Eyjafjallajökull Erupting on May 10, 2010

Eyjafjallajökull volcano in central south Iceland erupting on May 10, 2010. Photo from Wikimedia. (Sigmundsson et al., 2010) describe intrusion leading up to the eruption, (Gudmundsson et al., 2012) describe the ash generation and distribution, and a Wikipedia page descibes all of the observed eruption phases (Wikipedia). An excellent animation of the ash cloud spreading to Europe is found here.