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Volcanic activity world-wide 31 July 2012: updates for Popocatépetl, Fuego, Santiaguito, Pacaya, Nevado del Ruiz, Sangay, Reventador, Tungurahua

Tue, 31 Jul 2012, 10:08

Fuego volcano (Guatemala): Latest observations suggest a decreasing trend in activity, but strombolian eruptions continue with explosions producing 200-500 m high ash clouds, and at least one lava flow is still active. Seismic activity is at moderate levels. Read all

Cumbal volcano (Colombia) activity update: slightly increased seismicity but decreasing trend

Tue, 31 Jul 2012, 10:05

Seismic signals indicating fluid movements under the volcano are still present but have decreased. Such signals occurred on 26, 27, 29 and 30 July.

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Taal volcano (Luzon, Philippines) activity update: signs of 2011 unrest - increased water temperature, inflation - ceased

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. Read all

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Mayon volcano (Luzon Island, Philippines) activity update: currently quiet

Tue, 31 Jul 2012, 10:05

Mayon as most of the other volcanoes in the Philippines is currently quiet as the eruptions blog writes. Read all

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Reventador volcano (Ecuador), activity update: lava flow on north-eastern flank

Tue, 31 Jul 2012, 09:51

Seismic recording from Reventador 31 July (IG)

The volcano's activity remains at a level considered moderate to high Read all

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Sangay volcano (Ecuador) activity update: occasional small ash eruptions, thermal anomaly at summit crater

Tue, 31 Jul 2012, 09:45

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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Tungurahua volcano (Ecuador) activity update: degassing, fluctuating seismic activity, occasional ash emissions

Tue, 31 Jul 2012, 09:39

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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Nevado del Ruiz volcano (Colombia), activity update: possible ash emission

Tue, 31 Jul 2012, 09:05

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.

SO2 plume from Nevado del Ruiz (NOAA)

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Sotará volcano (Colombia) activity update: increased seismicity

Tue, 31 Jul 2012, 07:39

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.

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Santa Maria / Santiaguito volcano (Guatemala), activity update: continuing explosions and pyroclastic flows

Tue, 31 Jul 2012, 07:18

Santiaguito'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.

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Pacaya volcano (Guatemala) activity update: seismic activity and weak tremor, no surface activity

Tue, 31 Jul 2012, 07:14

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.

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Fuego volcano (Guatemala) activity update: strombolian activity, active lava flows

Tue, 31 Jul 2012, 07:06

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. Read all

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Popocatépetl volcano (Central Mexico) activity update: strong degassing, weak gas and steam emissions, lava glow from summit crater

Tue, 31 Jul 2012, 06:42

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. Read all

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Tongariro volcano (New Zealand): increase in earthquakes and continuing unrest

Tue, 31 Jul 2012, 06:23

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. Read all

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Volcanic activity world-wide 31 July: updates for Kamchatka - Bezymianny, Gorely, Karymski, Kizimen, Sheveluch,

Tue, 31 Jul 2012, 06:06

Volcanoes in Kamchatka have been relatively calm over the past week. Read all

Bezymianny volcano (Kamchatka, world) activity update: moderate seismic activity, thermal anomaly

Tue, 31 Jul 2012, 05:57

KVERT reports moderate seismicity and a thermal anomaly over the volcano visible on satellite data.

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Karymsky volcano (Kamchatka) activity update: moderate seismic activity

Tue, 31 Jul 2012, 05:55

Moderate seismicity of the volcano was registered, but no recent explosions.

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Shiveluch volcano (Kamchatka) activity update - explosion on 27 July

Tue, 31 Jul 2012, 05:45

KVERT 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.

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Gorely volcano (Kamchatka) activity update: moderate seismic activity

Tue, 31 Jul 2012, 05:16

Moderate seismic unrest continues at Gorely volcano.

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Kizimen volcano (Eastern Kamchatka (Russia)) activity update: gas and steam emission, incandescence from lava flow and lava dome

Tue, 31 Jul 2012, 05:14

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.

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Volcanic activity world-wide 29-30 July 2012: pyroclastic flows at Santiaguito, seismic activity at Tongariro, continuing explosions at Batu Tara & Sakurajima, updates for Fuego, Popocatéptel, Nevado del Ruiz, Santorini

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. Read all

Santiaguito volcano (Guatemala): increase of activity, lava flows and pyroclastic flows

Mon, 30 Jul 2012, 15:33

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. Read all

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Kirishima volcano in Kyushu, Japan on high alert level

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. Read all

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Sakurajima volcano (Kyushu, Japan) activity update: 1-2 moderate to strong explosions per day, plumes up to 2-2.5km

Mon, 30 Jul 2012, 10:05

VAAC Tokyo reports continued explosions at Sakurajima volcano in Japan with ash clouds reaching 2-2.5 km altitude.

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Popocatépetl volcano (Central Mexico) activity update: strong degassing, lava glow from summit crater

Mon, 30 Jul 2012, 10:05

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.

Popocatépetl on 30 July (CENAPRED)

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Tongariro volcano (North Island, New Zealand) activity update: increased seismicity

Mon, 30 Jul 2012, 10:05

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).

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Nevado del Ruiz volcano (Colombia): increased volcanic tremor on evening of 29 July

Mon, 30 Jul 2012, 08:52

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.

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Fuego volcano (Guatemala), activity update: weak explosions, lava flows

Mon, 30 Jul 2012, 08:39

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. Read all

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Pacaya volcano (Guatemala) activity update: seismic activity and weak tremor, no surface activity

Mon, 30 Jul 2012, 08:35

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.

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Batu Tara volcano (Sunda Islands, Indonesia) activity update: ash emissions up to 2 km altitude

Mon, 30 Jul 2012, 08:30

Ash clouds to about 2 km altitude were observed yesterday and today on satellite images (VAAC Darwin).

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