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USGS "Pu`u `O`o crater floor collapsed yesterday afternoon taking the lava lake with it; about 15 minutes after the start of the collapse, a high-volume lava flow issued from west flank vents on Pu`u `O`o Cone and flowed northwest and south along the west edge of previous flows.
Details are all found within the USGS/HVO updates
Also check out their two new webcams and images page
; links are found at the top of the update page.