 m-high (660-980 ft) tephra cone developed inside the caldera at the primary eruption site. This may be revised as new information becomes available. However, they do indicate changes in the shallow magma storage system at Mauna Loa. Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal background levels of activity. High winds in the region are being seen on seismic and infrasound stations making it difficult to detect smaller signals from Bogoslof. No ash cloud has been detected as of yet in satellite data, but volcanic ash emissions likely occurred based on seismic and infrasound data. The pulses continue to be identified on seismometers on Makushin Volcano on Unalaska Island. Alert levels are assigned on the basis of review and interpretation of this data. The most recent known ash emission, which rose to 1.5 km above sea level and produced minor local ash fall, occurred on 11 August 2010. No new volcanic emissions have been detected from Bogoslof Volcano since the activity that began at 5:20 UTC, January 31 (20:20 AKST, January 30). It is located 65 km (40 mi) northeast of Amchitka Island and 200 km (130 mi) west of Adak. The easternmost vent is currently exhibiting fountains up to approximately 50 m (164 ft) high with minor fountaining on the west side. Remote Semisopochnoi volcano occupies the largest young volcanic island in the western Aleutians. Due to an increase in seismicity above background levels over at least the last 8 hours AVO is raising the Aviation Color Code to YELLOW and Alert Level to ADVISORY at Semisopochnoi. Satellite observations have yielded no evidence for continuing lava effusion and there have been no detections of anomalous seismicity or infrasound from the volcano since a brief explosion on Tuesday evening (May 16) at 19:17 AKDT (03:17 May 17 UTC). No further ash emissions have occurred at Bogoslof Volcano since the three-hour-long eruption on Monday, 7 August that began around 10:00 AKST (18:00 UTC), and seismicity remains low. AVO is lowering the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory. The Shishaldin network has several outages affecting GPS, seismic, and infrasound stations. With over 40 historic eruptions, it is one of the most consistently active volcanoes in the Aleutian arc. Additional ash-producing eruptions could occur at any time, however, with no detectable precursors. Satellite data indicate ash is rising to 20,000 to 22,000 feet. A subsequent pilot report from 01:50 UTC (4:30 pm AKST) indicated that activity had decreased and the cloud was dispersing. Additional ash-producing eruptions could occur at any time, and precursory unrest may be minor or not detectable. The National Weather Service has issued SIGMET to 25,000 ft above sea level (https://www.weather.gov/aawu/). AVO is raising the volcano alert level/aviation color code at Cleveland Volcano from unassigned to ADVISORY/YELLOW based on the presence of thermal anomalies in satellite data yesterday and a possible ash plume this morning. Satellite observations show no evidence for continuing eruptive activity. Some of the largest events, M 4.3-5.4 recorded during 10-12 and 14-15 March, were felt as far as Hvanneyri (97 km NNE of Grindavik), Hvolsvollur (110 km ESE of Grindavik), and Saudakrokur (250 NE of Grindavik). Recent eruptions occurred in 1902, 1966-68, 1989-90, and 2009. As a result, AVO is raising the Aviation Color Code to ORANGE and the Volcano Alert Level to WATCH at Veniaminof volcano. Thus, AVO is raising the Aviation Color Code to RED and Alert level to Warning for Bogoslof volcano. AVO is therefore lowering the aviation color code to GREEN and the Volcano Alert Level to NORMAL. Over the past week, seismicity at the volcano has remained at low levels and shows no indication of activity associated with ash emissions or lava effusion. The volcano's most recent significant eruption began in February, 2001 and it produced 3 explosive events that produced ash clouds as high as 12 km (39,000 ft) above sea level. Seismic tremor continues and is indicative of low-level effusive activity and small explosions. Rapid detection of an ash-producing eruption may be possible using a combination of seismic, infrasound, lightning, and satellite data. Therefore, the Aviation Color Code and Volcano Alert Level for Cleveland is lowered to YELLOW/ADVISORY. Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS). Additional ash-producing eruptions could occur at any time, however, with no detectable precursors. It is located about about 75 km (45 mi.) As of yet there is no lightning activity that it typically observed during significant ash emissions. This activity is accompanied by lightning strikes detected by the World Wide Lightning Detection Network indicating that a significant explosion has occurred. Pavlof is a stratovolcano which rises to an elevation of 8262 feet. Unknown height. In addition, satellite views of the volcano over the same period show a decrease in surface temperatures at the summit. A very weak steam and gas plume was observed during clear periods in satellite imagery this week. A storm moving through the area in August of 2017 damaged a repeater site that telemetered data from these seismic, camera, and infrasound networks to the CNMI Homeland Security and Emergency Management (HSEM) offices in Saipan. Therefore, AVO is lowering the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY. Source: Japan Meteorological Agency (JMA). No change in seismicity occurred after the explosion, and there have been no infrasound (pressure sensor) signals detected. Thus the USGS cannot say with any certainty that the volcano is at normal or background levels of activity. Mount Dutton is located near the tip of the Alaska Peninsula and lies jointly within the Izembek Wilderness Area and the Alaska Peninsula Wildlife Refuge. Thus, AVO raised the Aviation Color Code to RED and Alert level to WARNING for Bogoslof volcano. Pavlof Volcano began erupting abruptly this afternoon, sending an ash cloud to 20,000 ft ASL as reported by a pilot. Occasional steam plumes and weakly elevated surface temperatures may continue to be seen in satellite and webcam imagery as lava flows cool. We are therefore lowering the Aviation Color Code to ORANGE and the Alert Level to WATCH. A short duration explosive event occurred at Bogoslof volcano at 15:50 UTC on June 5 (7:50 am AKDT) and produced a small volcanic cloud that was observed by a pilot. Therefore AVO is raising the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY. The Alert Level remained at 2 (on a 5-level scale). The summit is currently obscured by cloudy weather in web camera images. The aviation color code and volcano alert level are returned to Green/Normal. These observations represent a departure from normal background activity at Shishaldin, but do not necessarily indicate that an eruption will occur. Seismic activity at Redoubt Volcano has declined over the last 36 hours, although there have been several brief increases in seismicity associated with minor low-level ash emissions. At 1411 on 12 March a short-lived (2.5 minutes) burst of steam-rich gas from Main Crater generated white plumes that rose 400-500 m. Diffuse steam plumes rose 50 m above fumarolic vents on the inner N and E walls during the rest of the day. The altitude of the meteorological cloud deck is variable from about 10,000 ft to 12,000 ft. Additional ash-producing eruptions may occur at any time with limited precursory unrest and little warning. Lower level winds are currently to the northwest, and higher level winds to the southeast, over southern Unalaska Island. The National Weather Service Alaska Aviation Weather Unit has issued an eruption SIGMET warning for aviation up to 25,000 ft above sea level. This is typical of Cleveland volcano and indicates that low-level unrest continues. Lava continued to effuse under the intra-caldera glacier in an area on the flank about 1 km E of the cone’s summit. Due to this decrease in activity, the Alaska Volcano Observatory is decreasing the Aviation Color Code for Shishaldin Volcano to YELLOW and the Alert Level to ADVISORY. An eruption began at Bogoslof volcano today at about 14:16 AKDT (22:16 UTC May 28) and is continuing based on seismic data. There have been no changes in activity at the volcano. Based on low seismic levels 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. This event was short lived and similar, if not smaller, than recent explosions at this volcano. The event was well constrained (+/- 15 km) at a location near the southern base of Ahyi; the summit of the seamount lies within the location uncertainty. Recent observations of Cleveland Volcano suggest that unrest has declined and it is unlikely that eruptive activity is continuing. No ash cloud was detected in satellite imagery, likely because it was too small or below our detection limits. Over the past three months the earthquake rate at Iliamna Volcano has steadily increased and now exceeds normal background levels. Thus, AVO is raising the Aviation Color Code to RED and Alert level to WARNING. 