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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Lava entering the ocean through steam
July 9, 2018

Kīlauea Volcano — Lava Entering Ocean

Lava entering the ocean as seen through steam and rain early this morning.

Lava running past a residential area
July 9, 2018

Kīlauea Volcano — Fissure 8 and Leilani Estates

Fissure 8 and Leilani Estates viewed from the south. Houses in the foreground are located in the southern portion of Leilani Estates. Fissure 8 and surrounding 

Crusted over lava flow
July 9, 2018

Kīlauea Volcano — Lower Section of Fissure 8 Flow

The lower section of the fissure 8 lava channel appears to be almost completely crusted over, and the lava level in the channel was lower during this morning's

Rain over a lava flow area
July 9, 2018

Kīlauea Volcano — Rain at Leilani Estates

This photograph taken during this morning's overflight shows heavy, localized rain at 

Laze plumes
July 8, 2018

Kīlauea Volcano — Multiple Laze Plumes

Multiple ocean entries were active this early morning, each contributing to the prominent "laze" 

Aerial view over residential area
July 8, 2018

Kīlauea Volcano — Lava Near Cape Kumukahi

Lava still oozes from the northern edge of the ‘a‘ā flow near the lighthouse at Cape Kumukahi (upper right). Smoke from burning vegetation marks location of lava oozeouts. View is toward the northeast. 

Aerial of braided lava channel
July 8, 2018

Kīlauea Volcano — Braided Lava Channel

Braided section of the lava channel located "downstream" between about 3.5 to 6 km (2.2 to 3.7 mi) from fissure 8 (upper right). The width of the two channels in the middle center is about 325 m (1,065 ft). View is toward the southwest.

Aerial of lava flow
July 8, 2018

Kīlauea Volcano — Kapoho Crater

View of the partially filled Kapoho Crater (center) and the open lava channel where it makes a 90-degree turn around the crater. The open channel no longer directly enters the ocean. Lava flows freely through the channel only to the southern edge of Kapoho Crater (left side of image). Clearly, lava moves into and through the molten core of the thick ‘a‘ā flow across a

Lava channel
July 8, 2018

Kīlauea Volcano — Open-Ended Lava Channel

Close view of the "end" of the open lava channel where lava moves beneath the crusted ‘a‘ā flow.

animated GIF showing subsidence at a crater
July 8, 2018

Kīlauea Volcano — Animated GIF of Crater Subsidence

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 

Filter Total Items: 2,134
Telephoto view of some of the pāhoehoe lava channels from the surfa...
September 1, 2017

Activity continues at the Kamokuna ocean entry and along the 61g flow field

Tephra deposit names: out with the old, in with the new!...
August 31, 2017

The caldera was a dynamic place during the 300-plus years just before written history began at Kīlauea (in 1823), and the newly defined subdivisions of the Keanakāko‘i Tephra help us understand this energetic and dangerous time better than did the previous terminology.

Creative engineering helps HVO monitor Mauna Loa Volcano...
August 24, 2017

The USGS Hawaiian Volcano Observatory (HVO) has a long tradition of innovation when it comes to the tools that we use to monitor the status and activity of volcanoes.

At 9:35 pm HST on August 19, there was a large littoral explosion n...
August 21, 2017

Short-lived lava falls at Kamokuna ocean entry

The ongoing Pu‘u ‘Ō‘ō eruption is full of anniversaries...
August 17, 2017

The longest-lived and most voluminous rift-zone eruption of Kīlauea Volcano in more than 500 years—the ongoing Pu‘u ‘Ō‘ō eruption—began in January 1983, and is fast approaching its 35th anniversary.

Thermal Cameras Keep a Cool Eye on Hot Lava...
August 10, 2017

Thermal cameras have been used by volcanologists around the world for many years to study volcanic processes and search for signs of impending eruptions.

While mapping the flow margins, HVO geologists found an opening int...
August 9, 2017

Activity continues on the 61g flow field and at the ocean entry

Time-lapse sequence shows Halema‘uma‘u gas plume...
August 7, 2017

Time-lapse sequence shows Halema‘uma‘u gas plume

Lava cascades out of perched lava channel into lower channel, Pu‘u ...
August 3, 2017

Kīlauea has now passed the one-year anniversary of the episode 61g lava flow reaching the Pacific Ocean. But what was this busy volcano up to a decade ago?

On the coastal plain, the front of the June 26 breakout was stalled...
July 31, 2017

Kamokuna lava delta subsidence continues

Summit lava lake level continues dropping...
July 29, 2017

Summit lava lake level continues dropping