Images

This 1891 map shows much of the saddle between Mauna Kea (at top of map) and Mauna Loa. Lava flows depicted as black irregular shapes in the lower half of the map were erupted from Mauna Loa, with labeled ages ranging from "ancient" to 1881.

This satellite image was captured on Tuesday, June 23, 2015 by the Landsat 8 satellite. Although this is a false-color image, the color map has been chosen to mimic what the human eye would expect to see. Bright red pixels depict areas of very high temperatures and show active lava. White areas are clouds.

Earthquakes beneath Mauna Loa's summit prior to 1975 and 1984 eruptions. Green circles 0-5 km (0-3 mi) deep, red circles 5-10 km (3-10 mi) deep.

This map shows recent changes to Kīlauea's active East Rift Zone lava flow field. The area of the flow on June 4 is shown in pink, while widening and advancement of the flow as of June 19 is shown in red. Pu‘u ‘Ō‘ō lava flows erupted prior to June 27, 2014, are shown in gray.

Scattered breakouts were active at the margins of the June 27th flow, with only minor expansion of the flow margins over the past two weeks. This photo shows an active breakout on the south margin of the June 27th flow, moving over older ‘A‘ā from Pu‘u ‘Ō‘ō.

Scattered breakouts remain active northeast of Pu‘u ‘Ō‘ō on the June 27th lava flow, but have not advanced significantly over the past month. This photo shows the farthest reach of active lava on the flow field today, which was about 8 km (5 miles) northeast of the vent on Pu‘u ‘Ō‘ō. Minor brush fires were active where lava was entering forest.

This photograph shows the south margin of the June 27th flow, northeast of Pu‘u ‘Ō‘ō, where many small scattered breakouts were active. The active, and recently active, breakouts are visible at the light gray areas.

This map overlays a georeferenced thermal image mosaic onto the flow field change map above and shows the distribution of active and recently active breakouts. The thermal images were collected during a helicopter overflight of the flow field today (June 19). The June 27th flow is outlined in green to highlight the flow margin.

Little has changed in Pu‘u ‘Ō‘ō over the past month, and a small lava pond still exists within the circular pit in the western portion of the crater. This pit can be seen through the fume in this photo, and a tiny area of incandescence at the edge of the active pond is barely visible.

Looking southwest across the surface of Halema‘uma‘u lava lake on January 23, 1918. Jagged "crags" of stranded, solidified lava rise as much as 30 m (100 ft) above the surface of the lake. A natural levee separates the smooth surface of the active lava lake from overflows of pāhoehoe in foreground. Photo by Thomas A. Jaggar, Jr.

Research geologist Carl Thornber leads a group of Mount St. Helens National Volcanic Monument interpretive rangers and volunteers along the boardwalk at the Trail of Two Forests, explaining the formation of lava tubes and tree molds from the 1900-year-old Cave Basalt Flow on the south side of Mount St. Helens.

A UV camera measuring SO2 emissions from the 2009 dome of Redoubt Volcano, June 13, 2015.

Sam Johnson explaining details of the Hosgri fault zone at USGS offices in Santa Cruz.

Geophysicist Sam Johnson explaining details of the San Andreas fault zone at USGS offices in Santa Cruz.

One month ago the summit lava lake was at the rim of the Overlook crater (the small crater in the center of the photo), spilling lava onto the floor of Halema‘uma‘u Crater (the larger crater that fills much of the photo), creating the dark flows surrounding the Overlook crater.

This small-scale map shows Kīlauea's active East Rift Zone lava flow in relation to lower Puna. The area of the flow on May 21 is shown in pink, while widening and advancement of the flow as of June 4 is shown in red.

This map shows recent changes to Kīlauea's active East Rift Zone lava flow field. The area of the flow on May 21 is shown in pink, while widening and advancement of the flow as of June 4 is shown in red. Pu‘u ‘Ō‘ō lava flows erupted prior to June 27, 2014, are shown in gray.

Activity at Pu‘u ‘Ō‘ō remains relatively steady. This photograph looks towards the southwest, and shows outgassing from numerous areas in Pu‘u ‘Ō‘ō crater. On the far side of the crater, the small circular pit (right of center) had a small lava pond that was too deep to see from this angle.

Recent lava on the June 27th flow cascaded over the overhanging rim of this collapse pit on an earlier portion of the flow field.

Scattered breakouts remain active northeast of Pu‘u ‘Ō‘ō. On today's overflight, breakouts were active as far as 8 km (5 miles) northeast of Pu‘u ‘Ō‘ō. Some of this activity was at the forest boundary, burning vegetation.

Halema‘uma‘u Crater, looking west. The dark area on the crater floor consists of recent overflows from the Overlook crater. The Overlook crater is near the left edge of the photo, and a portion of the active lava lake surface can be seen below the rim.