Unified Interior Regions


The Pacific Region has nine USGS Science Centers in California, Nevada, and Hawaii. The Regional Office, headquartered in Sacramento, provides Center oversight and support, facilitates internal and external collaborations, and works to further USGS strategic science directions.

States L2 Landing Page Tabs

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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

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

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

1940 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

June 11, 2010

Action within Pu`u `Ō `ō crater

movie shows video taken during today's field visit and overflight. The first portion of the video is taken at the rim of Pu`u `Ō `ō crater, and shows the north vent feeding the lava pond. The lava surface undulates due to rising gas bubbles, and a small overturn is triggered. The second portion of the video shows an open stream of lava at the summit of one of the rootless

June 3, 2010

Active lava pond within Pu`u `Ō `ō crater

movie shows the active lava pond within Pu`u `Ō `ō crater, imaged with a thermal camera. The video is shown at x60 speed, and covers about 25 minutes. Lava is being supplied to the crater from two vents, one visible in the upper right corner of the image and one out of view in the lower left. Crustal foundering events, in which a section of the thin surface crust ruptures

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.

June 1, 2010

Looking into the Halema`uma`u vent cavity

video from a thermal camera looking into the vent cavity at Halema`uma`u around 3pm today. The video is shown at x4 speed. At the beginning of the clip, the lava level is at a high stand, with slowly migrating crustal plates and little spattering. Eventually, small scale spattering begins in the northeast corner of the pond, accompanied by vigorous degassing. As the

View of lava lake in Overlook vent, Halema‘uma‘u Crater, Kīlauea Vo...
June 1, 2010

View of lava lake in Overlook vent, Halema‘uma‘u, Kīlauea

This photo shows the view into Overlook vent during a relatively high level of the lava lake in 2010. When the lava was at a high stand like this, the plume became very thin and a view of the lava lake was possible. Typically, the fume was too thick to view the lava surface with the naked eye, and HVO geologists then relied on thermal cameras to image the lava surface.

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Map of lava-flow field, Kilauea Volcano
May 16, 2003

Map of flows from Pu`u `O`o: 16 May 2003

photo of lava
May 16, 2003

Breakouts in Kohola under Full Flower Moon

Eruption cloud, from the east crater of Anatahan Volcano
May 15, 2003

For the past week, a billowing column of dark volcanic ash has been erupting from Anatahan Volcano in the Northern Mariana Islands, burying parts of the volcano with more than 45 cm (18 inches) of ash and sending a dilute eruption cloud more than 1000 km (600 miles) to the west.

photo of lava
May 9, 2003

Tiny hornitos at Son of Cookie Monster

Map with lava inundation zones identified for Mauna Loa
May 8, 2003

The primary goal of the U.S. Geological Survey's Hawaiʻian Volcano Observatory is to provide scientific information that can be used to reduce risks due to volcanic activity. To this end, the Observatory assesses volcanic hazards and educates the public and public officials about those hazards.

April 24, 2003

April 26, 2003, marks the 30th anniversary of the magnitude M6.2 Honomu earthquake. This earthquake occurred at 10:26 a. m. and was centered north of Hilo, beneath the town of Honomu. The earthquake caused nearly $6 million in damage, to roads and highways, lifelines and utilities, and over 400 homes and businesses.

photo of lava
April 19, 2003

Kohola breakout 880 m north of coconut grove