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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July 3, 2009

Halema`uma`u showing spattering, sloshing at the ponded lava surface

movie shows a source of minor spattering at the margin of the ponded lava surface within the Halema`uma`u cavity. Weak sloshing of the lava surface can be seen around the spattering source.

June 30, 2009

Lava surface within the cavity of Halema`uma`u

movie shows the lava surface within the cavity at Halema`uma`u. Keeping an eye on the lower left portion of the screen, one can see a large rock impacting the lava surface. This impact appears to trigger degassing and overturning that migrates across a large portion of the lava surface.

Early morning glow from Overlook vent in Halema‘uma‘u Crater, Kīlau...
June 29, 2009

Early morning glow from Overlook vent in Halema‘uma‘u, Kīlauea

Incandescence from the lava lake surface (out of view) reflects an awesome glow on the gas plume rising from the lake surface.

June 25, 2009

Halema`uma`u crusted lava surface and occasional spatter

movie shows activity of the lava surface deep within the Halema`uma`u cavity. The crusted lava surface is moving slowly from northeast to southwest, with occasional bursts of spatter from the margins and cracks. The first half of the movie is shown at actual speed, with the second half shown at x10 speed to convey the sense of movement and illustrate the oscillations of

June 22, 2009

'Nightshot' mode of Halema`uma`u crusted and sluggish

movie shows the lava surface within the Halema`uma`u cavity, again using 'nightshot' mode to see through the fume. The lava surface this evening was considerably more crusted and sluggish than on previous nights, and had risen a minor amount compared to much of last week. The lava migrates from the top of screen towards the bottom, with occasional bubble bursts disrupting

June 17, 2009

'Nightshot' mode movie of Halema`uma`u rolling lava surface

movie shows the roiling lava surface within the cavity in Halema`uma`u. The video was captured in 'nightshot' mode in order to see through the fume, which obscured viewing by the naked eye. Vigorous upwelling occurs in the northeast (upper right) corner of the opening, with the southwest corner consisting of passively sloshing, and partly crusted lava.

June 13, 2009

Halema`uma`u lava lake draining event

movie shows a draining event in the Halema`uma`u lava lake. Filling and draining cycles have been observed before here, but this video is one of the clearest examples thus far. The video is shown at actual speed, with draining taking about 40 seconds. Note the draining is highly unsteady, and proceeds in a step-wise fashion. These cycles of filling and draining are due to

June 4, 2009

Another rare look into Halema`uma`u crater

video shows another rare view of the active lava surface deep within the cavity in Halema`uma`u crater. The lava is approximately 100 m below the floor of Halema`uma`u. The lava surface is disrupted by waves, splashes, bubbling and upwelling, with overall lava movement from the upper right to the lower left.

June 3, 2009

Halema`uma`u crater

movie shows the behavior of the active lava at the base of the cavity in Halema`uma`u crater. Lava emerged in the upper right and flowed towards the lower left. The surface was disrupted by a chaos of waves, splashes, bubble bursts and spattering. The video is shown at actual speed.

Image: Hawaiian Hoary Bat
May 31, 2009

Hawaiian Hoary Bat

A Hawaiian Hoary fits in the palm of one's hand.

Image: Lava Enters The Ocean At Kilauea Volcano, Hawai'i
May 7, 2009

Lava Enters The Ocean At Kilauea Volcano, Hawai'i

Lava from the Pu'u 'Ō'ō-Kupaianaha eruption, active since 1983, enters the ocean on the south flank of Kīlauea Volcano.

March 30, 2009

Halema`uma`u vent with thermal camera

movie shows recent activity observed within the Halema`uma`u vent with a thermal camera. The video speed is approximately x30. Cycles of filling and draining of the lava lake have been observed throughout much of the past week, following a collapse in the vent on March 25. Filling-draining frequencies have ranged from about 10 to 20 cycles per hour. A brief period of

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Lava oozing seaward. Ocean visible in background
February 14, 2003

Valentines Day treat; lava below the road

Workers moved visitor hut and restrooms
February 13, 2003

Lava very near road...and then on the road

Lava stream flowing against tumulus
February 13, 2003

Videos of lava flow advancing rather quickly across grassland

February 13, 2003

Hawai`i is often described as the ideal setting for studying active volcanic processes. After all, where else can you find a "drive in" volcano that provides all the amenities that volcanologists want: hot fresh lava; swelling, quaking ground; and the delicate fragrance of sulfurous fumes emanating from abundant fissures and vents?

February 6, 2003

Little more than a mile down the Chain of Craters Road from Crater Rim Drive, a large tract of bare ground suddenly appears on the right, and curious travelers wonder why it is so open. But there's no place to stop, so they move on, and the Puhimau thermal area is quickly forgotten.