Based on seismicity during 31 August-5 September, 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. Although cloudy weather mostly prevented satellite and camera observations of the vent, plumes detected in satellite imagery during 31 August-1 September drifted SE and SW. A plume observed by an area camera on 1 September rose 1 km above the crater.
A Northern Mariana Islands status report noted that during 26 August-2 September low-level vapor plumes from Pagan, possibly containing minor amounts of ash, were visible in satellite imagery. Reports from people on Pagan Island also indicated intermittent low-level but diffuse ash emissions and trace amounts of ashfall on parts of the island. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory.
Based on notifications from JMA, the Tokyo VAAC reported that during 31 August-6 September ash plumes from Kirishima's Shinmoe-dake (Shinmoe peak) rose to altitudes of 1.5-2.1 km (5,000-7,000 ft) a.s.l. and drifted N, S, and SW.
KVERT reported that during 26 August-1 September moderate seismic activity continued at Karymsky, indicating that possible ash plumes rose to an altitude of 3 km (10,000 ft) a.s.l. Gas-and-steam plumes containing ash drifted 40 km E on 26 and 29 August. A thermal anomaly on the volcano was detected by satellite during 26 and 29-30 August.
Based on information from JMA, the Tokyo VAAC reported that during 31 August-6 September explosions from Sakura-jima produced plumes that rose to altitudes of 1.2-3 km (4,000-10,000 ft) a.s.l. and drifted SW, S, and SE. According to a news article, the 660th explosive eruption in 2010 occurred on 3 September.
CENAPRED reported that on 29 August instances of emissions of gas, steam, and some ash from Popocatépetl increased. The next day an ash plume rose 1 km above the crater and drifted WNW, producing ashfall in San Pedro Nexapa (14 km NW) and Amecameca (19 km NW). CENAPRED noted that recent rain in the area may have contributed to the recent increase in activity.
On 31 August OVSICORI-UNA reported that since mid-July incandescence was visible during the day on the lava dome of Poás, which had not occurred since 1981, and was the result of changes in activity that had started several months before. OVSICORI-UNA speculated that the changes could be either from recent magma intrusion or a change in the hydrothermal plumbing system and noted the need to further analyze data from seismic, deformation, geochemical, and field measurements.
CVGHM reported that during 26-31 August seismicity at Lewotobi increased. Plumes of "smoke" rose 15-50 m above the Lewotobi Perampuan crater rim; no other significant changes were visibly apparent. Based on the seismic data, the Alert Level was raised to 2 (on a scale of 1-4) on 31 August.
Wed, 31 Aug 2011, 06:00
KVERT reported that during 26 August-1 September the number and magnitude of volcanic earthquakes at Kizimen continued to increase; about 1,000 earthquakes were detected daily. Satellite images showed a large bright thermal anomaly on the volcano all week and gas-and-steam plumes that drifted 60 km E on 26 and 29 August. Lava on the E flank continued to flow.
Read allWed, 31 Aug 2011, 06:00
During 31 August-6 September, HVO reported that the level of the lava-lake surface in the deep pit within Kilauea's Halema'uma'u crater periodically fluctuated but remained mostly stable below the inner ledge 75 m below the crater floor. Periodic measurements indicated that the gas plume from the vent continued to deposit variable amounts of ash and occasionally fresh spatter nearby. At Pu'u 'O'o'crater, lava from sources on the E portion of the crater floor fed a perched lava lake.
Read allWed, 31 Aug 2011, 06:00
On 30 August, AVO reported that satellite observations during the previous two weeks indicated that lava-dome growth at Cleveland had paused. AVO lowered the Volcano Alert Level to Advisory and the Aviation Color Code to Yellow. During 31 August-2 September cloud cover prevented views of the summit crater, but a thermal anomaly at the summit was observed during 3-5 September.
Read allMon, 29 Aug 2011, 07:05
Another powerful eruption with an intense peak activity of tall lava fountains - a so-called paroxysm - occurred at Etna volcano's New SE crater earlier today. This marks the 12th event of the series in 2011 so far. The main phase of the eruption lasted between around 5 and 7 am local time.
Read allWed, 24 Aug 2011, 06:00
KVERT reported that seismic activity at Shiveluch was moderate during 19-26 August, and indicated that possible ash plumes rose to an altitude of 8.2 km (26,900 ft) a.s.l. on 23 August. A thermal anomaly on the volcano was observed in satellite imagery on 18, 21, and 25 August.
Read allWed, 24 Aug 2011, 06:00
Based on seismicity during 24-25 August, 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. A predominantly white plume observed by an area camera rose 1 km above the crater. The seismic network detected four explosions that caused the plume to turn gray.
