veniaminof volcano altitude

Low-level seismic tremor continued during 21-24 September. reported seeing black clouds ejected from the summit beginning at 1430 on 30 July and continuing into early August. Veniaminof remained at Concern Color Code Yellow. Gradually increasing low-frequency tremor was recorded on two seismograph stations at Veniaminof, along with elevated surface temperatures of the intracaldera cinder cone recorded via satellite images on 7 June 2013. During the afternoon and evening of 25 April, more than 25 small steam-and-ash emissions were seen during an 8-hour period, producing clouds that rose 300-600 m above the active cone. Minor steam and ash emission was again observed on 30 November. Seismicity remained slightly above background levels through the following June, although no further activity was reported. Visual observations indicated typical steaming from the summit caldera cone. during clear conditions on 24 November. Information Contacts: M. E. Yount and T. Miller, USGS, Anchorage; J. Taber, LDGO. A short eruptive pulse was recorded during 1526-1726, and subsequent ash plumes rose to below 3 km with low-altitude ash emissions drifting 100 km S on 22 November (figure 32). Periods of nearly constant seismicity at Veniaminof since 31 December led AVO to raise the Concern Color Code from Green to Yellow on 6 January. Due to the continuing seismicity and reports of unusual steaming, the Concern Color Code remained at Yellow. At 2323 a pilot observed ash at an altitude of 3.7 km (12,000 ft) a.s.l. During the report period, occasional low-level steam plumes were seen on the AVO web camera. On 26 May 2009, AVO reported that seismicity from Veniaminof had decreased during the previous week. The webcam in Perryville, 35 km SE, periodically recorded diffuse ash emissions and incandescence from the cone. U S Geol Surv Open-File Rpt, 98-582: 1-104. During 21-28 January, seismic data, web camera views, and satellite images all indicated that low-level ash emissions at Veniaminof continued. "The most recent eruptive activity at Veniaminof had little associated seismicity as compared to the previous eruption. The plume rose 200 m and trailed SW for up to 40 km. Renewed lava flow activity was observed in early July, from a vent near the summit of the cone, and perhaps from a new vent on its SE flank. The Aviation Color Code/Volcano Alert Level was lowered to Yellow/Advisory. Two new lava flows were also observed issuing from the NE flank of the new cone. Veniaminof remained at Concern Color Code Yellow throughout August 2004. 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 Concern Color Code remained at Yellow. Clear web camera views on 9 March showed small diffuse ash plumes extending a short distance from the intracaldera cone. | November Since early September, no ash emissions were seen on the web camera and no evidence of ash was visible on satellite imagery. It became most vigorous at approximately 1730 ADT (0130 UTC on 19 April) when it rose to ~ 460-610 m above the intracaldera cone (~ 2,590-2,740 m altitude). Low-level activity continued during the week of 28 June, with episodes of low-level tremor and small volcanic earthquakes occurring regularly on 30 June. Pilots reported an ash plume to about 4.5 km altitude at 1045, very little activity at 1100, and another ash plume to about 5.4 km at 1115. The Aviation Color Code remained at Orange (the second highest level on a four-color scale) and the Volcano Alert Level remained at Watch (the second highest level on a four-level scale). Ground observers reported short-lived ash-bursts from the caldera's cone on 18-25 March. 2009: May Vapor clouds; ash plume to 2 km altitude; no glow. During 27-28 November acoustic waves were recorded by regional infrasound sensors. On 7 and 8 July, lava fountaining was continuing and bombs rose to about 100 m above the cone. Witnesses aboard a ferry passing Veniaminof early the next morning noted lava fountaining and an active lava flow. | June On 8 July 2013, AVO reported that nearly continuous, low-level volcanic tremor had occurred during the previous 24 hours. On 24 June satellite images detected elevated surface temperatures and a plume that drifted SW. The eruption has formed an oval-shaped NE-SW lava field about 1,000 m (N-S) x 800 m (E-W) on the SE flank of the main intracaldera cone between ~1,925 and 1,770 m elevation (preliminary measurements are based on guesses as to