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. Seismicity has persisted above background levels since that time, but had decreased to very low levels before a satellite link for transmitting seismic data failed on November 11, 2020. Rapidly developing events lead to coverage that is often fragmentary. Although seismic activity remains above background, it does not appear to be increasing towards an eruption in the short-term. New deposits of ash and ballistics darkened the summit area, indicating the activity was energetic enough to eject material from a depth of several hundred meters (~600 ft) within the summit crater. The intense seismic activity associated with the Kasatochi eruption has declined and is no longer detected on the AVO seismic network on nearby Great Sitkin Island (about 40 km (25 mi) to the east). The summit crater widened and the lake vanished during the explosions; water is now re-filling the summit crater producing a brownish-green, warm, and probably acidic lake. 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). Thus, AVO is increasing the Aviation Color Code to ORANGE and the Volcano Alert Level to WATCH. AVO is monitoring this situation closely and has its operations room staffed 24 hours per day. As a result, AVO is unable to assess seismic activity at this volcano. Steaming from the summit crater has also been observed. An explosive eruption occurred at Bogoslof this morning at about 09:30 AKST (18:30 UTC). Veniaminof is one of the largest (~ 300 km3) and most active volcanic centers in the Aleutian Arc and has erupted at least 13 times in the past 200 years. AVO detected an explosion at Cleveland Volcano in both infrasound (air pressure) and seismic data today (10/24/2016) at 13:10 AKDT (21:10 UTC). Satellite data over the past week and regional seismic and infrasound data show no evidence of eruptive activity. Ash height reported up to 9000 ft above sea level. Recent satellite images have been obscured by clouds. BPPTKG reported that the 2021 lava dome just below Merapi’s SW rim and the lava dome in the summit crater both continued to grow during 5-11 March. Because this uptick in seismicity increases the likelihood of future explosive activity, AVO is raising the Aviation Color Code for Bogoslof to ORANGE and the Volcano Alert Level to WATCH. - Observers have reported a significant change in volcanic activity. The Alert Level remained at 3 (on a scale of 1-4) and the public was warned to stay 4 km away from the summer crater. The National Weather Service Alaska Aviation Weather Unit has issued an eruption SIGMET warning for aviation. This change is based on increased seismic activity over the past few weeks, accompanied by elevated surface temperatures at the summit in satellite data. A US Fish and Wildlife Service field crew on Kasatochi Island has reported continual small tremors over the past several days. The ash cloud from the eruption has been observed to 35,000 feet in satellite images and is heading east. Radar showed a cloud top above 20,000 ft above sea level at the time of heightened tremor. Regional winds are from the west-southwest. Over the past two days, the eruptive activity at Pavlof has greatly declined. Bursts of explosive activity that began at 5:20 UTC are continuing and intensifying. A drifting ash cloud extending from the southern Bering Sea into interior Alaska is still present and may pose a hazard to air travel. 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). Airwaves associated with low-level explosive degassing have not been detected in infrasound data since Feb. 7. The Aviation Color Code remains at ORANGE, but we will continue to monitor data closely and provide updates as necessary. 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 Recent work and news As was the case in … Satellite data show a discrete, short-lived explosion just prior to 0100 UTC that detached and drifted to the south by 0115 UTC. Over the past month, seismic activity at Okmok volcano has continued to decrease and is now at or very near pre-eruption levels. AVO is lowering the Aviation Color Code to Yellow and the Alert Level to Advisory at Redoubt volcano. Although seismic tremor is currently absent at Semisopochnoi, discrete earthquake activity remains above background levels. Elevated surface temperatures were detected at the summit of Pavlof volcano in satellite imagery this morning suggesting that the volcano is experiencing a low-level eruption with lava at the surface. Recent eruptions occurred in 1902, 1966-68, and 1989-90. AVO reported that the eruption at Veniaminof continued during 9-16 March. Because of evidence for continued low-level ash emissions, the Alaska Volcano Observatory is increasing the Aviation Color Code to ORANGE and the Volcano Alert Level to WATCH. and drifted NW and WNW. The level of unrest at Pavlof has gradually decreased to background levels over the past several months. Visual, satellite, and seismic observations indicate that a lava dome is again forming in the summit crater. west of the community of Nikolski, and 1500 km (940 mi.) Shishaldin remains at Aviation Color Code ORANGE and Alert Level WATCH. The Alaska Volcano Observatory is lowering the Aviation Color Code