Satellites Can Help Detect When a Volcano's About to Blow

Just as we can often spot the beginnings of an illness from a number of signs, there are symptoms of volcanic activity that can indicate a growing likelihood of eruption. Monitoring them can involve detecting surface changes and small earthquakes caused by the movement of magma inside a volcano, or measuring changes in gases emitted from vents. Signs like these are used to raise alerts and trigger evacuations, and they have saved lives. But they aren’t always perfect. More

(Source: WIRED - Mar 19)