Journal Highlights

Using Radar to Understand How Volcanic Eruptions Evolve

Research Spotlight—

Radar satellite imagery can be used to measure constructional changes in the topography of long-lived volcanoes, according to a new study of Ecuador’s El Reventador volcano.

The rate at which a volcano extrudes lava is a key variable for tracking changes in volcano behavior, magma supply, and potential hazards to people and property. Locally, lava extrusion can have variable effects, from small-scale doming to large-scale changes in a landscape due to lava flows. Accurately measuring these changes, however, is often difficult because of infrequent satellite observations and sparse ground-based measurements.

To overcome this challenge, Arnold et al. used high-resolution radar satellite imagery to investigate both ground deformation and constructional topographic changes at El Reventador, one of Ecuador’s most active volcanoes. Using data collected from two missions, the German Aerospace Center’s TerraSAR-X add-on for Digital Elevation Measurement (TanDEM-X) and the Canadian Space Agency’s RADARSAT-2, the team analyzed differences in surface roughness during the volcano’s most recent eruptive phase, which began in 2012. They then used these results to map the extent and thickness of 39 new lava flows, whose bulk volume (through 24 August 2016) they estimate to be 56 million cubic meters....more

-- Terri Cook, Freelance Writer,