Wed, 29 Feb 2012, 06:00
KVERT reported that seismic activity at Shiveluch was low during 23 February-2 March. Ground-based observers and satellite imagery indicated that a viscous lava flow continued to effuse in the crater formed during a 2010 eruption. Seismic activity increased on 28 February and hot avalanches likely occurred at the lava dome.
Wed, 29 Feb 2012, 06:00INSIVUMEH reported that during 1-2 March explosions from Santa María's Santiaguito lava-dome complex generated ash plumes that rose 800 m above the crater and drifted 20 km W and SW. Block avalanches descended the SW flank, and lava flows were active on the S, SW, and NE flanks. Based on analyses of satellite imagery, the Washington VAAC reported that during 3-4 March ash plumes drifted SW.
Wed, 29 Feb 2012, 06:00
Based on seismicity detected during 28 February-4 March, OVDAS-SERNAGEOMIN reported that the eruption from the Cordón Caulle rift zone, part of the Puyehue-Cordón Caulle volcanic complex, continued at a low level. During 28-29 February plumes observed with a web camera and satellite images rose 1 km above the crater and drifted 40 km NNE. During 2-3 March plumes rose 0.7-3 km above the crater and drifted SE.
Wed, 29 Feb 2012, 06:00CENAPRED reported that during 1-6 March steam-and-gas emissions rose from Popocatépetl. Emissions contained small amounts of ash on 1 March and crater incandescence was observed at night. During the night on 2 March crater incandescence rose 200-300 m above the crater.
Wed, 29 Feb 2012, 06:00
KVERT reported moderate seismic activity at Kizimen during 24 February-2 March and a large thermal anomaly that was detected in satellite images on most days. Video and satellite observations indicated both continued effusion of a large lava flow on the E flank and hot avalanches. Video data also showed strong gas-and-steam activity.
Wed, 29 Feb 2012, 06:00During 29 February-6 March, HVO reported that the lava lake circulated and periodically rose and fell in the deep pit within Kilauea's Halema'uma'u Crater. Web camera views and satellite images indicated that lava flows continued to advance, reaching more than 7.5 km SE of Pu'u 'O'o. Active flows were also visible at the top of the pali SE of Pu'u 'O'o.
Wed, 29 Feb 2012, 06:00
KVERT reported that seismic activity continued at a moderate level at Karymsky during 24 February-2 March, and indicated that possible ash plumes rose to an altitude of 3.9 km (12,800 ft) a.s.l. during 23-27 February. Satellite imagery showed a thermal anomaly on the volcano on 25 February; clouds obscured views on the other days.
Wed, 29 Feb 2012, 06:00Instituto Geográfico Nacional (IGN) reported that during 29 February-6 March the seismic amplitude detected by every IGN station in El Hierro remained at very low values. Neither water discoloration nor activity was observed on the sea surface over the emission area. On 5 March, the Scientific Committee stated that the submarine eruption was over, but the volcanic process that started on mid July 2011 had not finished.
Wed, 29 Feb 2012, 06:00
INSIVUMEH reported that during 1-2 March explosions from Fuego produced ash plumes that rose 600 m above the crater and drifted 15 km W and SW. Ashfall was reported in Yepocapa (W), Sangre de Cristo (W), and Panimache II (SW). Some explosions produced rumbling and degassing sounds.
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Wed, 29 Feb 2012, 06:00Based on analyses of satellite imagery, the Darwin VAAC reported that on 7 March an ash plume from Bagana rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 37 km SW.
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Wed, 29 Feb 2012, 06:00
Based on information from JMA, the Tokyo VAAC reported that during 29 February-7 March explosions from Sakura-jima often produced plumes that rose to altitudes of 1.2-3 km (4,000-10,000 ft) a.s.l. and drifted NW, E, and SE. A pilot observed an ash plume on 5 March.
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Wed, 29 Feb 2012, 06:00IG reported that during 29 February-2 March cloud cover prevented views of Tungurahua. On 3 March seismicity increased. Clouds mostly prevented observations; during breaks in the cloud cover ash plumes were observed rising 3 km above the crater and drifting S and SW.
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Wed, 29 Feb 2012, 06:00
AVO reported that the level of unrest at Kanaga declined to background levels. On 2 March the Volcano Alert Level was lowered to Normal and the Aviation Color Code was lowered to Green.
