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Kilauea Volcano Eruption background

“The eruption in Kilauea’s middle east rift zone started with a fissure eruption on January 3, 1983, and has continued since at Pu`u `O`o Cone, or from vents within a few kilometers to the east or west, with few interruptions. In early August, 2011, the Pu`u `O`o crater floor collapsed to a depth of about 75 m (245 ft) below the east rim of the crater as lava burst from vents on the lower west flank of the cone. A DI tilt event several days later cut off supply to Pu`u `O`o and the west flank vents; lava reappeared in Pu`u `O`o Crater on August 21st and filled it to overflowing. A fissure eruption on the upper east flank of Pu`u `O`o Cone on Sept. 21, 2011, drained the lava lakes and fed a lava flow that advanced southeast through the abandoned Royal Gardens subdivision to the ocean within Hawai`i Volcanoes National Park in early December. The entry has been inactive since late December and the flows have been weakly active since mid-January. In general, activity waxes with inflation and wanes with deflation.”

Hawaii Volcano National Park
http://volcanoes.usgs.gov/hvo/activity/kilaueastatus.php