Elevated surface temperatures were identified in satellite images on 7 March and seismicity slightly increased on 8 March. On 12 February, the Volcanic Alert Level was lowered back to Advisory and the Aviation Color Code was lowered to Yellow. Cleveland lacks a real-time seismic network. | September AVO reported that no unusual seismicity was detected at Cleveland during 12-18 August. Satellite images acquired during the night of 23 December 2008 showed a persistent thermal anomaly near the summit of Cleveland, a stratovolcano forming the western half of the remote and uninhabited Chuginadak Island in the E-central Aleutian Islands. Cleveland remained at Concern Color Code Yellow. The new dome was first visible in images on 15 April, with the presence of a small (less than 10 m diameter) mound deep in the crater. Low pulses of volcanic tremor continued to be detected by an AVO seismic network 230 km to the E of the volcano. AVO reported that an astronaut aboard the International Space Station observed an ash plume from Cleveland at 1500. AVO raised the Volcano Alert Level to Watch and the Aviation Color Code to Orange. As stated in those previous issues, thermal anomalies were common in satellite data as reported by the Alaskan Volcano Observatory (AVO). Dome growth and destruction characterized activity at Cleveland during 2011-2014. The ash cloud produced from the 19 February eruption of Cleveland volcano was visible on GOES-10 imagery through 1700 on 21 February. Energetic steaming and highly elevated surface temperatures in the summit crater were observed in satellite data on 15 May. | July Satellite observations were obscured by clouds during 8-10 April. | June Mount Cleveland on May 15, 2020. | October A small explosion was detected on 17 August by seismic and infrasound instruments on neighboring volcanoes. Cleveland, after detecting a hot spot that morning at 52.78°N, 169.93°W through remote sensing. The number of thermal anomalies decreased the next month, occurring on 10, 21, and 25 September. On 3 February AVO reported that recent satellite data indicated that a new lava dome had been extruded, and partially filled Cleveland's summit crater. Weak thermal activity was observed by satellite imagery throughout the month. The events were consistent with lava-dome growth, but growth could not be visually confirmed. No additional significant activity led AVO to the lower the levels back to Yellow/Advisory on 6 May. No evidence of an ash cloud was visible in satellite images following the event. The Alaska Volcano Observatory has raised the alert level for Mount Cleveland, a 1730 m stratovolcano (cone-shaped volcano made up of layers of ash and lava), located on Chuginadak Island, roughly 500 km southeast of Anchorage in the Aleutian Island Chain, following an eruption on Monday 1 June 2020. Neither eruptive activity nor thermal anomalies have been observed at Cleveland during the previous 6 weeks. Most of these events did not have an accompanying ash signal in AVHRR satellite images, suggesting minor to no ash emissions. 2016: April The lava dome that formed during the past fall and winter was removed by explosive activity on 25 and 29 December 2011. A weak thermal anomaly detected on 2 June suggested continuing low-level ash emission. Source: US Geological Survey Alaska Volcano Observatory (AVO), Explosion on 1 June 2020 produced an ash plume and destroyed the January 2019 lava dome. Niveau d’alerte volcanique actuel: NON ASSIGNÉ Niveau d’alerte volcan précédent: AVIS. No current seismic information was available because Cleveland does not have a real-time seismic network. Two small explosions were also detected by the sensors on 14 and 16 November. Three small SO2 clouds produced by small explosions on 20 July were detected in OMI satellite data provided by the University of Maryland Baltimore County. New Zealand marks one year since volcanic eruption killed 22 In this Dec. 11, 2019, file photo, plumes of steam rise above White Island off the coast of Whakatane, New Zealand, … Clear satellite views revealed vigorous steam plumes during 10-11 May and thermal anomalies during 10-14 May. Dome was gone by 11 March 2012. The growth and explosive destruction of six lava domes at Cleveland were recorded between June 2014 and February 2017. According to David Schneider of AVO, the MODVOLC algorithm has a higher trigger threshold than an analyst and MODVOLC also has fewer observations each day since it only uses MODIS satellite data. Dome persisted through September 2013. Cleveland from the ground at Nikolski, Umnak Island (about 65 km ENE of the volcano). Four thermal anomalies were detected on 3, 6, and 8-9 November. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales. A gas-and-steam plume was observed on 9 May. Slightly elevated surface temperatures were identified in satellite images a few times during 26-30 January. Minor ash deposits on the flanks were observed on 14 June 2015 in addition to stronger elevated surface temperatures, suggesting a new dome growth episode. “Cluster of Alaskan Islands Could be Single, Interconnected Giant Volcano,” reads the headline. Cleveland reported activity, including all types of volcanic activity. The plume had definite dark streaks and swirls of ash. Cloud cover obscured observations by satellite. Deux explosions modérées ont également été détectées hier à 23h00 et 23h02. The event was interpreted as a short-lived ash emission without signs of further activity. Observations showed that a small lava dome, 25 m across, had recently been emplaced. Send us an email. Minor ash-and-gas emissions were also observed. But these are nothing compared to caldera-forming eruptions. . The deposits were mainly confined to drainages; deposits extended >1.5 km in length. