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

Filter Total Items: 299
Pu‘u ‘Ō‘ō...
September 22, 2011

Map showing the current configuration of Pu‘u ‘Ō‘ō.

Kīlauea East Rift Zone Eruption Map...
September 22, 2011

Map showing the extent of lava flows erupted during Kīlauea's ongoing east rift zone eruption.

Kamoamoa Eruption...
March 9, 2011

Map showing the extent of the active flows of the Kamoamoa eruption, which started on March 5, 2011.

Image: July 2007 Eruption--Quarry flow near-view map: July 27, 2010
February 4, 2011

Map showing a close-up view of flow field expansion over the past few days.

July 2007 Eruption—Flow Field Map...
February 4, 2011

Map showing the extent of the "July 2007 eruption", or Episode 58, flow field relative to surrounding communities.

Halema‘uma‘u Vent Map...
February 1, 2010

Map showing the location of the Halemaʻumaʻu Overlook vent, and subsequent closures due to the eruption.

Aerial view of Pu‘u ‘Ō‘ō and vicinity...
November 1, 2009

Aerial view of Puʻu ʻŌʻō and surrounding features. 

Episode 56 Map (with Seismicity)...
June 20, 2007

Map shows activity from Episode 56.

Map of flows from Pu‘u ‘Ō‘ō: September 12, 2003...
September 12, 2003

Map shows lava flows erupted during 1983-present activity of Pu‘u ‘Ō‘ō and Kupaianaha. Red colors, both dark and light, denote Mother's Day flow, which began erupting on May 12, 2002 and continues to the present. The darkest color represents flows active since January 21, 2003.

Pu‘u ‘Ō‘ō cone and surroundings as of July 2000...
July 1, 2000

Pu‘u ‘Ō‘ō cone and surroundings as of July 2000, showing the area covered (mauve color) by lava since February 1997 during episode 55. Inside the crater of Pu‘u ‘Ō‘ō, the "trough" is the drained lava pond of September–October 1999. The central portion of the trough was briefly filled with lava in February 2000.

Pu‘u ‘Ō‘ō cone and surroundings as of March 2000...
March 1, 2000

Pu‘u ‘Ō‘ō cone and surroundings as of March 2000 showing the area covered (dark gray) by lava since February 1997 during episode 55. Inside the crater of Pu‘u ‘Ō‘ō, the "trough" is the drained lava pond of September–October 1999.

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Geologist looks at fissure 8 through a camera
June 25, 2018

Kīlauea Volcano — Documenting Fissure 8 Activity

USGS Hawaiian Volcano Observatory geology field crews maintain watch over the eruptive activity in the lower East Rift Zone and at Kīlauea's summit. Here, a geologist documents the behavior of lava as it exits the Fissure 8 cone. Lava enters the upper channel traveling as fast as 30 km/hour (18 mi/hour).

Photograph of USGS UAS pilot wearing an orange USGS shirt
June 25, 2018

Woods Hole's Aerial Imaging and Mapping pilots in Hawaii

Woods Hole Coastal and Marine Science Center's Aerial Imaging and Mapping rock stars preparing to fly Unmanned Aerial Systems (UAS) mission while a river of lava flows in the background

Small plume cloud from a crater
June 24, 2018

Kīlauea Volcano — Small Halema`uma`u Eruption (June 24, 2018)

On June 24 a small ash-poor steam plume rose above the Halema‘uma‘u crater rim following another collapse explosion event at 4:12 p.m. HST (image taken at 4:27 p.m.).

Kīlauea summit subsides and produces frequent earthquakes...
June 24, 2018

Kīlauea summit subsides and produces frequent earthquakes

On June 23, 2018 at 4:32 p.m. HST after approximately 17 hours of elevated seismicity, a collapse explosion occurred at the summit if Kīlauea. The energy released by the event was equivalent to a magnitude 5.3 earthquake. During the intense shaking, rockfalls cascaded down the northern margin of the caldera wall just below Uēkahuna Bluff sending rock dust into the air.

June 24, 2018

Kīlauea Volcano — Ever-Growing Halema`uma`u Crater

A UAS (Unoccupied Aircraft Systems) mission on June 24, 2018, filmed details of the dramatic changes occurring within Halema‘uma‘u crater at Kīlauea's summit since explosive eruptionsof 

subsidence shown as an animation
June 24, 2018

Kīlauea Volcano — Animated GIF of Crater Subsidence

This animated GIF shows a timelapse sequence consisting of one image per day between June 13 and 24. The photos were taken from the southern caldera

Aerial view of lava channel
June 24, 2018

Kīlauea Volcano — Ocean Entry

Lava is entering the sea on the southern side of the entry area primarily through the open channel, but also along a 1 km (0.6 mi) wide area. The entry areas are marked by billowing laze plumes. The interaction of lava with the ocean creates "laze", a corrosive seawater 

Lava flowing across the landscape
June 24, 2018

Kīlauea Volcano — Lava Flows from Fissure 8

View to the southwest, looking "up" the lava channel. Lava flows from Fissure 8 (not pictured) through the open channel about 13 km (8 mi) to the ocean. Lava remains incandescent (glowing orange) along the entire length of the channel with sections of cooled lava (black) on the surface. The dark areas in the lower portion of the image are parts of the early lava flow from

Lava fountain with lava flow
June 24, 2018

Kīlauea Volcano — Fissure 8 Fountain

At fissure 8, fountains provide a vigorous supply of lava that exits the cinder cone and drops over a spillway to enter a well-established 

Geologist pointing into the distance along a road with a straight roadway beside him.
June 24, 2018

Kīlauea Volcano — Roadway Crack Observations

USGS field crews track activity in and around Leilani Estates in Kīlauea Volcano's lower East Rift Zone. Observations are also collected on a daily basis from cracks in the area of Highway 130, shown here (no changes in temperature, crack width, or gas emissions have been noted recently).

Lava spattering from a cone
June 24, 2018

Kīlauea Volcano — Spatter Cone (Fissure 8)

The spatter cone at fissure 8 is now about 55 m (180 ft) tall. 

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Mauna Loa update: unrest continues, but the outcome is uncertain...
September 14, 2017

What's up with Mauna Loa, and is any change in sight?

Wispy fumes provided a clear view of the western wall of the Overlo...
September 13, 2017

Continued spattering in the summit lava lake

HVO K2cam image at the time of the 6:06 p.m. collapse on Sept. 8. ...
September 8, 2017

Collapses common during significant drops in summit lava lake

When you need information about Hawaiian volcanoes, turn to the USG...
September 7, 2017

For information about Hawaiian volcanoes, a good place to start is the U.S. Geological Survey (USGS). Between its websites and publications, abundant resources are at your disposal.

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