Global Volcanism Program | Image GVP-11296
A large 4 x 7 x 35 m block from a lava flow was transported about 900 m within a pyroclastic flow down the NE flank of Arenal on 5 September 2003. The flows were produced by lava flow fronts collapsing, descending to about 800 m elevation. Geologist Erick Fernandez from OVSICORI-UNA measures the dimensions of the block.
Photo by Eliecer Duarte, 2003 (OVSICORI-UNA).