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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September 8, 1995

The 15 volcanoes that comprise the eight principal Hawaiian Islands are the youngest in a linear chain of about 125 volcanoes that stretches for about 3,600 miles across the north Pacific.

September 1, 1995

The long-lived eruption on Kīlauea's East Rift Zone took a short break starting Tuesday, August 22. Before the pause in activity, we observed that the lava pond inside Pu'u 'O'o Crater was unusually deep (more than 310 feet below the rim).

August 25, 1995

A recent visitor to the Hawaiian Volcano Observatory was involved with the removal of abandoned vehicles from the area surrounding the Sand Hill cone in coastal Puna. He was puzzled by the location of an apparent volcanic vent so far away from the rift zone of Kīlauea.

August 18, 1995

The rapidly changing geology in the Hawaiian Islands has profound consequences for the plants and animals in Hawai'i on several time scales.

August 11, 1995

The eruption on Kīlauea's East Rift Zone continues with little change. Lava is erupting from two vents located on the south and west flanks of the Pu'u 'O'o cone. 

August 4, 1995

The mission of the U.S. Geological Survey's Hawaiian Volcano Observatory is to monitor the volcanoes of Hawaii, to study the geological processes associated with eruptive and seismic activities, and to inform the public of the results of our studies.

July 28, 1995

Soufriere Hills Volcano on the island of Montserrat in the Caribbean became active on July 18, 1995. This is the first eruption of the volcano in historic time.

July 21, 1995

For several weeks we have been fielding calls from anxious people in Kona asking about an imminent eruption of Hualālai Volcano.

Measuring how volcanoes move with satellites...
July 14, 1995

Last week we discussed the different land surveying techniques HVO scientists use to monitor the swelling and movement of active volcanoes.

July 7, 1995

The ground around an active volcano swells, deflates, or shifts as magma moves in and out of the volcano's underground plumbing system. The distribution and rate of ground deformation provides clues about processes occurring within the volcano.

June 30, 1995

Hawaii is a land of rugged beauty and untamed natural forces swathed in a beguiling gentleness that is unmatched anywhere else on Earth.

June 23, 1995

The formation of new islands invariably sparks the imagination. On June 6th a submarine eruption began at Metis Shoal in the Tonga Islands. A passing ship confirmed that an eruption was continuing on June 9th.