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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January 28, 1999

Reggie and the Hawaiian Volcano Observatory were inextricably associated for 34 years. I was privileged to be part of the relationship for much of this time.

January 21, 1999

One of the most striking aspects of a newly formed lava flow is its barren and sterile nature. The process of colonization of such flows by plants and animals is called primary succession, and it is also found on other newly formed surfaces such as glacial deposits, large landslides, and river deposits.

January 14, 1999

Here's a quiz for all you volcano junkies: What's the second highest volcano in North America? Hint—it was named by the Aztecs and has been erupting on-and-off for the last four years. If you guessed Popocatepetl, you pass, and if you can pronounce it, go to the head of the class!

January 7, 1999

Kīlauea has been erupting for more than 16 years. Is this an exceptionally long time for an eruption to last? The answer is yes, but there have certainly been longer eruptions during human history—much longer.

December 31, 1998

Today is the 16th anniversary of the ongoing Pu`u `O`o-Kupaianaha eruption of Kīlauea Volcano. Lava has erupted from vents located on Kīlauea's east rift zone since January 3, 1983.

December 24, 1998

When you visit the coast to watch lava pour into the sea, do you ever wonder where the lava came from and what path it took to the surface? We earth scientists do.

December 17, 1998

Last week, four members of the U.S. Geological Survey's Hawaiian Volcano Observatory attended the annual fall meeting of the American Geophysical Union (AGU) in San Francisco. AGU has a membership of more than 35,000 scientists from 115 countries, and 8,275 of the members attended this meeting.

December 11, 1998

At a recent public meeting, the State of Hawai`i outlined a proposal to locate a new, approximately 2,300-bed medium-security correctional facility 10 km (6 mi) downslope from the existing, approximately 100-bed minimum-security correctional facility.

December 3, 1998

Scientists have learned a lot about the on-land part of Kīlauea's east rift zone, but little is known about its underwater part, the Puna Ridge. A research cruise late in September and October was the first to explore the ridge in detail.

November 26, 1998

Hawai`i is one of the most extensively studied volcanic regions in the world. However, there is still very little known about the processes that take place deep underneath a volcano in what geologists casually call the "plumbing system." 

November 19, 1998

One of the most useful gadgets in the geologist's tool box is the ability to measure the age of a lava flow, an island, or even the earth itself.

November 12, 1998

Lava and the surf—two powerful forces seeking supremacy over each other. One consequence of this battle is "floating rocks" seen near the ocean entry, where lava from Kīlauea's ongoing eruption reaches the south shore of the Big Island.