Images

USGS topographers making an electronic distance measurement in a dry lake bed in Saline Valley in Death Valley, California.

USGS topographer running a traverse in the Alabama Hills near Mt. Whitney, California.

USGS topographer identifying a mine on a photograph in Death Valley.

USGS topographer with plane table and alidade in the Alabama Hills near Mt. Whitney, California.

USGS topographer using a Topcon Guppy in the dunes of Saline Valley in Death Valley, California

USGS topographers doing a helicopter photo reconnaissance in Saline Valley in Death Valley, California.

Low fountain, approximately 50 meters high, from Pu'u 'O'o on Hawai'i Island's Kilauea Volcano (viewed from the north). Lava issuing from the breach in the northeast rim of the crater produced an 'a'a flow that extended more than 4 kilometers. Eruption episode 8.

Pu'u 'O'o fountain approximately 100 meters high during eruption episode 8 on Hawai'i Island's Kilauea Volcano. Dark clots of spatter land near the base of the fountain, contributing to the growth of the cone. Less dense cinder, visible in the upper right, is carried downwind of the cone.

Accretionary lava ball comes to rest on the grass after rolling off the top of an 'a'a flow in Royal Gardens subdivision on Hawai'i Island's Kilauea Volcano. Accretionary lava balls form as viscous lava is molded around a core of already-soldified lava.

View at dusk of the young Pu'u 'O'o cinder-and-spatter cone, with fountain 40 meters high, on Hawai'i Island's Kilauea Volcano (episode 5).

Arching fountain of lava approximately 10 meters high issuing from the western end of the 0740 vents, a series of spatter cones 170 meters long, south of Pu'u Kahaualea on Hawai'i Island's Kilauea Volcano (episode 2). Episodes 2 and 3 were characterized by spatter and cinder cones, such as Pu'u Halulu, which was 60 meters high by episode 3.

Forest of lava trees resulting from eruption of a 1-km-line of vents east of Pu'u Kahaulea on Hawai'i Island's Kilauea Volcano. The bulbous top of each lava tree marks the high stand of the lava flow as it spread through the trees.

The September 25, 1982, Kaluapele eruption was a brief but vigorous event that followed nearly two hours of seismic unrest and rapid summit inflation. Lava erupted from a 1,150-foot-long fissure near the southern end of the caldera, producing fountains up to 220 feet high.

The April 30, 1982, Kaluapele eruption was a short-lived summit event that lasted about 19 hours. Lava erupted from a 3,200-foot-long fissure northeast of Halemaʻumaʻu crater, producing low fountains 15–30 feet high, with bursts up to 160 feet.

USGS geologists gathered samples by hand from vents on the dome and crater floor. Additionally, sulfur dioxide gas was measured from a specially equipped airplane before, during, and after eruptions to determine "emission rates" for the volcano.

Photo 15 of 15: Water level in sinkhole chimney stabilized since the previous day. View to south across the sinhole.

Photo 13 of 15: Water level in sinkhole chimney continued to rise. View to east across the sinkhole. (6 p.m.)

Photo 14 of 15: Remnants of community pool in sinkhole. View to east across the sinkhole.

Photo 7 of 15: Cars in a sinkhole. Auto mechanic’s garage starting to collapse into sinkhole. View to south across the sinkhole.

Photo 4 of 15: House within the sinkhole. View to north across the sinkhole.

Photo 9 of 15: Community pool collapsing into sinkhole at. Pool was roughly Olympic-sized and was about half full at the time of collapse. Impressive sounds of the rebar and concrete snapping, then the rush of water. View to north across the sinkhole. (1:30 p.m)