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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Image: Kilauea Lava Flow
April 28, 2010

Kilauea Lava Flow

Zoomed-in view of the current visitor viewing area at the end of Hwy 130.

Image: Kilauea Lava Flow
April 28, 2010

Kilauea Lava Flow

View looking south at the currently active flow crossing the coastal plain west of Kalapana. The new flow is the silvery lava crossing the photo from lower right to top center where the flow front is burning vegetation. The end of Hwy 130 is visible at upper left.

April 8, 2010

Lava surface deep within Halema`uma`u

movie shows the lava surface deep within the Halema`uma`u vent cavity, captured with a thermal camera that can see through the thick fume. The lava surface is about 70 meters (230 ft) wide, and remains about 200 meters (660 ft) below the cavity rim. The surface is mostly crusted, with a slow migration from north to south. Small spattering sources occasionally break through

Image: Kilauea Flow Field
March 12, 2010

Kilauea Flow Field

No surface flows were active anywhere on the flow field today, due to summit deflation and a reduction in lava supply over the past few days. Summit inflation resumed yesterday, and an increase in lava supply should lead to resumed breakouts over the next several days. This photo shows the area of flows that were active over the past week—they can be identified as the

March 11, 2010

Active lava pond deep with the Halema`uma`u vent cavity

movie shows the active lava pond deep within the Halema`uma`u vent cavity. The lava is upwelling at the northern margin of the pond (the upper margin in this view), and slowly migrating south towards the bottom of the image, where it sinks out of view. The pond is about 50 m wide. Small spattering sources appear and disappear occasionally. This video was taken with a

Image: Lava flow
January 19, 2010

Lava flow

The terminus of the more vigorous western branch of the active flow on the western side of the TEB flow field near the top of the Royal Gardens subdivision.

Image: Kilauea's east rift zone eruption site
January 19, 2010

Kilauea's east rift zone eruption site

Kīlauea's east rift zone eruption site. Pu`u `Ō `ō is to the right, and the TEB vent and upper tube system is to the left and behind Pu`u `Ō `ō.

January 13, 2010

Entire floor of the Halema`uma`u vent

movie shows video collected with a thermal camera during two helicopter overflights of the Halema`uma`u vent. The high vantage point allowed a view of the entire floor of the vent cavity, which is not possible from the ground. Also, the thermal camera can "see" through the thick fume that normally obscures the vent to the naked eye. The first half of the video shows

December 28, 2009

Draining event in the lava pond within the Halema`uma`u vent

movie shows a draining event in the lava pond within the Halema`uma`u vent cavity. The lava column exhibited cycles of filling and draining of the vent cavity, with each cycle lasting a few minutes. As the pond drains, lava cascades into a small hole on the east side (right) of the cavity floor. Also, lava that was covering a large bench to the west of the main pond drains

December 21, 2009

Filling and draining cycle event in the Halema`uma`u vent

Lava within the vent cavity in Halema`uma`u crater continues to be active, and occasionally displays remarkable filling and draining cycles. This Quicktime movie shows the draining portion of one of these cycles, captured in "nightshot" mode in order to see through the thick fume. The video begins with a wide surface of chaotic, agitated lava, with vigorous upwelling and

Image: Aerial of Active Kilauea Area
December 17, 2009

Aerial of Active Kilauea Area

An aerial view looking north at two active areas of Kīlauea. Pu`u `Ō `ō crater is in the foreground, Mauna Loa (left) and Mauna Kea (right) are in the background. The fume source near the base of Mauna Loa (at Kīlauea's summit) is from the Halema`uma`u Overlook vent. The wind is blowing the plume trace toward the northeast, partially obscuring the view of Mauna Kea.

Image: Explosive Kilauea Boulder
December 8, 2009

Explosive Kilauea Boulder

This large rock at the Kīlauea Overlook in Hawai‘i Volcanoes National Park was ejected ballistically in 1790, or soon thereafter, from Kilauea Volcano's summit caldera when it was more than 600 meters (2000 feet) deep.

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

Valentines Day treat; lava below the road

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?

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 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.