scale, similarity to 1983-84 features, etc.). During the week of 15 February, AVO received several reports of small ash clouds rising "several hundred feet" above the intracaldera cinder-and-spatter cone of Veniaminof. Mount Veniaminof (Russian: Вулкан Вениаминова) is an active stratovolcano on the Alaska Peninsula. Residents of Perryville reported rumbling noises, explosions, and trace ashfall on 20 August. . Seismicity then declined, and by the 14th was characterized by the occurrence of about one small-amplitude discrete seismic event every 1-2 minutes. They concluded that given the decline in seismicity it appeared that the most recent episode of eruptive activity had ended at Veniaminof. On 26 May, AVO reported that seismicity from Veniaminof had decreased during the previous week. During the week of 11 April, several low-level episodes of volcanic tremor and small volcanic earthquakes were recorded. (Top row) Observed and (bottom row) best-fit synthetic ERS interferograms of Mount Veniaminof. On 25 June the web camera showed a light-colored plume rising from the intracaldera cone to just above the caldera rim. Veniaminof volcano news & activity updates: Veniaminof volcano (Alaska Peninsula, USA) activity update. No additional signs of volcanic activity were visible on satellite imagery during 23-27 February, and there were no more reports of ash-plume sightings from observers. The eruption constructed a new spatter cone within the summit crater of the main active cone. Pilots of aircraft PEN241 saw on 27 August 2013 intermittent ash discharges at 1720 UTC . A new pit (2.0 x 0.75 km) that had formed in the ice adjacent to the cone on the E flank contained lava. On 7 February a small vapor cloud rose from the summit area, and that evening Perryville residents saw a faint glow but no lava fountains. Post-Miocene Volcanoes of the World. were intermittently observed in web-camera images. However, the elevated seismic activity continued to 4 March and low-level steaming was seen on 29 February during a break in the weather. Images also showed that most of the lava flows traveled S of the cone a short distance (hundreds of meters). Minor steam-and-ash plumes were sometimes visible during clear daytime conditions. No thermal anomalies were observed on satellite imagery. | August Weak thermal anomalies and decreased levels of tremor during 14-16 September possibly indicated ongoing but diminished lava effusion. Cloudy conditions obscured views of the volcano in web camera and satellite data. The Anchorage Volcanic Ash Advisory Center (VAAC) reported a steam/ash plume noted on web-cam and satellite on 13 March 2006 at 0500Z (12 March 2006 at 2000 hours local), moving NNW at 9.2 km/hr and falling to the land surface. Information Contacts: M.E. Although seismicity was lower than when first noted in early September, it was still above background levels. Satellite imagery on 22 February (figure 9) again showed very localized deposits within the ice-filled caldera. Visual observations on 22 January from the village of Perryville, located 35 km SSW of the volcano, revealed that white steam was rising from the intracaldera cone. During 27-28 November acoustic waves were recorded by regional infrasound sensors. On 13 June 2013, low-level emissions led the AVO to increase the aviation color code to orange. These probably represent fresh lava erupting from the volcano's active cone. Mount Veniaminof is an ice-clad, basalt-to-dacite stratovolcano topped by an ice-filled caldera 10 km (about 6 mi) in diameter, located 775 km (482 mi) southwest of Anchorage on the Alaska Peninsula. AVO considered the activity at Veniaminof to be minor, but the exact nature of the unrest remained unknown. . Tue, 15 Oct 2013, 13:09. The intensity of tremor and small earthquakes under the volcano had decreased since the 10th, but remained above the background level established during the summer of 2002. 