Volcano Watch: Grimsvotn, a large explosive volcano in Iceland is now under an increased alert level, following an earthquake swarm and releasing a glacial flood. The volcano was already near an eruption, creating an aviation risk from an ash cloud release into the North Atlantic region.

Volcano Watch: Grimsvotn, a large explosive volcano in Iceland is now under an increased alert level, following an earthquake swarm and releasing a glacial flood. The volcano was already near an eruption, creating an aviation risk from an ash cloud release into the North Atlantic region.