Those are satellite photographs of the Eyjafjallajökull volcano, in visible (left) and infrared (right) light. According to the New York Times, you pronounce the volcane's name:
The “EY” rhymes with the word “bay.” The “k” is softer than an English “k,” almost like a hard “g.” And the “t” at the end kind of sticks for a second and pulls away with a hint of a glottal “l.”
EY-ya-fyat-lah-YOH-kuhtOr you can refer to it as, you know, that volcano over there, in Iceland. That generally works, too.
Thank you to the NASA Jet Propulsion Laboratory at the California Institute of Technology for the stunning images.