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

Tuesday Jul 31, 2012 10:08 AM | DOOR: T

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.

Pacaya (Guatemala): Volcanic seismic activity above background levels is visible on the PCG station. It includes tremor and shallow volcano-tectonic earthquakes.

Santiaguito / Santa Maria (Guatemala): 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.

Popocatépetl (Mexico): 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.

Nevado del Ruiz (Colombia): 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.

The other Colombian volcanoes currently on yellow alert by INGEOMINAS, Cerro Machín, Nevado del Huila, Galeras, Cumbal and Machín have been relatively quiet the past days.

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.
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.
The third currently active volcano in Ecuador, Reventador continues to produce a lava flow on the NE flank.
Vorig nieuws
Tuesday, Jul 31, 2012
Volcanoes in Kamchatka have been relatively calm over the past week. ... [meer...]
Friday, Jul 27, 2012
No particularly unusual volcanic activity is taking place at the moment. Mainly based on the latest Smithsonian / USGS activity report, webcams and other sources, the following is a brief summary: ... [meer...]
Wednesday, Jul 25, 2012
Volcanic activity worldwide in the past weeks has mostly featured the usual, semi-permanently active volcanoes. ... [meer...]
Live data bekeken met onze webcams.volcanodiscovery.com hulpmiddel
Thursday, Jun 28, 2012
The intense seismic swarm at El Hierro volcano continues with more than 100 quakes >M1.5 so far today. The quakes are concentrated underneath the El Julan coast, and some of the most recent quakes today have been at significantly shallower levels, 15-17 km, and indicate that magma now has started to rise. ... [meer...]

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