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Wed, 29 Feb 2012, 06:00Sezione di Catania - Osservatorio Etneo reported that the third episode of lava fountaining from Etna's New Southeast Crater (New SEC) occurred on the morning of 4 March and was more explosive than the preceding episode. The beginning of the eruption was characterized by a rapid increase in volcanic tremor amplitude coincident with Strombolian explosions that increased in intensity and frequency. Just after 0800 lava overflowed the deep breach in the SE rim of the crater and reached the SE base of the cone within 15 minutes, then advanced towards the W rim of the Valle del Bove.
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Wed, 29 Feb 2012, 06:00
AVO reported that during 24 February-2 March satellite images of Cleveland revealed no unusual activity and no significant changes in the size of the lava dome. A weak thermal anomaly was detected in satellite imagery on 3 March. The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange.
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Wed, 29 Feb 2012, 06:00KVERT reported that during 24 February-2 March seismic activity at Bezymianny remained elevated, with about 7-19 weak events registered daily. A thermal anomaly was detected in satellite images. Gas-and-steam activity was observed on 26 February; clouds obscured the volcano on the other days.
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Tue, 28 Feb 2012, 11:05
During 17-24 February low levels of seismic activity were detected. Satellite imagery showed a weak thermal anomaly. A viscous lava flow continued to effuse in the 2010 crater. Moderate fumarolic activity at the lava dome.
Tue, 28 Feb 2012, 11:05Explosions on 22 and 24 February produced plumes that rose to altitudes of 1.5-1.8 km (5,000-6,000 ft) a.s.l. and drifted NE.
Tue, 28 Feb 2012, 11:05
The eruption from the Cordón Caulle rift zone continued at a low level. A lava flow reached the valley of the Nilahue River, and 2 lava flows advanced to the N margin of the W crater.
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Tue, 28 Feb 2012, 11:05CENAPRED reported that during 22-28 February steam-and-gas emissions rose from Popocatépetl and crater incandescence was observed at night. Ash plumes rose 500-900 m above the crater during 22-24 February.
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Tue, 28 Feb 2012, 11:05
During 17-24 February, KVERT reported moderate seismicity at Kizimen, strong gas-and-steam activity, and a large thermal anomaly that was detected daily in satellite images. Video and satellite observations indicated both continued effusion of a large lava flow on the E flank and accompanying hot avalanches. A large avalanche on the E flank, W of the lava flow, was observed on 21 February, and an ash plume rose to an altitude of 1 km (3,280 ft) a.s.l. On 22 February about 20 avalanches were reported.
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Tue, 28 Feb 2012, 11:05KVERT reported high levels of seismic activity at Bezymianny during 17-24 February and a thermal anomaly that was detected daily in satellite images. Two short volcanic tremor episodes were reported on 15 and 22 February. Gas-and-steam plumes, observed in satellite images, drifted NE on 20 and 22 February.
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Tue, 28 Feb 2012, 11:05
Santiaguito volcano in Guatemala has been displaying a slightly elevated state of activity in recent days. INSIVUMEH reports moderate explosions about every 15 minutes that eject plumes of gray ash tot 600 and 800 meters above the crater, and producing an ash plume drifting to the west and SW until dissipating at about 15 km distance.
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Tue, 28 Feb 2012, 11:05No unusual activity was observed in seismic data or mostly cloudy satellite images of Kanaga volcano in the past 24 hours.
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Tue, 28 Feb 2012, 08:49
Sun, 26 Feb 2012, 23:09
Sun, 26 Feb 2012, 08:07
Once more, it seems that the eruption is weakening or ending. Although a weak jacuzzi and stain on the ocean remains visible on the webcam, volcanic tremor is now zero since last night (or the instruments are dead). A small number (5-10 per day, typically) of small earthquakes clustered at around 10 km depth in the SW part of the island continue.
Sun, 26 Feb 2012, 06:56From 12:30 hours local time on February 23, a new increase in seismic activity of the Nevado del Ruiz volcano began, characterized by the occurrence of shallow earthquakes associated with fluid movements and fracturing of rock. INGEOMINAS also measured increased SO2 emissions and some changes in strain measurements.
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