Hawaii may be paradise for vacationers, but for geologists it has long been a puzzle. Plate tectonic theory readily explains the existence of volcanoes at boundaries where plates split apart or collide, but mid-plate volcanoes such as those that built the Hawaiian island chain have been harder to fit into the theory. A classic explanation, proposed nearly 40 years ago, has been that magma is supplied to the volcanoes from upwellings of hot rock, called mantle 'plumes,' that originate deep in the Earth's mantle. Evidence for these deep structures has been sketchy, however. Now, a sophisticated array of seismometers deployed on the sea floor around Hawaii has provided the first high-resolution seismic images of a mantle plume extending to depths of at least 1,500 kilometres (932 miles)...
- Hawaiian hot spot has deep rootsThu, 3 Dec 2009, 14:38:41 EST
- What goes down, must come up: Earth's leaky mantleWed, 27 May 2009, 13:45:07 EDT
- Lava fingerprinting reveals differences between Hawaii's twin volcanoesWed, 30 Nov 2011, 2:56:00 EST
- X-rays illuminate the origin of volcanic hotspotsWed, 18 Jul 2012, 21:05:37 EDT
- Fledgling mantle plume may be cause of African volcano's unique lavaFri, 13 Mar 2009, 11:31:07 EDT