Lava from the East Rift Zone entering the sea near Kalapana (Hawaii Big Island). Image by Martin Mergili, distributed by EGU under a Creative Commons License. The image shows a flow of basaltic lava out of a lava tunnel into the sea. The location of the scene is the shoreline of Hawaii Big Island near the village of Kalapana. Flow direction of the lava is from the bottom to the top of the image, v ...[Read More]
Geosciences Column: Iceland spar, or how Vikings used sunstones to navigate
Nowadays, we can rely on GPS receivers or magnetic compasses to tell us how to reach our destination. Some 1000 years ago, Vikings had none of these advanced navigation tools. Yet, they successfully sailed from Scandinavia to America in near-polar regions where it can be hard to use the Sun and the stars as a compass. Clouds or fog and the long twilights characteristic of polar summers complicate ...[Read More]
Imaggeo on Mondays: Stretching to the Light
Stretching to the Lights, Bryce Canyon, Utah, USA. Image by Valeria Volpe, distributed by EGU under a Creative Commons License. Imaggeo is the online open access geosciences image repository of the European Geosciences Union. Every geoscientist who is an amateur photographer (but also other people) can submit their images to this repository. Being open access, it can be used by scientists for thei ...[Read More]
Imaggeo on Mondays: Akutan Volcano, Alaska
Akutan Volcano, Alaska. Image by Michael Jackson, distributed by EGU under a Creative Commons License. High winds create lenticular clouds off Shishaldin Volcano in the Aleutian Islands. UNAVCO staff installed 16 integrated geophysical instruments including GPS, seismic, tilt, meteorologic instruments on Unimak Island as part of the EarthScope Project. Imaggeo is the online open access geosciences ...[Read More]
Imaggeo on Mondays: Mother of Pearl Cloud
Mother of Pearl Cloud above Esrange, Sweden. Image by Peggy Achtert, distributed by EGU under a Creative Commons License. This image shows a Polar Stratospheric Cloud (PSC) observed during a lidar campaign at Esrange, northern Sweden, on January 27th, 2011. The lidar measurement revealed that the PSC occurred between 29 and 31 km altitude at a temperature below -93°C. PSCs are most commonly observ ...[Read More]
Imaggeo on Mondays: Alpine Wetland
High Altitude Wetland in the Alps, Switzerland. Image by Christine Schleupner, distributed by EGU under a Creative Commons License. High altitude wetlands are scenic and unique ecosystems that fulfill important hydrological functions and provide many ecosystem services. They also serve as geo-archives and play a role in greenhouse-gas emissions, just to name a few things. The photograph has been t ...[Read More]
Imaggeo on Mondays: Oasis Valley
Oasis Valley, Nevada, USA. Image by Jean-Daniel Champagnac, distributed by EGU under a Creative Commons License. This picture has been taken from the air (small plane) during fieldwork in Alaska during 2009. Oasis valley is located between frontal lobes of Fan and Bremner glaciers (143.57°W; 60.87°N). The orange colour is from sand that have been brought in by the glaciers, and carved by rivers. I ...[Read More]
Imaggeo on Mondays: Tethys Himalaya
Tethys Himalaya in Zanskar, Jammu & Kashmir. Image by Pierre Dèzes, distributed by EGU under a Creative Commons License. Tethys Himalaya are one of the zones of the Central Himalayan Domain (CHD), which is one of the tectonic zones of the Himalaya. The Tethys Himalaya is approximately 100 km wide large fold (syncline) with superimposed smaller folds (this is known as a synclinorium). The Tethy ...[Read More]
Imaggeo on Mondays: Mya Lake
Mya lake in the Beaufortain, French Alps. Image by Sandrine Tacon, distributed by EGU under a Creative Commons License. Imaggeo is the online open access geosciences image repository of the European Geosciences Union. Every geoscientist who is an amateur photographer (but also other people) can submit their images to this repository. Being open access, it can be used by scientists for their presen ...[Read More]
Imaggeo on Mondays: Waterworld
Modern coral reefs surround an island formed from a dacitic dyke, part of the Pliocene volcanic rocks of Ambon, Moluccas, Indonesia. Image by Ian Watkinson, distributed by EGU under a Creative Commons License. Imaggeo is the online open access geosciences image repository of the European Geosciences Union. Every geoscientist who is an amateur photographer (but also other people) can submit their i ...[Read More]