Pu‘u‘ō‘ō crater floor subsiding on March 5, 2011
After an intrusion on March 5, Pu‘u‘ō‘ō crater floor subsided for several hours. Hot incandescent crater walls were exposed as the floor dropped a total of 113 m (371 ft). Frequent rockfalls into the crater triggered red ash plumes. USGS photo taken by T. Orr on March 5, 2011, at 4:32 p.m.