Read allWed, 24 Aug 2011, 06:00
CENAPRED reported that, although cloud cover often prevented observations of Popocatépetl during 24-30 August, steam-and-gas emissions were occasionally noted. Based on reports from CENEPRED and the Mexico City MWO, the Washington VAAC reported ash emissions during 28-29 August.
Read allWed, 24 Aug 2011, 06:00
According to a news article, activity from Tompaluan crater, in the saddle between the Lokon-Empung peaks, decreased on 29 August after erupting several times the previous week and specifically 12 times on 28 August. One explosion on 29 August ejected material 250 m above the crater. The article also noted that 222 people remained at temporary refugee camps because their homes were located within 3 kilometers of the crater.
Read allWed, 24 Aug 2011, 06:00
KVERT reported that during 19-26 August seismicity from Kizimen was above background levels; volcanic-tremor magnitude gradually increased and several hundred earthquakes were detected the previous week. Video images showed moderate fumarolic activity. A lava flow on the E flank was active.
Read allWed, 24 Aug 2011, 06:00
KVERT reported that during 19-26 August moderate seismic activity continued at Karymsky, indicating that possible ash plumes rose to an altitude of 5.2 km (17,000 ft) a.s.l. A thermal anomaly on the volcano was detected by satellite during 21-25 August. Gas-and-steam plumes containing ash drifted 18 and 65 km E on 18 and 24 August, respectively.
Read allWed, 24 Aug 2011, 06:00
Based on analyses of satellite imagery, the Darwin VAAC reported that during 23-30 August ash plumes from Batu Tara rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 20-90 km N, NW, and W.
Read allWed, 24 Aug 2011, 06:00
Based on information from JMA, the Tokyo VAAC reported that during 23-30 August explosions from Sakura-jima produced plumes that rose to altitudes of 1.2-3 km (4,000-10,000 ft) a.s.l. and drifted SW, W, NW, N, and NE. On 30 August a pilot observed an ash plume that rose to an altitude of 1.2 km (4,000 ft) a.s.l.
Read allWed, 24 Aug 2011, 06:00
Based on visual observation and seismic data, CVGHM reported an increase in activity at Tambora during the previous five months. Ground-based observers at an observation post in Tambora village noted dense white plumes rising 50-75 m above the caldera rim during April and June, but no plumes during May or July. In August dense white plumes rose 20 m above the caldera rim.
Read allWed, 24 Aug 2011, 06:00
CVGHM reported that observers of Anak Ranakah, a lava dome that formed in 1987 at the base of the large older lava dome of Ranakah, noted white plumes rising up to 10 m high during January-24 August. Seismicity initially increased in December 2010, but increased again during June-August. Based on visual observations and seismic data analyses, CVGHM raised the Alert Level to 2 (on a scale of 1-4) on 26 August.
Read allWed, 24 Aug 2011, 06:00
On 26 August CVGHM reported that Papandayan showed minor to no changes in recent seismicity, deformation, geochemistry, and visual observations; therefore the Alert Level remained at 3 (on a scale of 1-4). Seismicity remained high, but stable, and was dominated by shallow volcanic earthquakes. Deformation measurements showed no change, and water temperatures in multiple fumarolic areas and lakes remained relatively unchanged.
Read allWed, 24 Aug 2011, 06:00
During 24-30 August, HVO reported that the level of the lava-lake surface in the deep pit within Kilauea's Halema'uma'u crater periodically fluctuated but remained below the inner ledge 75 m below the crater floor. At Pu'u 'O'o'crater, lava from sources on the E and S portions of the crater floor fed a lava lake that was formed during 25-26 August. A new source opened at the W edge of the crater floor during 29-30 August, and lava quickly spread N and S along the base of the W crater wall.
Read allWed, 24 Aug 2011, 06:00
Sezione di Catania - Osservatorio Etneo reported that nine days after the previous episode, the New SE Crater produced its twelfth paroxysmal eruptive episode of 2011 during the early morning of 29 August. The event was preceded by an explosion at 2252 on 27 August, and a series of ash emissions from the New SE Crater almost 15 hours later. Weak Strombolian activity visible during the evening on 28 August intensified during the night.
Read allWed, 24 Aug 2011, 06:00
Based on analyses of satellite imagery, the Darwin VAAC reported that on 23 August an ash plume from Bagana rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted 93 km SW.
Read allMon, 22 Aug 2011, 16:49
Stromboli volcano continues to be at an elevated level of activity, with frequent long-lasting spattering episodes from the NE crater, and occasional lava flows on the crater terrace. This indicates that the magma level inside its conduits is still unusually high.
Sat, 20 Aug 2011, 07:48
Tremor amplitude at 9h40 local time...
The 11st paroxysm of Etna's New SE crater is taking place. Strombolian activity and increased degassing started late during the night and early morning. The activity increased into lava fountains producing a tall ash column probably between 8 and 9 am. A lava flow is emitted that descends into the Valle del Bove.
