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 3, 1998

The Chain of Craters marks the location of Kīlauea's upper east rift zone. The chain reaches southeastward from the summit caldera and then gradually bends into the overall east-northeast trend of the rift zone. 

August 27, 1998

You hear a low rumbling sound; the walls of your house shake a little; objects on the shelves skip around, maybe even fall off the shelf. Was that an earthquake?

August 20, 1998

Groups of students of all ages frequently visit the U.S. Geological Survey's Hawaiian Volcano Observatory while they are on an excursion to Hawaii Volcanoes National Park. When prior arrangements are made, we escort them around our facilities and give a short talk on our mission and program.

August 13, 1998

Geology is an inexact science, and sometimes studying volcanoes seems like a game of chance. This is particularly true for those who study the way lava flows.

August 6, 1998

In 1790 a group of Hawaiian warriors in the Ka`u Desert was killed by an eruption of hot gas and flying rocks that originated from Kīlauea caldera. Scientists have studied the layers of tephra visible in gullies along the southwest rift zone in Hawai`i Volcanoes National Park and have concluded that this event was the only major explosion of the last 2000 years.

July 30, 1998

The mission of the U.S. Geological Survey's Hawaiian Volcano Observatory (HVO) is to monitor the volcanoes of Hawai`i, to study the geological processes associated with eruptive and seismic activities, and to inform the public of the potential geologic hazards associated with volcanoes.

July 23, 1998

Although the study of volcanoes is, in itself, fascinating and is more than a full-time job, volcanologists also work closely with researchers in other sciences. One of the things we contribute to the work of other scientists is the ages of the lava flows around the island.

July 16, 1998

In a recent national television program on tsunami, attention was focused on the Great Crack in the southwest rift zone of Kīlauea. The size of the crack was presented as evidence that the south flank was breaking away from the island. 

July 10, 1998

Eruption Continues and New Land Frequently Collapses

July 9, 1998

When lava enters the sea, it begins a struggle to build new land. We name these entries for nearby geographic features—Lae`apuki, Kamoamoa, Kamokuna, Waha`ula, to list a few. For a brief time they become places memorable to anyone who visits and watches the spectacle of incandescent lava, immense steam plumes, and spattering explosions. That's how entries begin, but how do they end?

July 2, 1998

It has been more than 18 years since Mount St. Helens had its powerful eruption, almost 12 years since its latest quiet dome-building eruption, and 8 years since its latest small explosions. But this length of time is just a wink of the eye to a volcano.