Wed, 30 Nov 2011, 06:00
CVGHM raised the Alert Level for Gamalama from 2 to 3 (on a scale of 1-4) on 4 December based on seismicity and visual observations during 1-4 December. On 1 and 4 December white plumes rose to an altitude of 0.15 km (492 ft) a.s.l. and drifted W. Clouds obscured views on the other days.
Wed, 30 Nov 2011, 06:00A Northern Mariana Islands status report noted that clear to partly-cloudy satellite images showed a persistent gas-and-steam plume drifting from Pagan during 25 November-2 December. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory.
Wed, 30 Nov 2011, 06:00
IG reported that seismicity has remained the same from the previous week from Tungurahua, but the number of explosions has increased during 30 November-6 December. Incandescent blocks traveled 1 km down the flanks, and roaring noises and sounds resembling "cannon shots" were reported all week. Ashfall was reported from almost all populations near the volcano during the week.
Wed, 30 Nov 2011, 06:00Based on information from JMA, the Tokyo VAAC reported that during 30 November and 2-6 December explosions from Sakura-jima produced plumes that rose to altitudes of 1.2-3.0 km (4,000-10,000 ft) a.s.l. and drifted NE, E, SE, W, NW. Satellite imagery and a pilot report on 30 November showed an ash plume at an altitude 3.7 km (12,000 ft) a.s.l and drifted 37 km SE.
Wed, 30 Nov 2011, 06:00
Based on analyses of satellite imagery, the Darwin VAAC reported that on 29 November ash plumes from Dukono rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 65 km NW.
Wed, 30 Nov 2011, 06:00Instituto Geográfico Nacional (IGN) reported that during 30 November-6 December the submarine eruption continued S of El Hierro Island, with lava balloons sporadically observed floating on the sea. During this period, the mean tremor amplitude was similar to the previous week. Twenty-eight seismic events were located, most of them offshore to the N of the island at depths of 15-24 km and with a maximum magnitude of 2.8.
Wed, 30 Nov 2011, 06:00
KVERT reported that seismic activity continued at a moderate level at Karymsky during 25 November-2 December and indicated that possible ash plumes rose to an altitude of 3.8 km (12,500 ft) a.s.l. during the week. Satellite imagery showed a thermal anomaly on the volcano during 28-30 November and 1 December.
Wed, 30 Nov 2011, 06:00During 30 November-6 December, HVO reported that the lava lake circulated and periodically rose and fell in the deep pit within Kilauea's Halema'uma'u Crater, remaining below the inner ledge (75 m below the crater floor). Almost daily measurements indicated that the gas plume from the vent continued to deposit variable amounts of ash and fresh spatter nearby. Incandescence was visible from the E and W edges of the Pu'u 'O'o crater floor, and from the 21 September fissure on the SE flank of Pu'u 'O'o cone.
Wed, 30 Nov 2011, 06:00
KVERT reported a decrease in seismic activity at Kizimen during 25 November-2 December and a thermal anomaly that was detected daily in satellite images. A large lava flow on the NE and E flanks continued to effuse. The video camera was down due to technical reasons during the week.
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Wed, 30 Nov 2011, 06:00CENAPRED reported that during 30 November-6 December steam-and-gas emissions rose from Popocatépetl and crater incandescence was observed during most nights and early mornings. Steam-and-gas emissions occasionally contained small amounts of ash on 30 November and 5 December.
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Wed, 30 Nov 2011, 06:00
Based on seismicity during 30 November-6 December, 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 1-3 and 5 December plumes observed with the web camera rose 1.5-3 km above the crater. On 1 December satellite imagery showed an ash plume drifting 90 km SSE with sparse ashfall to the W and NW and dissipated 100 km to the SE.
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Wed, 30 Nov 2011, 06:00KVERT reported that moderate seismic activity was detected at Shiveluch during 25 November-2 December, and satellite imagery showed a daily thermal anomaly over the lava dome. Ground-based observers noted that a viscous lava flow continued to effuse in the crater formed during a 2010 eruption. A gas-and-steam plume detected in satellite imagery drifted 22 km NW on 26 November.
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Tue, 29 Nov 2011, 21:37
Tungurahua, Equador´s most active volcano and one of its most dangerous ones, has started a new eruption. Hundreds of people living in nearby villages have been evacuated.
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Sun, 27 Nov 2011, 09:01
Floating steaming lava blocks
[update 27 Nov]
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Fri, 25 Nov 2011, 19:36
The Colombian volcano monitoring institute INGEOMINAS has raised the alarm level for Galeras volcano, after a number of so-called tornillos, a characteristic seismic signal often preceding eruptions at Galeras, were detected in recent days. Tornillos consist of a screw-driver shaped signal of rapdily increasing and then slowly decreasing harmonic tremor and preceded most eruptions of Galeras between 1992 and 2010.