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. No new ash emissions or thermal anomalies have been detected in clear to partly cloudy satellite views from the morning of 8 February. Seismicity remained low. Volcano seismicity was absent because Cleveland lacks a real-time seismic network. These anomalies suggested that lava-dome growth was continuing, although no activity was observed in partly cloudy satellite images during 12-17 September. Satellite image analysis revealed that a small lava flow had breached the SE rim of the summit crater and traveled as far as1.5 km down the flank. The MODIS measurements shown in table 2 for 24 July indicated several thermal anomalies to the W of the cone and pixels that are displaced downslope, E of the cone, several almost reaching the ocean. AVO issued a new VONA (Volcano Observatory Notice for Aviation) on 17 June 2015 returning the Aviation Color Code to Yellow (Yellow is 2nd lowest on a 4-color scale), and the Volcano Alert Level to Advisory (also 2nd lowest on a 4-level scale). A string of volcanoes in the Aleutian Islands might actually be one mega volcano, scientists say. The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange. On 7 October, AVO raised the Concern Color Code to Orange after detecting a small drifting volcanic ash cloud. The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange. The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange. Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. The Volcanic Alert Level remained at Advisory and the Aviation Color Code remained at Yellow. Overcast skies prevented observations. One or two ash plumes may have also been emitted. AVO reported that during 13-19 September nothing significant was observed in often cloudy satellite images and web camera views of Cleveland; elevated surface temperatures were identified in satellite images during 13-15 September and minor steaming was noted during 17-19 September. Dates of significant eruptions as reported by the AVO web site for Cleveland from January 2001 through January 2012, and related BGVN reports covering the respective eruptions. Mount Cleveland, the most active volcano in North America over the past 20 years, is one of the islands that could be part of the interconnected caldera. A weak thermal anomaly was detected in satellite imagery on 3 March. The Aviation Color Code was lowered from Orange to Yellow by AVO on 3 June when no other signs of eruptive activity were observed. Field crews conducted an overflight during the last week of July and observed incandescence from a vent in the summit crater. A strong thermal anomaly interpreted as a possible lava flow was also present in the imagery. AVO reported that small explosions at Cleveland on 28 and 30 October partly destroyed the lava dome within the summit crater. Subsequent analysis of the images concluded the plumes rose no more than 4.6 km altitude. Two weaker explosions were subsequently detected in infrasound and seismic data on 28 September (0516 and 0558 AKDT, 1319 and 1358 UTC), although no visible ash clouds were associated with these events. On 31 March 2011 the Alaska Volcano Observatory (AVO) lowered the Volcano Alert Level and the Aviation Color Code for Cleveland to Unassigned, noting that no eruptive activity had been confirmed during the previous few months (BGVN 36:05). Activity during October 2016-February 2017. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. Elevated surface temperatures were sporadically observed in early September. Local time: December 16, 2020 1040 AKST (December 16, 2020 1940 UTC) CLEVELAND LINKS. AVO reported weakly-to-moderately-elevated surface temperatures reappearing during the second and third weeks of July. AVO also stated, in an earlier report, that low-level ash emissions at Cleveland occur frequently and also do not necessarily mean that a larger eruption is imminent. Cleveland volcano (Aleutian Islands, Alaska): AVO weekly update . This thermal anomaly again suggested the presence of an active lava flow. On 30 May AVO reported that no explosions or renewed lava-dome growth had been detected at Cleveland since 9 May. During 17-18 September a thermal anomaly was detected in satellite images. Activity during June 2014-February 2015. Moderately-elevated surface temperatures appeared in satellite data on 31 January. Le dôme de lave est actuellement dans un état stable. AVO reported that during 8-14 February there were no observations of elevated surface temperatures or ash emissions from Cleveland because of partly cloudy conditions. Since 24 May 2006, no new information about ash emissions had been received, nor have indications of continuing activity been detected from satellite data for the volcano. The plume was seen from an airplane on 1 August. T. Madsen and John Reeder flew within 40 km of Mt. It is a stratovolcano that comprises the entire western half of Chuginadak Island. Activity during January-April 2017. Information Contacts: Alaska Volcano Observatory (AVO), a cooperative program of a) U.S. Geological Survey, 4200 University Drive, Anchorage, AK 99508-4667 USA (URL: https://avo.alaska.edu/), b) Geophysical Institute, University of Alaska, PO Box 757320, Fairbanks, AK 99775-7320, USA, and c) Alaska Division of Geological & Geophysical Surveys, 794 University Ave., Suite 200, Fairbanks, AK 99709, USA (URL: http://www.dggs.alaska.gov/); Anchorage Volcanic Ash Advisory Center (VAAC), Alaska Aviation Weather Unit, NWS NOAA US Dept of Commerce, 6930 Sand Lake Road, Anchorage, AK 99502-1845 USA (URL: http://vaac.arh.noaa.gov/); MIROVA (Middle InfraRed Observation of Volcanic Activity), a collaborative project between the Universities of Turin and Florence (Italy) supported by the Centre for Volcanic Risk of the Italian Civil Protection Department (URL: http://www.mirovaweb.it/). Elevated surface temperatures were identified in satellite images during 29 June-2 July; the thermal anomaly extended SW downslope in the crater consistent with a lava flow. Elevated surface temperatures were evident in satellite data on days when the area was cloud-free. 8 tremblements de terre à basse fréquence (LF), On 21 June, AVO observers noted a broad, black swath of material extending from within a few hundred meters of the summit well down the NE flank. 52 ° 49’20 « N 169 ° 56’42 » O, During 16 and 21-23 October satellite data showed moderately elevated surface temperatures and a small steam plume was visible in web camera images. No other activity was detected during 14-19 March. December 18, 2020. These blocks suggested to AVO that minor explosive activity occurred at the summit that was below the detection threshold of the seismic and pressure sensors. 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