A 15th fissure brought more lava to the Leilani Estates subdivision of Puna, Hawaii, on May 9, the same day that the USGS warned of an increased risk of explosive activity at the summit of the Kilauea volcano.At least 36 structures have been destroyed by lava flows since a May 4 earthquake rocked the area, Hawaii Tribune Herald reported. Credit: Mick Kalber/Paradise Helicopters via Storyful