GeoLog

volcanology

Imaggeo on Mondays: Mount Bromo – volcanic deity

Imaggeo on Mondays: Mount Bromo – volcanic deity

Featured in this photo, rising out from a sea of violet fog at dawn, is one of Indonesia’s most iconic volcanoes, Mount Bromo. The mountain is a large volcanic crater, also known as a caldera, which formed when an ancient cone volcano collapsed in the late Pleistocene and early Holocene epochs, between 126,000 and 8,300 years ago. The current structure stands at 2,392 metres in the eastern region ...[Read More]

Imaggeo on Mondays: Double strombolian explosions at Mt. Yasur volcano

Imaggeo on Mondays: Double strombolian explosions at Mt. Yasur volcano

The Yasur volcano located in Vanuatu archipelago is permanently active since its discovery in 1774 by Cpt. James Cook. Its activity consists mainly in moderate regular strombolian explosions within the crater. But sometimes, more powerful explosions throw ash and bombs beyond the crater rim and may represent a hazard for tourists and people living next to the volcano. Otherwise, the Mt Yasur displ ...[Read More]

Iceland’s rootless volcanoes

Iceland’s rootless volcanoes

Picture a volcano, like the one you learned about in primary school. Can you see it? Is it a big rocky mountain, perhaps with a bubbling pool of lava at the top? Is it perched above a chasm of subterranean molten rock? I bet you didn’t picture this: You’d be forgiven for mistaking these small volcanoes for a scene from the Lord of the Rings, or maybe a grassy version of the surface of Mars (in fac ...[Read More]

Imaggeo on Mondays: Hints of an eruption

Imaggeo on Mondays: Hints of an eruption

The photograph shows water that accumulated in a depression on the ice surface of Vatnajökull glacier in southeastern Iceland. This 700m wide and 30m deep depression [1], scientifically called an ‘ice cauldron’, is surrounded by circular crevasses on the ice surface and is located on the glacier tongue Dyngjujökull, an outlet glacier of Vatnajökull. The photo was taken on 4 June 2016, less than 22 ...[Read More]