Before that , the most noticeable was during April 2007 , when the lava flow was estimated at 3,000,000 cubic metres ( 3,900,000 cu yd ) per day .
( 10 ) Before that , the most noticeable was during April 2007 , when the lava flow was estimated at 3,000,000 cubic metres ( 3,900,000 cu yd ) per day .