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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View from MT cam

[MTcam] Mokuʻāweoweo Caldera Thermal from the Northwest Rim

This image is from a temporary thermal camera located on the north rim of Mauna Loa's summit caldera. The temperature scale is in degrees Celsius up to a maximum of 500 degrees (932 degrees Fahrenheit) for this camera model, and scales automatically based on the maximum and minimum temperatures on the caldera floor and not the whole frame, which sometimes results in the

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July 8, 1999

Visitors to the Big Island's southeast coast commonly see a steam plume, the telltale sign that Kīlauea's eruption is sending lava into the ocean.

July 1, 1999

Many readers know that the island of Hawai`i is made of five volcanoes—Kīlauea, Mauna Loa, Hualālai, Mauna Kea, and Kohala. 

June 24, 1999

Each summer, staff members of the Hawaiian Volcano Observatory have participated in student training programs with the University of Hawaii at Hilo (UHH). One of the programs on which HVO scientists have helped is the Rocks and Rolls volcanology session of Na Pua No`eau.

June 17, 1999

Two magnitude-4.4 earthquakes rocked the Big Island this month. The first occurred on June 3 and was located 13 km (7.8 mi) east of Waimea at a depth of 38.3 km (23 mi). The second was a week later on June 10 and was located 21.3 km (12.8 mi) southeast of Punalu`u at a depth of 52 km (31.2 mi).

June 10, 1999

If you ask volcanologists what the most dangerous part of their job is, they are likely to answer, "flying in helicopters."

June 3, 1999

Over the years HVO has attempted to maintain its scientific energy, enthusiasm, and insights by melding a permanent staff with a smaller cadre of rotating, research-oriented scientists. The observatory has about one rotating researcher for every four or five permanent staff. Rotating scientists generally stay 3-5 years.

May 27, 1999

Lava flows are one of the most common hazards produced by active volcanoes. Here in Hawai`i, they may endanger property but seldom endanger people's lives. 

May 20, 1999

"Wekiu" is the Hawaiian word for top or summit. This name was given to Mauna Kea's tallest cinder cone, which reaches 13,796 feet in elevation and is the highest in the Hawaiian archipelago. Life on the Mauna Kea summit must endure freezing temperatures, winter snow falls, and, occasionally, hurricane-force winds. 

May 18, 1999

A small population of the endangered Hawaiian bird, palila, is holding steady on the western slopes of Mauna Kea volcano.

May 13, 1999

May 18 marks the anniversary of the 1980 eruption of Mount St. Helens, which laid waste to over 520 square kilometers (200 square miles) of forest and killed 57 people.

May 6, 1999

The shaking was finally over. Lower Puna returned to normal following the calamitous episode of ground cracking and subsidence in April 1924. But it was only the calm before the storm.

April 29, 1999

As we enter the month of May, we are remiss in not remembering that April was "Tsunami Awareness Month". April was chosen as "Tsunami Awareness Month" because the deadliest tsunami to strike the Hawaiian Islands occurred on April 1, 1946. What is often overlooked is that the largest and deadliest locally generated tsunami also occurred in the month of April.