to. The cloud is drifting to the southeast of the volcano. While a VAN is in effect, regularly scheduled updates are posted at http://www.avo.alaska.edu. Overnight, ash emissions from Veniaminof increased significantly, generating a plume up to 15,000 ft asl and extending for more than 150 miles to the SE. Seismic activity has increased at Pavlof over the past 24 hours and is characterized by ongoing tremor. At 9:30 p.m. HST on December 20, the USGS Hawaiian Volcano Observatory (HVO) detected glow within Halemaʻumaʻu crater at the summit of Kīlauea Volcano, indicating that an eruption had commenced within Kīlauea’s summit caldera. Consequently, the Aviation Color Code is being reduced to Yellow and the Volcano Alert Level to Advisory. No further ash emissions have occurred at Bogoslof Volcano since the explosion on Saturday 18 February at 4:50 AKST (13:50 UTC) and seismicity remains low. Precursory activity prior to eruptions of Pavlof are always very subtle, thus, on the basis of these observations we are increasing the Aviation Color Code to Yellow and the Alert Level to Advisory. No new explosive activity has been observed at the volcano since yesterday morning. Seismic activity at Great Sitkin Volcano has decreased to background levels over the past few weeks. The duration of the event was less than 10 minutes, and seismicity returned to low levels following the explosion. The Alaska Volcano Observatory is raising the Aviation Color Code to ORANGE and Alert Level to WATCH at Shishaldin Volcano. Okmok volcano was in vigorous eruption from July 12 through mid-August, 2008. Because the event was brief and the ash plume was relatively low level and dispersed rapidly AVO is not raising the color code or alert level. AVO is reducing the Aviation Color code to ORANGE and the Alert Level to WATCH. The Aviation Color Code remains at ORANGE and the Volcano Alert Level remains at WATCH at present. Ash fall is possible in nearby communities. The plume was similar in character to those observed the previous week. Redoubt continues. Mt. These observations represent a return to normal background activity at Shishaldin. The explosive eruption that started today, May 16, around 22:32 AKST (May 17 06:32 UTC) is continuing. AVO has received no additional information about activity at Cleveland. Volcanoes are also included in the "New Activity/Unrest" section if the volcano is undergoing a period of relatively high unrest, or increasing unrest. Mixture of steam and ash. In response to this activity, AVO is raising the Aviation Color Code YELLOW and Alert Level to ADVISORY. Seismicity at Great Sitkin has been steadily decreasing for the past several months and is now at background levels. AVO is thus lowering the Aviation Color Code and Alert Level to GREEN/NORMAL. A robust steam plume is visible in satellite data, and at 2250 UTC (14:50 AKDT) extended for 75 km to the south over the western end of Unalaska Island at an estimated altitude of less than 10,000 ft asl. Seismic tremor has increased over the past several hours and remains elevated. No lightning has been detected. Activity is continuing this morning. We are therefore lowering the Aviation Color Code to ORANGE and the Alert Level to WATCH. Download Smithsonian / USGS Weekly Volcanic Activity Report Network Link. A small explosion occurred at Redoubt volcano at 05:12 AKDT (1312 UTC). A NOAA research vessel in the vicinity of Pagan Volcano has reported night time observations of incandescence at the summit of the volcano. Earthquake activity at Great Sitkin Volcano has been elevated over the past five days, and earlier today at 11:39 AKDT (19:39 UTC), a signal that may represent a short-lived steam explosion was detected by seismic data. AVO is therefore downgrading the status of Shishaldin Volcano from aviation color code YELLOW to GREEN and from volcano alert level ADVISORY to NORMAL. Local observers have not noted plumes or ash fall from the volcano, though visibility is often limited. Activity is continuing this morning. Seismic and infrasound signals indicate that this event was very similar to the event from earlier today at 14:30 UTC. Ash emissions beyond the immediate summit crater are more likely while seismic activity is increased. AVO will continue to monitor Shishaldin with satellite, seismic and infrasound (pressure sensor) data. southwest of Anchorage. A small eruption at Cleveland volcano occurred today and AVO is raising the Aviation Color Code to Orange and the Alert Level to Watch. An ash plume was apparent in images obtained at 1645 UTC, 1809 UTC, 1812 UTC, and 1823 UTC. A USF&WS vessel in the vicinity reported vigorous steaming and a "white plume" rising several thousand feet above sea level. 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