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Volcano activity of November 7, 2012
Thursday, November 8, 2012 3:40
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(Before It's News)
The best independent earthquake reporting website in the world
This (almost) daily post intends to follow up the activity changes of volcanoes all over the world.
This post is written by geologist Richard Wilson who specializes in Volcano seismicity and Armand Vervaeck. Please feel free to tell us about new or changed activity if we haven’t written about it. -
November 7, 2012 volcano activity
A little more activity to report today.
The shallow earthquake swarm I was expecting at or near Mammoth Mountain volcano (CA), appears to have begun,…in nearby Long Valley Caldera. (station MRD). As with the precursory deep low-frequency earthquake swarm at Mammoth Mountain on 29 October, the shallow earthquakes are accompanied by a deflection in the trend of deformation recorded on nearby dilatometers, though nowhere as pronounced as that which occurred with the deep swarm (so far).
Frequent (An average of more than two per hour) exhalations of gas and ash continue at Popocatepetl volcano (Mexico) today. The seismogram recorded at the volcano today shows a mix of exhalation signals (upper), a regional earthquake (middle), and small local earthquakes imprinted over weak volcanic tremor (lower).
Volcanic tremor has strengthened (or become more visible without the telemetry(?) interference that has plagued INSIVUMEH seismograms the past week!) at Pacaya, Fuego and Santa Maria volcanoes (Guatemala). (stations PCG, FG3, and STG6 respectively)
Another burst of volcano-tectonic earthquakes is underway within Nevado Del Ruiz volcano (Colombia) this morning. The persistence (and strengthening?) of the activity suggests renewed magma intrusion beneath the volcano. (station OLLZ)
Trains of low amplitude earthquakes are apparent on the seismogram recorded at Tongariro volcano (New Zealand) today. This is a departure from the relatively quiet behavior of the volcano over the past few months. Local earthquakes are also occurring at nearby Ruapehu volcano, along with periods of low-level volcanic tremor. Offshore from the North Island, White Island quivers with continuous volcanic tremor again today.
Recent satellite imagery depicts relatively weak SO2 plumes issuing from Popocatepetl, Turrialba/Poas volcanoes (Costa Rica), Nevado Del Ruiz, Ambrym (Vanuatu), Bagana (New Guinea) and Dukono (Indonesia), and a strong plume of SO2 over/near Nyiragongo volcano (DRC).
2012-11-08 02:47:09
Source: http://earthquake-report.com/2012/11/08/volcano-activity-of-november-7-2012/
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