Iceland sits astride the boundary between the Eurasian and North American Tectonic Plates, explaining the island's earthquakes and volcanic activity.
Below is a photograph on the Irish Times website
I found this on National Geographic:
Volcanic Chain Reaction?
Photograph by Hans Strand, Corbis
Not far from Eyjafjallajokull glacier, the much larger Mýrdalsjökull glacier (satellite map) hides the fiery, gently sloping Katla volcano that lies under the ice.
Considered one of Iceland's most dangerous volcanoes, Katla last erupted in 1918 and could be roused by the nearby rumblings that began over the weekend, scientists warned Monday.
"Historically, we know of three eruptions in Katla linked to eruptions in Eyjafjallajokull," Magnús Tumi Gudmundsson, a professor of geophysics and civil-protection adviser, told the AFP news service. For now, though, the giant's sleep appears undisturbed.
Published February 19, 2010