GeoLog

Tectonics and Structural Geology

Imaggeo on Mondays: A fold belt within a grain

May 25, 2015
Imaggeo on Mondays: A fold belt within a grain
A fold belt within a grain. Credit: Sina Marti (distributed via imaggeo.egu.eu)

Tiny crinkly folds form the main basis of today’s Imaggeo on Mondays. Folding can occur on a number of scales; studying folds at all scales can reveal critical information about how rocks behave when they are squeeze and pinched, as described by Sina Marti, from the University of Basel. Although many geoscientists have seen such fold structures many times before, if you noticed the scale bar in th ...[Read More]

Imaggeo on Mondays: Foehn clouds

May 11, 2015

This week’s post is brought to you by Stefan Winkler, a Senior Lecturer in Quaternary Geology & Palaeoclimatology, who explains how the mountain tops of the Southern Alps become decorated by beautiful blanket-like cloud formations. The Sothern Alps of New Zealand are a geoscientifically dynamic environment in all aspects. They are arguably one of the youngest high mountain ranges in the ...[Read More]

Imaggeo on Mondays: The largest fresh water lake in world

March 2, 2015

Most lakes in the Northern hemisphere are formed through the erosive power of glaciers during the last Ice Age; but not all. Lake Baikal is pretty unique. For starters, it is the deepest fresh water lake in the world. This means it is the largest by volume too, holding a whopping 23,615.39 cubic kilometres of water. Its surface area isn’t quite so impressive, as it ranks as the 7th largest in the ...[Read More]

Imaggeo on Mondays: An explosive cloud

February 23, 2015
Imaggeo on Mondays: An explosive cloud
Karymsky volcano, 2004. Credit: Alexander Belousov (distributed via imaggeo.egu.eu)

One of the world’s most volcanically active regions is the Kamchatka Peninsula in eastern Russia. It is the subduction of the Pacific Plate under the Okhotsk microplate (belonging to the large North America Plate) which drives the volcanic and seismic hazard in this remote area. The surface expression of the subduction zone is the 2100 km long Kuril-Kamchatka volcanic arc: a chain of volcanic isla ...[Read More]