Tue, 31 Jul 2012, 10:05
The water of the Taal caldera lake has become cooler and less acidic and GPS measurements have been showing deflation since August of 2011. This suggests that the unrest at Taal in 2011 was likely an intrusion that has since ceased, the Eruptions Blog writes.
Tue, 31 Jul 2012, 10:05Mayon as most of the other volcanoes in the Philippines is currently quiet as the eruptions blog writes.
Seismic recording from Reventador 31 July (IG)
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MODIS thermal image of Sangay showing the heat source at the summit crater (Univ. Hawaii)
A pilot observed a small ash eruption from the remote Sangay volcano on 28 July. A thermal signal at the summit is visible, suggesting lava dome growth and or strombolian activity.
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Seismogramm RETU station 29 July (IGN)
Seismic data suggest a phase of increased activity occurred at Tungurahua volcano in Ecuador on 29 July, but there are no recent reports of new ash emissions. At the moment, the seismicity is rather calm.
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OLLZ station seismogramm showing the (black) signal at 20:02 possibly indicating an ash emission
At 20:02 (Local time) on 30 July, the Manizales oservatory observed a seismic signal probably reflecting an ash eruption from Nevado del Ruiz. The signal was similar to those recorded on 10 and 19 April and 22 May 2012 when ash eruptions occurred. Seismic activity at Nevado del Ruiz is elevated and the volcano is producing an important SO2 plume.
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SO2 plume from Nevado del Ruiz (NOAA)
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Seismic recording from Sotara (29 July) (INGEOMINAS)
Volcanic unrest has been detected recently at Sotara volcano. An increased number of small volcanic earthquakes is visible on seismic recordings.
Tue, 31 Jul 2012, 07:18Santiaguito's activity continues at elevated levels. During 29-30 July, INSIVUMEH reports weak to moderately strong explosions that produced ash columns reaching 1,500 meters height and moving west southwest for 12 km. At night the sounds of pyroclastic flows could be heard. White steam plumes rise from the lava dome to 400 m height.
Tue, 31 Jul 2012, 07:14
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Seismic recording from Pacaya volcano on 31 July (INSIVUMEH)
Volcanic seismic activity is visible on the PCG station, tremor and shallow volcano-tectonic earthquakes above backgroud levels.
Tue, 31 Jul 2012, 07:06
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Fuego early on 31 July (INSIVUMEH)
Fuego's activity has decreased a bit during the past days. The latest report from early 30 July from the observatory counts 9 weak strombolian explosions during the previous day with incandescent bombs reaching 100 m height ash clouds of 200-500 m height, drifting 10 km to the W and NW.
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Tue, 31 Jul 2012, 06:42
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Popocatépetl early on 31 July (CENAPRED)
Exhalations of gas and ash have dropped to 1-2 per hour (versus 3-4 times per hour during heightened activity). Seismic activity is low. A small 1.8 volcanic earthquakes occurred at 11:36 local time on 30 July.
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Tue, 31 Jul 2012, 06:23
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Recent earthquakes at Tongariro (GeoNet)
Sesimic activity has picked up under Tongariro volcano in New Zealand, GeoNet confirms in its latest bulletin. The earthquake activity had started on 13 July, peaked on 20 July, sharply decreased and picked up again with currently about 3-10 events per day. The earthquakes cluster in a zone between Mount Tongariro and the eastern side of Lake Rotoaira at 2-7 km depth. They are mostly very small and unlikely to be felt.
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Tue, 31 Jul 2012, 06:06
Volcanoes in Kamchatka have been relatively calm over the past week.
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Tue, 31 Jul 2012, 05:57KVERT reports moderate seismicity and a thermal anomaly over the volcano visible on satellite data.
Tue, 31 Jul 2012, 05:55
Moderate seismicity of the volcano was registered, but no recent explosions.
Tue, 31 Jul 2012, 05:45KVERT reports moderate seismicity, steaming and degassing, as well as a thermal anomaly visible on satellite data. Tokyo VAAC reported that on 27 July an eruption produced an ash plume that rose to an altitude of 10.1 km (33,000 ft) a.s.l.
Tue, 31 Jul 2012, 05:16
Moderate seismic unrest continues at Gorely volcano.
Tue, 31 Jul 2012, 05:14
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MODIS thermal image of Kizimen showing the heat sources from the lava dome and the lava flow on the east flank (Univ. of Hawaii)
Kizimen is still erupting, but the eruption has further decreased. KVERT reports moderate seismicity, gas and steam emission and incandescences above the lava flow and crater.
Mon, 30 Jul 2012, 16:26
Batu Tara (Sunda Islands, Indonesia) continues to be active. Ash clouds to about 2 km altitude were obverved yesterday and today on satellite images.
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Mon, 30 Jul 2012, 15:33
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Seismic signal (Parador station) from the night 28-29 July (INSIVUMEH)
Santiaguito volcano has showed an increase in activity yesterday morning INSIVUMEH reports in its latest special bulletin.
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Mon, 30 Jul 2012, 10:30
As our colleague Marc Szlegat reported on Vulkane.Net, the alert level of the Japanese Kirishima volcano (Kirishimayama) was raised last month"orange". This is the third out of 4 warning levels and means that an eruption could occur any time.
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Mon, 30 Jul 2012, 10:05VAAC Tokyo reports continued explosions at Sakurajima volcano in Japan with ash clouds reaching 2-2.5 km altitude.
Mon, 30 Jul 2012, 10:05
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SO2 plume from Popocatépetl on 29 July (NOAA)
Eruptive activity remains reduced at Popocatepetl, but the volcano continues to emit a significant amount of SO2, and volcanic tremor and lava glow are visible. In fact, Popo is known to be one of the top-performers of SO2 emission among all known volcanoes.
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Popocatépetl on 30 July (CENAPRED)
Mon, 30 Jul 2012, 10:05
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Seismic signal at Tongariro volcano 30 July (GeoNet)
A lot of seismic activity appears on the seismograph visible at Tongariro. There are no new reports by Geonet, and the status remains at yellow (1 out of 4).
Mon, 30 Jul 2012, 08:52
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Seismic recording from Nevado del Ruiz 29-30 July
A period of increased tremor occurred overnight at Nevado Del Ruiz volcano (station OLLE). The tremor at the volcano has since subsided to low levels.
Mon, 30 Jul 2012, 08:39
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Fuego volcano seismogram reflecting the activity today
On 29 July, INSIVUMEH observed 6 explosions producing gray columns reaching heights of 300 m and drifting to the W and NW and causing avalanches of incandescent material on the upper flanks. Glowing bombs were seen ejected to up to 100 m above the crater and strong rumbling and jet-engine like sounds accompanied the explosions.
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Mon, 30 Jul 2012, 08:35
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Seismic recording from Pacaya volcano (INSIVUMEH)
Seismic activity at Pacaya continues to be elevated and tremor is visible, suggesting magma movements under the volcano. There is no eruptive activity at the surface.
Mon, 30 Jul 2012, 08:30Ash clouds to about 2 km altitude were observed yesterday and today on satellite images (VAAC Darwin).
