HONOLULU (AP) -- Molten lava and rocks went flying through the air on Hawaii's Kilauea (kih-luh-WAY'-uh) volcano after an explosion caused by the partial collapse of a crater wall.
The U.S. Geological Survey's Hawaiian Volcano Observatory says the collapse Sunday triggered a small explosion, spreading lava and debris around the rim of the crater.
The explosion happened on Kilauea's Halemaumau (hah-LE'-mah-oo-mah-oo) Crater.
Video of the event shows a wall of rocks falling into a lava lake that has been rising over the past week. The USGS says fist-size chunks of rock were thrown onto the closed Halemaumau visitor overlook.
The area has been closed since 2008 when the lava lake formed, and no one was injured.
A magnitude 3.6 earthquake was felt in the area early Monday morning, according to the USGS.