Rocks within the Earth are constantly being subjected to forces that bend, twist, and fracture them, causing them to change shape and size. This process is known as deformation. Polyphase deformation occurs over time when rocks are affected, or stressed, by more than one phase of deformation. Geomorphologist Amirhossein Mojtahedzadeh captured this stunning scene whilst on field work. “This p ...[Read More]
Imaggeo on Mondays: On the edge of an ice crevasse
Glaciers are persistent bodies of ice at least 100,000 square metres in area and 50 metres thick. They are mostly found in the polar regions but also in mountain ranges, and represent the largest reservoir of freshwater on Earth. This photo was taken by Zervas Efthimios in August 2009, on the climb towards Lenin Peak in the Pamir mountains, Central Asia. “This crevasse appeared just before ...[Read More]
Following today’s earthquake in Sumatra online
This blogpost is a round-up of potentially useful weblinks to information about the earthquake off the west coast of northern Sumatra of 11 April 2012. The links provided here are external and do not reflect the opinions of the European Geosciences Union. Regarding the earthquake, the US Geological Survey’s (USGS) Earthquake Harzard Program homepage features seismic activity maps and a summ ...[Read More]
Seismic Spring, part 4: The fieldwork finale – starting the journey home!
As the Arctic wakes up from its polar night, Dr Adam Booth is leading a team of UK geophysicists on a two-week campaign of seismic investigations on Storglaciären, a mountain glacier in northern Sweden. He will be reporting on the expedition in a series of posts published here in GeoLog. This is his fourth and final post. If you haven’t already done so, be sure to check out his first, second ...[Read More]