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.

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November 5, 1998

The terrible tragedy in Nicaragua and Honduras from Hurricane Mitch's extraordinary rainfall was made worse by a volcano. The volcano didn't erupt, and it isn't even listed separately among the 1,511 volcanoes known to have been active in the past 10,000 years. 

October 29, 1998

Every day, tourists and locals visit Kolekole stream to see 70 cubic meters of water per second (18,000 gallons per minute or gpm) cascade 135 m (442 feet) over Akaka Falls to the plunge pool below. The sight can be both dramatic and serene.

October 25, 1998

Early Sunday morning shoppers at the Volcano farmers market can purchase delicious greenhouse tomatoes grown in Mountain View. In a cool mauka (inland) environment, the greenhouse provides the essential warmth that tomatoes require.

October 15, 1998

The major part of each Hawaiian volcano lies below sea level, which creates a logistical nightmare: How does one study the submarine slopes?

October 8, 1998

Scientists know more about the history and inner dynamics of Kīlauea than they do about most other volcanoes in the world. Yet a major portion of the volcano has received little attention.

October 1, 1998

A 1,262-m-deep (4,139-ft-deep) research hole was drilled in the southwest corner of Kīlauea's caldera in 1973. At the time, this was the deepest hole in the summit region of any active volcano on earth.

September 21, 1998

Kīlauea Volcano's summit has been slowly subsiding since 1983, the year that the ongoing Pu`u O`o-Kupaianaha eruption started. This broad and gentle cone-shaped downwarping of the summit is centered about 1,500 m (one mile) south of Halema`uma`u Crater, where the ground's surface is now 1.3 m (4.3 ft) lower than it was in 1983.

September 17, 1998

With this article, "Volcano Watch" broadens its scope to include items of biological interest related to Hawai`i volcanoes. Once every two months, the column will focus on topics that relate to the interplay of biological resources with volcanic activity. 

September 10, 1998

Rapid landscape changes take place during Kīlauea's east rift zone eruption. Visitors to the coastal plain six months ago could have watched lava spilling from tubes at two major ocean entries south of Royal Gardens. By July 11, the eastern entry, at Waha`ula, had ceased. 

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.