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January 17, 2011

Explosive Eruption (Jan 17, 2011)

Movie of the January 17 collapse and explosive eruption captured by a Webcam located on the rim of Halema‘uma‘u directly above the erupting vent.

Two color photographs, one showing a clear-day rock-wall face and one showing the rock-wall face obscured by volcanic gases.
December 31, 2010

Side-by-side comparison of the northwest wall of Kīlauea Caldera

Side-by-side comparison of the northwest wall of Kīlauea Caldera on a clear day (left) and a day with thick vog (right). HVO observation tower and building can be seen near the center in each photo

Image: Monitoring Gas Emissions from Kilauea Volcano
November 10, 2010

Monitoring Gas Emissions from Kilauea Volcano

Sulfur dioxide gas emissions from the crater of Pu‘u ‘Ō ‘ō on Kīlauea’s east rift zone and the vent within Halema‘uma‘u Crater at Kīlauea’s summit create volcanic pollution that affects the air quality of downwind communities.  Here, a USGS Hawaiian Volcano Observatory gas geochemist measures Pu‘u ‘Ō‘ō gas emissions using an instrument that detects gas compositions on the

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Aerial photograph of Laysan Island, Hawaii
July 24, 2010

Aerial photograph of Laysan Island, Hawaii

An aerial photograph of Laysan Island, Hawaii, part of the Papahanaumokuakea Marine National Monument.

Image: Kilauea Lava FLows Advance Toward Kalapana
July 23, 2010

Kilauea Lava FLows Advance Toward Kalapana

In July 2010, lava erupted from Kilauea Volcano's east rift zone burned vegetation on the coastal plain as active flows advanced toward Kalapana Gardens, the same area inundated by lava flows in 1990. Two homes in the subdivision were destroyed by lava in 2010 -- one in July and one in November.

Mauna Loa rumbled and stretched as it awakened from a 25-year slumb...
July 16, 2010

Mauna Loa rumbled and stretched as it awakened from a 25-year slumber

On July 6, 1975, eruptive fissures opened along Mauna Loa

Mauna Loa rumbled and stretched as it awakened from a 25-year slumb...
July 16, 2010

Mauna Loa rumbled and stretched as it awakened from a 25-year slumber

Lava fountains up to 20 m (65 ft) high erupted from fissures on the north flank of Mauna Loa early Sunday morning, July 6, 1975. USGS photo.

Image: Kilauea July 2007 Eruption Flow (Map)
July 14, 2010

Kilauea July 2007 Eruption Flow (Map)

Map showing the extent of the July 2007 eruption flow field relative to surrounding communities. Light red is the extent of the July 2007 eruption flow field. Reddish-brown is the extent of the currently-active Quarry flow as of July 8, 2010, while bright red shows the flow field expansion of the Quarry flow mapped by HVO geologists between July 8 and 14. Flows erupted

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Image: Looking Southeast Along Kilauea TEB Tube System
July 1, 2010

Looking Southeast Along Kilauea TEB Tube System

View looking southeast along the fuming trace of the TEB tube system. The growing rootless shield field is in the background just above and to the left of center frame. The low, rounded shape of the shields--especially the shield in shadow to the left--are evident in this photo.

1940 was a momentous year for Mauna Loa - and for Thomas A. Jaggar ...
June 11, 2010

1941 was a momentous year for Mauna Loa - and for Thomas A. Jaggar

Lava fountains erupt from a fissure in the southwestern part of Moku`aeoweo, Mauna Loa's summit caldera, on April 11, 1940 (view looking to the south-southeast). Patches of white snow cling to the caldera walls as fluid pahoehoe lava flows spread across

Kīlauea plume: now you see it, now you don't...
June 11, 2010

Kīlauea plume: now you see it, now you don't

Kīlauea volcano's summit eruption plume as viewed from the southeast flank of Mauna Loa on 11/30/2009 (top) and 12/20/2009 (bottom). The eruption plume's visible appearance is a complex function of physical eruptive vent conditions, meteorology and atmosp

Petrologic Monitoring of Kīlauea Volcano: An update for "Rockhounds...
June 2, 2010

Petrologic Monitoring of Kīlauea: An update for "Rockhounds"

An HVO geologist samples lava from an active lava tube. These samples are analyzed routinely to track changes in lava chemistry.