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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April 19, 2003

Lava moving rapidly at front of breakout

Lava moving rapidly at front of breakout 880 m north of coconut grove. Width of view, about 1.5 m.

April 11, 2003

Lava moving along east edge of breakout near ahu

Lava moving along east edge of breakout near ahu. Width of view, about 1 m.

April 11, 2003

Lava at front of breakout

Lava at front of breakout moves into and burns dead shrubbery. Width of view, about 2 m.

March 28, 2003

Lava moves rapidly from under crust

Lava moves rapidly from under crust of inflating flow and finally disappears under overhang. Length of flowing toe, about 1 m.

March 15, 2003

Lava moves across rope

Broad toe of lava moves across rope that formed barrier for access to Wilipe`a lava delta.

March 15, 2003

Lava breaks out of inflated toe

Lava breaks out of inflated toe and moves down moderate slope with rolling motion, top faster than bottom. See still images for this day; sagging rope gives scale.

March 15, 2003

Continued movement of lava across rope barrier

Continued movement of lava across rope barrier. Muffled sounds of a long-lasting, migrating methane explosion can be heard about two-thirds of the way through the clip, followed by a "Wow."

March 6, 2003

Lava moving rapidly

Toe of lava moving fairly rapidly down moderate slope along edge of Kohola flow. Note that lava moves more rapidly at top than at base of toe, in contrast to lava in video for March 1, which was moving across nearly flat ground. Note also developing wrinkles in moving crust.

March 6, 2003

Lava burning bush

Lava moving down rather steep slope and burning bush at snout of stream. Width of burning bush, about 1 m.

March 1, 2003

Lava flow advancing

Details of flow advance shown in 25-second clip. Lava oozes outward from base of flow, picks up loose flakes of crust (1-3 cm across) on ground surface, and lifts them up as flow thickens. This is how material once on ground surface gets onto top of flow. This is a common mode of advance of lava on nearly flat slope. Note: This is a large file because of its

February 18, 2003

Cascade and lava falls on west edge of Kohola ocean entry

Cascade and lava falls on west edge of Kohola ocean entry, falling over sea cliff about 8 m high. Turn down your sound; lots of wind noise.

February 18, 2003

Broad cascade and falls

Part of broad cascade and falls that suddenly gushed from under crust at top of sea cliff. Turn down your sound; lots of wind noise.

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September 29, 1995

In the last few weeks, we have reviewed the eruptive stages of Hawaiian volcanoes and have given brief overviews of the geologic history of Hawai'i Island and of Maui, Moloka'i, Lana'i, and Kaho'olawe, the islands that make up the Maui Complex.

September 23, 1995

Last week, we presented a brief history of the island of Hawaii, the largest island in the Hawaiian chain. However, before the island of Hawaii formed, Maui Nui was an even larger island. 

September 15, 1995

The Island of Hawai'i consists of five coalesced volcanoes, a submarine volcano that has already subsided below sea level, and another, Lō‘ihi Seamount, that has yet to grow to sea level.

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.