Thu, 24 Nov 2011, 10:22
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The active area seen from the South coast.
The area of upwelling water above the new submarine vent(s) ca. 1 km off the south coast near La Restinga has increased. Muddy water and sometimes foam are visible at the spot, forming larger and smaller circular areas surrounded by greenish water drifting west. The activity occurs in irregular intervals of typically 20-40 minutes.
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Wed, 23 Nov 2011, 06:00
INGEOMINAS reported that during 15-22 November steam from Galeras rose from the main crater, two craters to the N and SW (Paisita and Chavas, respectively), and a crack on the N flank of the active cone. Seismicity was at low levels, although some earthquakes were characterized as "tornillo-type." During 23-24 November the seismic network detected an emerging seismic pattern of "tornillo-type" earthquakes similar to patterns detected prior to past eruptions. Gas emissions also decreased.
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Wed, 23 Nov 2011, 06:00IG reported that increased seismicity from Tungurahua was detected at 1540 on 27 November, and at 1650 the seismic network recorded four volcano-tectonic earthquakes. Two small explosions at 1701 and 1705 were followed by a large explosion at 1718. Pyroclastic flows descended the Achupashal, Chotanpamba, and Mandur drainages on the NW and W flanks.
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Wed, 23 Nov 2011, 06:00
Based on information from JMA, the Tokyo VAAC reported that during 23 and 25-29 November explosions from Sakura-jima produced plumes that rose to altitudes of 1.8-2.7 km (6,000-9,000 ft) a.s.l. and drifted W, S, E, and NE.
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Wed, 23 Nov 2011, 06:00Based on analyses of satellite imagery, the Darwin VAAC reported that during 27-28 November ash plumes from Dukono rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 65-110 km NW.
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Wed, 23 Nov 2011, 06:00
Instituto Geográfico Nacional (IGN) reported that during 23-29 November the submarine eruption continued S of El Hierro Island. During this period, the mean amplitude of the tremor showed a slight increase. On 26 November large steaming fragments of lava appeared intermittently floating over the emission center.
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Wed, 23 Nov 2011, 06:00KVERT reported that seismic activity continued at a moderate level at Karymsky during 18-25 November and indicated that possible ash plumes rose to an altitude of 2.8 km (9,200 ft) a.s.l. during 19-22 November. Satellite imagery showed a thermal anomaly on the volcano during 18, 20, and 24 November.
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Wed, 23 Nov 2011, 06:00
During 23-29 November, HVO reported that the lava lake circulated and periodically rose and fell in the deep pit within Kilauea's Halema'uma'u Crater, remaining below the inner ledge (75 m below the crater floor). Almost daily measurements indicated that the gas plume from the vent continued to deposit variable amounts of ash and fresh spatter nearby. Incandescence was visible from the E and W edges of the Pu'u 'O'o crater floor, and from the 21 September fissure on the SE flank of Pu'u 'O'o cone.
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Wed, 23 Nov 2011, 06:00KVERT reported moderate seismic activity at Kizimen during 18-25 November and a thermal anomaly that was detected daily in satellite images. A large lava flow on the NE and E flanks continued to effuse, and the crater was occasionally incandescent at night. Video observations showed gas-and-steam activity during 20 and 22-24 November.
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Wed, 23 Nov 2011, 06:00
CENAPRED reported that during 22-28 November steam-and-gas emissions rose from Popocatépetl and crater incandescence was observed during most nights and early mornings. Steam-and-gas emissions occasionally contained small amounts of ash on 29 November.
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Wed, 23 Nov 2011, 06:00Based on seismicity during 23-28 November, 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. Cloud cover prevented web camera views during 24-25 November, but satellite imagery showed a discontinuous ash plume drifting E and reaching the Atlantic Ocean on 24 November, and a fan-shaped ash plume spreading NE to SE on 25 November. Plumes observed with the web camera during 26-27 November rose 2.3-2.5 km above the crater.
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Wed, 23 Nov 2011, 06:00
INSIVUMEH reported that during 24-25 November block avalanches originated from the crater at Santa María's Santiaguito lava-dome complex as well as from lava flows. Ash plumes rose 500 m above the crater and drifted SW. During 28-29 November explosions generated shock waves and rumbling noises, as well as ash plumes that rose 700 m above the crater and drifted W.
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Wed, 23 Nov 2011, 06:00KVERT reported that moderate seismic activity was detected at Shiveluch during 18-25 November, and satellite imagery showed a daily thermal anomaly over the lava dome. Ground-based observers noted that a viscous lava flow continued to effuse in the crater formed during a 2010 eruption. An ash plume detected in satellite imagery drifted 21 km W on 18 November.
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