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Volcanic activity world-wide 10 Aug 2012: Tongariro, White Island, Askja, Etna, Stromboli, Santorini, Popocatépetl, Nevado del Ruiz, Tungurahua, Sakurajima

vendredi août 10, 2012 09:23 | AUTEUR : T

Santorini\'s "tremor" waking up as usual...
Santorini\'s "tremor" waking up as usual...
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.
It is possible, that the Aug 6 eruption was only a precursor to a pending magmatic eruption, which could even be large, if the size of initial phreatic activity is in proportion to the proper magmatic eruption.

Weak ash emissions continue at White Island, producing a weak plume rising a few 100 m.

Other updates from the rest of the world include the usual candidates who have not shown much new or surprising activity:

Popocatépetl in Mexico: During the past 24 hours, 17 weak explosions occurred, and a constant steam and gas plume is rising. Glow is visible at night.

Fuego volcano: The lava flow towards Barranca Taniluya is active and reaches 200 meters length, producing small avalanches. 3 explosions were counted by the observatory yesterday and reached heights around 400 m.

Santiaguito / Santa Maria (Guatemala) produced a hot lahar yesterday at 21:50 h local time which drained large amounts of volcanic material and blocks. It lasted 15 minutes during which the windows of the observatory were vibrating.

Nevado del Ruiz (Colombia) produces a significant plume of SO2.

Tungurahua volcano: The volcano has moderately strong seismic activity with phases of tremor frequently visible, related to fluid movements. No reports of recent explosions. Direct observations have been difficult due to bad weather.

El Hierro volcano: slightly increased number of quakes during the past days, including a shallow (3 km) M2.4 event on 8 Aug in the central part of the island.

A slightly increased tremor is visible at Stromboli in the Eolian island today suggesting that activity is higher today.
At nearby Etna, tremor continues to be low and glow at night is currently not visible from Bocca Nuova, suggesting that explosions, if any, are weak.

In Iceland, Askja volcano has been showing increased signs of unrest including higher than background levels of tremor, as Diana Barnes remarked on VolcanoCafe.

A comment on rumors about elevated tremor on Santorini volcano was posted as well. It is interesting to note that "tremor" usually starts in the morning and ends at night.

Finally, Sakurajima volcano in Japan produced 2 moderate to weak explosions so far today. VAAC Tokyo alerts of ash plumes rising 2.4 and 2.1 km, respectively.
Actualités précédentes
jeudi, août 09, 2012
Tongariro volcano in New Zealand has stayed calm. First analysis of the ash confirms that the eruption did not produce any significant amount if at all of fresh magma, and therefore was so-called phreatic. ... [details]
jeudi, août 09, 2012
The new Smithsonian / USGS Weekly Volcanic Activity Report was published yesterday and is summarized as follows: ... [details]

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