Fissure 8 Tephra Cone Changes Shape Through Time

The U.S. Geological Survey released this animated GIF on Monday, June 25, 2018.

This animated gif shows the fissure 8 tephra (cinder and spatter) cone morphology changes between June 15 and 24, 2018.

During this time a shoulder grew on the channel side of the cone as the vent shifted from being two distinct fountains to three, then to a single source of voluminous roiling. The cone height is about 154 feet from the hardened lava surface on which it was built.