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Volcanic activity world-wide 13 Aug 2012: new activity at Tofua (Tonga Islands), Popocatépetl, Fuego, Santiaguito, Costa Rica, Nevado del Ruiz, Reventador, Tungurahua, Sakurajima, Tongariro, White Island

Monday Aug 13, 2012 15:58 PM | BY: T

Possibly volcanic SO2 plumes over Costa Rica on 11 Aug (NOAA)
Possibly volcanic SO2 plumes over Costa Rica on 11 Aug (NOAA)
Activity has decreased at White Island. Ash emissions have been lower than in the previous days. Gas measurements showed that all volcanic gases were at levels lower than the previous measurement on August 1.

Tongariro volcano has stayed calm with and GNS scientists think that the most likely scenario is that the 6 Aug eruption was a single event and will not be followed by new eruptions in the near to medium future.

A "new" volcano just entered the watch list:
Out in the Pacific, a pilot observed an ash cloud rising from Tofua volcano to 3,000 ft (ca. 1 km) in the Tonga Islands at 04:42 GMT, VAAC Wellington reports.

El Hierro volcano: A total of 5 earthquakes (between M1.3-2.4) at 10-19 km depth has occurred today so far. This is the highest number in many days.

Activity remains weak at Popocatépetl in Mexico. About 1 weak eruption per hour has been observed during the past day by CENAPRED. SO2 emissions remain high (which is typical for Popo during phases of activity).

An elevated SO2 plume was visible above Costa Rica's Central valley on NOAA's SO2 monitoring images. It could have been caused by stronger degassing activity of the volcanoes Poas or Turrialba, both of which have been showing increased activity in 2011-12, but seem to have calmed down in the past months. Another SO2 signal is visible about 100 km east of Rincon de la Vieja and could have originated there. The Costa Rican volcano observatory doesn't mention any unusual activity.

Santiaguito / Santa Maria (Guatemala): An explosion at 05:49 local tie ejected an 800 m high ash plume and caused ash fall at Finca la Florida and around San Marcos Palajunoj. Only few and weak rock avalanches were reported since yesterday.

For Fuego volcano, INSIVUMEH reports 8 weak explosions during the past day, generating ash columns of 200-500 m height.
The lava flow in direction of Taniluya canyon has further advances and is now 300 m long and generates constant rock avalanches. Avalanches, too, have been observed towards the "Ash" (Ceniza) canyon.

In Colombia, sporadic gas and ash emissions continue to occur at Galeras and tremor signals are sometimes visible on the seismograms.
Nevado del Ruiz (Colombia): Steam and ash emissions continue at Nevado del Ruiz at fluctuating intensity. This morning a fresh ash deposit was found at the volcano observatory.
The seimic recordings show tremor and a seismic swarm with 30 quakes since 22:27 local time last night, located NE of the Arenas crater between 3-5 km, in the same area as the previous swarm on 12 August.

Reventador volcano in Ecuador ejects a 1.5 km high steam plume, but IG mentions no explosions or ash.
Tungurahua volcano continues to emit a steam plume with small amounts of ash, and has occasional small to moderate explosions accompanied by gunshot sounds heard around the volcano.

Jumping to the far north, there is little new activity to be reported from volcanoes in Kamchatka, the Kuriles, Aleutians and in Alaska. It is rather surprising that this normally very area has stayed quite calm over the past week.

Satellite observations show again plumes at 7,000 ft (2.1 km) originating from Batu Tara (Sunda Islands, Indonesia).

Sakurajima volcano has had 2 weak - moderate explosions during the past 30 hours.
Previous news
Sunday, Aug 12, 2012
Etna volcano (Italy): The tremor signal has stayed calm, but weak strombolian activity or spattering from the vent inside the Bocca Nuova is probably continuing. Interestingly, a few relatively large quakes (around M3) have occurred on the NE flank near (or on?) the Pernicana fault this morning and it will be interesting to monitor the NE rift zone in the coming months. ... [more]
Sunday, Aug 12, 2012
Earthquakes often precede eruptions, sometimes by only hours, and sometimes by several months. While most seismic activity at volcanoes is not necessarily followed by an eruption, almost all eruptions are preceded and sometimes accompanied by earthquake activity at shallow depths near the volcano. Therefore, recording earthquakes near active and dormant volcanoes is an important tool in monitoring and eruption prediction. [more]
Santorini\'s "tremor" waking up as usual...
Friday, Aug 10, 2012
Tongariro volcano has remained calm. GNS scientists measured elevated levels of SO2 and other volcanic gasses, which suggests that magma is accumulating beneath the volcano. ... [more]

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