Images

Numerous small streams of lava were entering the water as they were battered by the surf.

Channel system at Coldwater Lake outlet revealed after alder trees drop leaves, South Coldwater Creek, Mount St. Helens, southeast view to Johnston Ridge.

At around 7:30 a.m. HST, Rock-fall scar near the right edge at Halema‘uma‘u. Half an hour later, the black streak was no longer visible.

Mount Hood in the not-so-far distance beyond downtown Portland, Oregon. Photograph taken at the top of the Portland Aerial Tram line on Marquam Hill.

A tumulus at Captain Jack's stronghold within Lava Beds National Monument .

Island of Hawai‘i map, showing Mauna Loa and the other four volcanoes that make up the island. Mauna Loa structural features include summit caldera, rift zones, radial vents, and historical lava flows.

Mount Hood dominates the skyline outside Portland, Oregon on a clear day. A major eruption of Mount Hood would pose a great hazard to the regional economy.

Volcanic Hazard Assessment for the Lassen Region, California is based upon a comprehensive investigation of the eruptive history and possible future eruption scenarios with associated volcanic hazards.

Map of Yellowstone National Park showing Brimstone Basin and other areas known to release carbon dioxide from the ground.

Ice Springs cinder cone and lava flow erupted 720 years ago in the Black Rock Desert Volcanic Field, Utah.

The east face of Middle Sister is 350 m (1150 ft) high. Ice-sculpted pile of lavas at right, variously called "Black Hump," "Prouty Point," or "Step Sister," has 190 m of relief and consists of at least five flows.

Aerial view of a lava tube trace (dark sinuous shape) along the ground surface at Medicine Lake Volcano, California.

Lassen Peak viewed from the south at the summit of Brokeoff Volcano, Lassen Volcanic National Park.

Summary of power system impacts following 12 historic eruptions.

Tephra-laden water filtering through the turbines has necessitated the replacement of four turbines in 21 years. The Agoyan Dam and its (orange) floodgates are designed to let highly turbid water bypass the turbines so as to avoid accelerated wear of generation components

Mount Hood looms above the Columbia River and Glenn Jackson Bridge. Excess sediment from eruptions of Mount Hood have choked the river and caused flooding in the past.

Mount St. Helens and the industrial waterfront area of North Portland, Oregon along the Willamette River in the foreground. Excess sediment from volcanoes can significantly impact river traffic.

"Stevens and Party at Kīlauea" - U.S. Minister Stevens is second from the right. Demosthenes Lycurgus and Alex Lancaster are first and second from the left, respectively.

This thermal image shows the scattered breakouts on the coastal plain and the ocean entry near Kupapa`u. In addition to these coastal plain flows, several breakouts were active near the top of the pali, around the northern boundary of Royal Gardens subdivision.

A closer view of the ocean entry, with weak plumes originating from several spots along the coast.

A small collapse this morning of the spatter cone that had built up around the northeast lava pond in Pu‘u ‘Ō‘ō resulted in a brief gush of lava onto the crater floor.