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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January 14, 2003

Lava pouring from inflating flow

Same sheet of lava pouring from inflating flow but seen from different angle.

January 7, 2003

Channeled cascade on Paliuli

Channeled cascade on Paliuli. Other videos on this day focus on front of this cascade. Wind noise in this and other clips is obvious, but listen for sounds of pieces of crust scraping against one another or across ground. For scale, flow front in all clips is 1-1.5 m high.

January 7, 2003

Fluid lava leaks from inside crusted front of cascade

Fluid lava leaks from inside crusted front of cascade.

January 7, 2003

More disruption of slabby flow front

More disruption of slabby flow front.

January 7, 2003

More disruption of slabby flow front

More disruption of slabby flow front.

Image: Hawaiian Coot (Fulica alai)
January 1, 2003

Hawaiian Coot (Fulica alai)

Hawaiian Coot swimming in a wetland marsh. Listed as an endangered species in 1970. Dark gray with a white bill and frontal shield that varies from white, pale buff, and pale blue to deep red.

Image: Waterfall, Maui, Hawaii
December 31, 2002

Waterfall, Maui, Hawaii

Waterfall, Maui, Hawaii.

December 27, 2002

Lava pours down pre1995 sea cliff

Lava pours down pre1995 sea cliff. See stills above for more information. Note large file size. Warning: turn down your sound; lots of wind noise.

December 12, 2002

PubTalk 12/2002 — Hawai`i's Volcanoes—Never a Dull Moment

20 Years of Eruption at Kilauea and Waiting for Mauna Loa

by Don Swanson,Volcanologist, Hawaiian Volcano Observatory


  • Kilauea's Pu'u O'o-Kupaianaha eruption, which began on January 3, 1983, is already the volcano's longest rift eruption in at least 600 years
  • Lava has destroyed 8 miles of highway and 189
August 10, 2002

Close-up of lava falls and steam cloud

Close-up of lava falls and steam cloud generated by lava entering water.

August 10, 2002

Lava falling over sea cliff

Lava falling over sea cliff into water at western group of entries.

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May 18, 2000

Mosquitoes are not native to the Hawaiian Islands. Anyone driven away from an outdoor activity or rudely awakened by a biting mosquito would agree that the islands of old were indeed a paradise. 

May 11, 2000

May 18th marks the 20th anniversary of the catastrophic eruption of Mount St. Helens that laid waste to over 540 square km (200 sq mi) of forest, killing 57 people and countless wildlife. Hundreds of kilometers away in eastern Washington, as much as 5 cm (2 in) of ash fell, closing the interstate highway from Seattle to Spokane for a week and paralyzing air traffic.

May 4, 2000

Kīlauea is a magnet to volcanologists, visitors, and television production companies alike, drawn from around the word by the spell of its eruptions. Kīlauea is also of great interest to those who cannot travel here to see it firsthand. So, it is reasonable that HVO should work with TV crews to bring the Kīlauea story into tens of millions of homes on all continents.

April 27, 2000

Mauna Loa Volcano last erupted 1984. Lava flows from vents in its northeast rift zone reached within seven kilometers (four miles) of Hilo. When and from where will it erupt next?

April 20, 2000

The topics for this article are presented in response to requests from our readers. Many weeks ago, a reader called to express her appreciation for the "Volcano Watch" column and asked if we would write about the Steaming Flats in Hawai`i Volcanoes National Park.

April 13, 2000

A house burst into flames on Thursday afternoon, April 6, when it was overrun by lava. This house, at the foot of the Royal Gardens subdivision, is the latest of 182 structures to be destroyed by the ongoing eruption along Kīlauea's east rift zone. It's the first such loss since October 1991.

April 6, 2000

On March 31, Hawai`i Volcanoes National Park officially opened Kulanaokuaiki campground, a barrier-free facility along the Hilina Pali Road south of Kīlauea's caldera. The new campground replaces the Kipuka Nene picnic area, 2 km (1.2 miles) farther southwest, which is now closed to protect Hawai`i's state bird.

March 30, 2000

With the east rift zone eruption of Kīlauea continuing into its 18th year, much of our focus in volcano and seismic monitoring at the Hawaiian Volcano Observatory is on Kīlauea. At the same time, however, Mauna Loa receives a lot of our attention, and it should never be overlooked in terms of the hazards that it poses to us.

March 23, 2000

Which way would you drive if you lived on the on the flank of an active volcano with lava headed your way? This question is based on real-life events that happened during the 1950 eruption of Mauna Loa.

March 16, 2000

The home of over 5 million breeding seabirds, Laysan Island is an uninhabited Hawaiian atoll formed from coral deposits atop a 20 million-year-old submerged volcano. Today the highest point of what was once "Laysan Mountain" is only about 12 meters (40 feet) above sea level, and a person can walk the perimeter in about 3 hours. 

Block ejected from the summit of Mauna Loa volcano less than 1,000 ...
March 15, 2000

An under-appreciated and poorly understood aspect of Mauna Loa's eruptive activity is the presence of explosion debris on the east and west sides of the summit caldera.

March 9, 2000

Large and colorful flames sometimes play from vents on Kīlauea volcano. These flames, which range from yellowish orange to greenish blue and reach as high as 1 m (3 ft), result from hydrogen gas burning in air. Hydrogen is normally a minor constituent of volcanic gases.