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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Kīlauea lower East Rift Zone lava flows and fissures, June 19, 1:00...
June 19, 2018

Kīlauea LERZ lava flows and fissures, June 19, 1:00 p.m.

Map as of 1:00 p.m. HST, June 19, 2018. Given the dynamic nature of Kīlauea's lower East Rift Zone eruption, with changing vent locations, fissures starting and stopping, and varying rates of lava effusion, map details shown here are accurate as of the date/time noted. Shaded purple areas indicate lava flows erupted in 1840, 1955, 1960, and 2014-2015.

Geology field crews on the ground near the Kīlauea's fissure 8 midd...
June 19, 2018

Geology field crews on the ground near Kīlauea's fissure 8 midday o...

Geology field crews on the ground near the Kīlauea's fissure 8 midday on June 19, 2018 observed a still-vigorous channelized lava flow being fed by lava fountains at the vent. Standing waves are visible within the channel. Cascades/rapids are visible near the base of the cone, which is an estimated 50 m (164 ft) high. The maximum flow velocity in the channel is 7.7 m/s (17

June 18, 2018

Kīlauea Volcano — Weak Plume at Halem`uma`u (webcam)

On June 18, 2018, at 6:13 AM, a seismic event occurred at Halema‘uma‘u that produced a relatively ash-poor gas 

animated gif of radar images showing slumping at the crater over time
June 18, 2018

Kīlauea Volcano — Satellite Radar (Continued Slumping)

This animated GIF shows a sequence of radar amplitude images that were acquired by the Agenzia Spaziale Italiana CosmoSkyMed satellite system. The images illustrate changes to the 

Lava fountaining at night time.
June 18, 2018

Kīlauea Volcano —

Fissure 8 lava fountains obscured by a longer exposure photograph taken early morning on June 18. The incandescent spots along a horizontal line mark the edge of the 

View of a crater with many cracks from slumping
June 18, 2018

Kīlauea Volcano — Halema‘uma‘u Crater (June 18, 2018)

Halema‘uma‘u viewed toward the west during the June 18 helicopter overflight. HVO and Jaggar Museum can barely be seen on the caldera rim in the upper right of the photograph.

June 18, 2018

Kīlauea Volcano — Halema`uma`u Crater (with HVO)

During the helicopter overflight on June 18, crews captured this image of the growing Halema‘uma‘u crater viewed to the southeast. With HVO and Jagger Museum sitting on the caldera rim (right side, middle where the road bends to the left) it is easier to comprehend the scale of

Animated GIF showing lava flowing out of a fissure
June 18, 2018

Kīlauea Volcano — Lava Flow (GIF)

An animated GIF showing lava bubbling out of fissure 8 at Kīlauea Volcano, Hawaii. Clip is taken from the full b-roll video listed as the source.

Aerial view of fissure 6
June 18, 2018

Kīlauea Volcano — Fissure 6

Fissure 6 (photo center) showed signs of activity overnight, producing small amounts of spatter and feeding short lava flows. Fissure 6 is located about 2.2 km (1.4 mi) downrift from Fissure 8.

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Thermal image shows crack across lava delta...
June 22, 2017

Thermal image shows crack across lava delta

Active surface breakouts continue near the 61g vent...
June 21, 2017

Active surface breakouts continue near the 61g vent

No visible breakouts on the coastal plain...
June 16, 2017

No visible breakouts on the coastal plain

HVO's masked geologist heads north to Alaska...
June 15, 2017

Tim Orr accepted a research geology position at the Alaska Volcano Observatory (AVO) in Anchorage, so he's headed north to Alaska. 

Latest upgrade of seismic stations at Kīlauea summit completed...
June 8, 2017

Field engineers at the USGS Hawaiian Volcano Observatory (HVO) recently completed a multi-year effort to upgrade a subset of seismic stations at the summit of Kīlauea Volcano.

A view of the northern Overlook crater wall, through passing fume. ...
June 4, 2017

Different textures on the surface of the summit lava lake

Tracking the latest moves of Kīlauea and Mauna Loa...
June 1, 2017

On the Island of Hawai‘i, deformation is measured primarily with three techniques: tiltmeters, GPS (Global Positioning System), and InSAR (Interferometric Synthetic Aperture Radar).

This video clip shows HVO geologist Tim Orr sampling lava from an a...
May 31, 2017

Hawaiian Volcano Observatory and Jaggar Museum

Numerous fumaroles are present near the rim of Halema‘uma‘u Crater,...
May 28, 2017

Spattering on summit lava lake and Pele's hair around Halema‘uma‘u

A close up of one of the typical pāhoehoe toes. ...
May 27, 2017

Sluggish breakouts near the base of the pali

Volcanoes, Landslides, and Angry Gods—A Pacific Northwest Connectio...
May 25, 2017

Both volcanoes and landslides are important for landscape evolution in Hawaii and worldwide. In Washington State, an old legend makes the connection between them.

The March 5 breakout of the 61g flow is producing active surface fl...
May 23, 2017

61g flow is active at the Kamokuna ocean entry and at the base of the pali