GeoLog

satellite imagery

Cyclone Idai disaster: European agencies foresee climate danger but poor countries stumble.

January 22, 2021
Cyclone Idai disaster: European agencies foresee climate danger but poor countries stumble.
Summer on the Northern Hemisphere. Credit: Maximilian Reuter (distributed via imaggeo.egu.eu)

Cyclone Idai, which was labelled by the UN as possibly the worst climate calamity to ever hit the Southern Hemisphere, pounded Beira, Mozambique, in March 2019. The European Space Agency images revealed that a huge new inland ´lake´ measuring about 80 miles by 15 miles, an area the size of the European state of Luxembourg, had suddenly been created by  the catastrophe. However, millions of residen ...[Read More]

Imaggeo On Monday: Watercolors- Nature’s talent

July 20, 2020
Imaggeo On Monday: Watercolors- Nature’s talent
Watercolors- Nature's talent. Credit: Diana Bejan (distributed via imaggeo.egu.eu)

The photo was taken from the International Space Station (ISS), approx. 400 km above the Earth, in the educational project administered by NASA: Sally Ride EarthKAM, Mission 59, November 2017. The image was requested by a team of students from my college, coordinated by me. Even though we weren’t there, on ISS, to trigger the camera, all the locations in which the photographs were taken are ...[Read More]

Geosciences Column: A new rock outcrop map and area estimation for the entire Antarctic continent

September 9, 2016
Geosciences Column: A new rock outcrop map and area estimation for the entire Antarctic continent
Whale bones, raised beaches and moraine, Byers Peninsula, Antarctica . Credit: Marc Oliva (distributed via imaggeo.egu.eu)

Antarctica has been known as “the frozen continent” for almost as long as we have known of its existence. It may be the only place on Earth where, instead of information on the extent of glaciers or ice caps, there exists a dataset of all non-icy areas compiled from satellite imagery. However, this repository is far from perfect: while satellite resolution and coverage have been steadily improving ...[Read More]

Geosciences Column: An international effort to understand the hazard risk posed by Nepal’s 2015 Gorkha earthquake

February 12, 2016
Geosciences Column: An international effort to understand the hazard risk posed by Nepal’s 2015 Gorkha earthquake
The upper part of the Pokhara Valley and view towards the Annapurna Massif. Debris flows and floods triggered by three major medieval earthquakes delivered the vast, flat-lying and steeply dissected deposits of the Pokhara Formation. The photo was taken by Amelie Stolle. Distributed via NASA Goddard on Flickr.

Nine months ago the ground in Nepal shook, and it shook hard: on April 25th 2015 the M7.8 Gorkha earthquake struck and was followed by some 250 aftershocks, five of which were greater than M 6.0. The devastation left behind in the aftermath of such an event, and how to coordinate disaster-relief efforts in a vast, mountainous region, is difficult to imagine. Yet, this December at the 2015 AGU Fall ...[Read More]