Thríhnúkagígur, a dormant volcano near Reykjavík, is the only known site on Earth where visitors can descend into an emptied magma chamber. Its last eruption 4,500 years ago left a vast, vividly ...

Thríhnúkagígur is a volcano near Reykjavík in Iceland with an empty magma chamber decorated with vivid colors that scientists ...

“To witness these powerful forces, the roar of Earth, is mind blowing,” says Ingimundur Stefansson, an Icelandic tour guide. “Man is a small potato in such a world.” In part because of our fascination ...

A powerful swarm of earthquakes in January suggested one of Iceland’s giant “ice volcanoes” may be awakening after a decade of slumber. In the months that followed, more earthquakes have rocked the ...