Reventador volcano (Ecuador): growing lava dome and change to more explosive eruption style

Wednesday, November 21, 2012
By Paul Martin

Volcanodiscovery.com
Tuesday Nov 20, 2012

Reventador volcano’s activity continues at elevated levels with the possibility of larger explosive eruptions and pyroclastic flows, according to the latest report of the Instituto Geofísico.
During the first months of 2012, the volcano started to produce lava flows and build up a new lava dome that has by now over-topped the Nov 2002 crater rim. Over the past months, there has been a steady in crease.
Steam plumes above the crater were mostly less than 500 m tall in the first months, they started to be larger since 4 Nov, when heights of the plume at times reached 3 km height during moderate ash explosions. In parallel, seismic activity increased as well.

From 16 Nov, seismicity increased again to higher energy levels and increased frequency of harmonic tremor pulses. This went along with the occurrence of emission columns containing ash that reached 4000 m above the summit and drifted mainly to the N and NW. Light ash falls occurred in areas located between the volcano and the town of Chaco.

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