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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April 11, 2003

Lava moving along east edge of breakout near ahu

Lava moving along east edge of breakout near ahu. Width of view, about 1 m.

April 11, 2003

Lava at front of breakout

Lava at front of breakout moves into and burns dead shrubbery. Width of view, about 2 m.

March 28, 2003

Lava moves rapidly from under crust

Lava moves rapidly from under crust of inflating flow and finally disappears under overhang. Length of flowing toe, about 1 m.

March 15, 2003

Lava breaks out of inflated toe

Lava breaks out of inflated toe and moves down moderate slope with rolling motion, top faster than bottom. See still images for this day; sagging rope gives scale.

March 15, 2003

Continued movement of lava across rope barrier

Continued movement of lava across rope barrier. Muffled sounds of a long-lasting, migrating methane explosion can be heard about two-thirds of the way through the clip, followed by a "Wow."

March 15, 2003

Lava moves across rope

Broad toe of lava moves across rope that formed barrier for access to Wilipe`a lava delta.

March 6, 2003

Lava moving rapidly

Toe of lava moving fairly rapidly down moderate slope along edge of Kohola flow. Note that lava moves more rapidly at top than at base of toe, in contrast to lava in video for March 1, which was moving across nearly flat ground. Note also developing wrinkles in moving crust.

March 6, 2003

Lava burning bush

Lava moving down rather steep slope and burning bush at snout of stream. Width of burning bush, about 1 m.

March 1, 2003

Lava flow advancing

Details of flow advance shown in 25-second clip. Lava oozes outward from base of flow, picks up loose flakes of crust (1-3 cm across) on ground surface, and lifts them up as flow thickens. This is how material once on ground surface gets onto top of flow. This is a common mode of advance of lava on nearly flat slope. Note: This is a large file because of its

February 18, 2003

Cascade and lava falls on west edge of Kohola ocean entry

Cascade and lava falls on west edge of Kohola ocean entry, falling over sea cliff about 8 m high. Turn down your sound; lots of wind noise.

February 18, 2003

Broad cascade and falls

Part of broad cascade and falls that suddenly gushed from under crust at top of sea cliff. Turn down your sound; lots of wind noise.

February 18, 2003

Lava Cascade

Base of lava cascade and construction of mound on beach below sea cliff. Turn down your sound; lots of wind noise.

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January 4, 2001

Watching lava flow across the ground surface and into the ocean can be mesmerizing and exciting-the experience of a lifetime. Don't let it be the last experience of your lifetime. Here are tips on how to return to your car unbloodied and upright.

December 28, 2000

By anyone's reckoning, New Year's Day either starts a new millennium or ends its first year. What have Hawai`i's four active island volcanoes done during the past 1,000 years?

December 21, 2000

For the past two weeks, numerous reports of increased seismic activity heralding a possible large eruption at Popocatepetl Volcano in Mexico have been in the news. A disturbing commentary in the reports was that residents living on the slopes of the volcano were hesitant to comply with the government's order to evacuate.

December 14, 2000

It's been 60 years since Harold Stearns first recognized that Hawaiian island volcanoes evolve through stages we call shield, postshield, and rejuvenated volcanism.

December 7, 2000

Two months ago, we discussed early findings suggesting that Kīlauea had an explosive eruption far larger than we dared think. The study has progressed since then, and the early findings have been confirmed and extended.

November 30, 2000

Last week we wrote about the large Kalapana earthquake of 1975. In the article we discussed the importance of repeated geodetic observations that monitored the accumulation of strain before the earthquake and allowed HVO researchers to forecast the event.

November 23, 2000

Wednesday, November 29, 2000, will mark the 25th anniversary of the magnitude 7.2 Kalapana earthquake that struck the Puna and Ka'u districts of Hawai'i County. The 1975 earthquake is the second largest ever documented in Hawai'i, overshadowed only by the 1868 great Ka'u earthquake, which has been estimated to be of magnitude 7.9.

November 16, 2000

The Kalij Pheasant is an unparalleled success among game birds introduced in the 50th State. Because Hawai`i has no native upland game birds, people have imported a total of twelve species of pheasants, quail, partridges, peafowl, and wild turkeys from all over the world. Last to arrive was the Kalij, released in 1962 at Pu`u Wa`awa`a Ranch.

November 9, 2000

Anyone who has been close to an active flow or steam vent knows that the heat coming from one of these features is intense and, at times, overwhelming! It will come as no surprise, then, that thermal monitoring of volcanoes and their products plays an important part in volcanology.

November 3, 2000

Kīlauea has been erupting for nearly 18 years, and there is no sign of it stopping anytime soon. But all previous Kīlauea eruptions ended, and there's no reason to think this one is any different. What can we expect when the curtain finally falls?

October 26, 2000

To many of us, Hawaiian volcanoes loom sleepily overhead, occasionally stirring from their slumber and oozing lava flows down their flanks toward the sea. Deep within the towering volcanoes, however, lies the potential for powerful explosions of volcanic ash and blocks.

October 19, 2000

Driving along the Queen Ka`ahumanu highway from Kailua-Kona to Waikoloa, one passes a vast expanse of well-exposed lava rock. These flows are from Hualālai and Mauna Loa Volcanoes and are of various ages. If you slow down and look carefully, you are able to recognize individual flows by their distinctive surface texture, color, or luster.