2020: June continued through mid-May with steam plumes and lava emissions. Geology of the Alaska Peninsula-island arc and continental margin (Part 1). Through 26 April, Veniaminof remained at Concern Color Yellow. Elevated surface temperatures were visible in satellite images. Small ash emissions were observed during clear weather on 25 and 28 April rising to ~1 km above the active cone. Veniaminof remained at Concern Color Code Yellow. The elevated seismicity that began in mid-December 2002 at Veniaminof continued during 21-28 March, but declined in comparison to previous weeks. | April Veniaminof, on the Alaska Peninsula, is truncated by a steep-walled, 8 x 11 km, glacier-filled caldera that formed around 3,700 years ago. Elevated thermal anomalies were identified in satellite data overnight, and incandescence was visible from a Perryville webcam, suggesting continuing lava effusion which had been obscured by the increased period of ash emissions. | December Weather clouds obscured the volcano from mid-December through early January. Ash rose a few hundred meters above the cone, drifted E, and dissipated rapidly. Both low-level tremor and intermittent bursts of tremor continued at Veniaminof during 3-10 September. Satellite and web camera views during occasional clear periods showed no other signs of activity. Ash deposits extended onto the snowfield at and below the summit to the SSW and SE, forming a "v" shape downslope from the summit. . During 6-7 May 2009, seismic activity from Veniaminof increased, prompting AVO to raise the Volcanic Alert Level to Advisory and the Aviation Color Code to Yellow. Veniaminof volcano continues to erupt, feeding a lava flow confined to the ice-filled summit caldera, the Alaska Volcano Observatory reports. Discrete seismic events occurred at rates up to 1-2 events per minute, along with moderate levels of volcanic tremor. No thermal anomalies were observed on satellite imagery. Concentric fractures around the older cinder cone NE of the active cone were also observed. Additional details of the eruption can be found in Dixon et al., 2015. This type of activity prevailed at Veniaminof during the previous 3 months. The elevated seismicity that began in mid-December 2002 at Veniaminof continued during 7-14 March. Veniaminof remained at Concern Color Code Yellow. A water-rich plume likely containing minor amounts of ash was detected in satellite images drifting NW at an altitude of 4.5 km (15,000 ft) a.s.l. Satellite imagery recorded a hot spot at the volcano on 10 August, but no additional reports were received until 12 August, when observers in Perryville saw low-level steam-and-ash emission. Material was being thrown an estimated 150-300 m above the cone. Cloudy conditions obscured web camera views of the volcano, and no ash emissions were observed above the cloud cover. During 6-7 May, seismic activity from Veniaminof increased, prompting AVO to raise the Volcanic Alert Level to Advisory and the Aviation Color Code to Yellow. Seismicity at Veniaminof and Westdahl were the only areas in which an increase over the seismicity in 2009 was noted. The flow of seismic data from Veniaminof stopped on the evening of 21 March due to technical problems. On 8 January, Perryville residents saw an ashy vapor cloud rise from the intra-caldera cone, but they saw no glow over the volcano. Minor steam and ash emissions in November. 2004: February The ash emissions rose to below 4.6 km and drifted more than 240 km SE. Glow was seen over the summit of the volcano on the evenings of the 7th and 16th. On 2 October the amplitude increased to slightly less than half that during the June eruption (8:5, 8). Minor ashfall was recorded in Perryville (35 km E) on 25 October and 22 November 2018. On 16 July 2013 an AVO geologist visited the caldera by helicopter, making observations and taking the first close-up photographs documenting the lava flows and ice cauldron formation (figure 19). The eruptive activity reported on 3 October by Perryville residents was not distinguishable on the seismic record. The Concern Color Code remained at Yellow. No incandescent material was seen. By October 18, when clear skies allowed good views, no "hot spot" or eruption cloud was detected. The tremor was similar to seismic signals recorded the previous month in association with small ash plumes, suggesting that ash bursts continued. Vapor plumes, roaring noise, and felt earthquakes. Seismicity remained elevated during 8-12 May. "Occasional ash to [~3 km a.s.l.] Bursts of volcanic tremor continued during the week of 24 May. A weak ash plume was detected on AVHRR satellite images. Web camera views from Perryville showed a slightly more robust ash plume, extending ESE beyond the caldera rim. Residents in Perryville (32 km SSE) and Port Moller (77 km WSW) also observed ash emissions at about 2330. After 6 years of quiet, eruptive activity resumed on 30 July.
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