Volcanos

Roundup of Global Volcanic Activity:

El Hierro (Canary Islands, Spain): Another large quake of magnitude 4.6, which was widely felt on the island, just occurred at 08:14 GMT at 18 km depth about 10 km west of the island under the seabed.

Dieng (Central Java): VSI raised the alert level to the third highest level Siaga (3 out of 4), because significant changes were observed at the crater lake. The most spectacular was the change of the lake water color to dark brown on 24 March. In addition, a significant increase in CO2 concentration within 500 m from the Timbang crater was measured, from from 0.01% (by volume) in early March to 2.5% between 11 and 15 March. Also the emissions of the magmatic gas H2S increased. The now elevated gas concentrations are becoming a significant hazard (illustrated by a cat found suffocated by CO2).

Popocatépetl (Central Mexico): An increase in activity occurred last night from 20:05 h local time. Small to moderate explosions with ash emissions started to become more frequent. Incandescent tephra was thrown to up to 400-700 m distances onto the northern and northeastern slope of the volcano (see picture). At 22:30 h, the number of explosions increased to become near continuous. Glowing bombs were ejected up to 700 m distance from the crater and an ash column drifted to the northeast. This process was accompanied by continuous volcanic tremor.

Pu’u O’o vent summit cone of Kilauea in Hawaii Volcanoes National Park. © G. Brad Lewis.

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