This Envisat Advanced Synthetic Aperture Radar interferogram over the Kenyan section of the Great Rift Valley shows small surface displacements that are not visible to the naked eye of the Longonot (front right). In the background is Suswa volcano, which was not deforming at this time. A group of scientists employed the technique known as SAR Interferometry (InSAR) – a sophisticated version of ‘spot the difference’ – on over a decade worth of radar images from ESA’s Envisat and ERS satellites to study volcanic activity in the Great Rift Valley, which extends through Africa from Mozambique to Djibouti. Read More
