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.

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Low lava fountains from 1984 Mauna Loa "2,900-m vents" signaled dec...
April 8, 1984

Low lava fountains from 1984 Mauna Loa "2,900-m vents" signaled dec...

Lava production from these "2,900-m vents" began to decrease in late March but declined most rapidly between April 7 and 9 from about 300,000 m3 per hour to less than 100,000 m3 per hour. Photo taken at 9:09 a.m.

Lava flows from the 1984 eruption of Mauna Loa loom above the town ...
April 4, 1984

Lava flows from the 1984 eruption of Mauna Loa loom above the town ...

Lava flows from the 1984 eruption of Mauna Loa loom above the town of Hilo. Photograph taken near the Hilo airport on April 4.

April 2, 1984

Mauna Loa Lava Flow, April 2, 1984

A USGS scientist walks along a lava flow from the April 2, 1984 Mauna Loa eruption. The scientist stops to observe a standing wave of lava at the end. The lava flow is moving at 64 km/hr (40 mph) towards Hilo, Hawai'i. 

Lava fountains erupting from fissure on upper northeast rift zone o...
March 25, 1984

Lava fountains erupting from fissure on upper northERZ of Mauna Loa...

Pohaku Hanalei cinder-spatter cone (upper left) is located about 3.2 km (2 mi) NE from the north edge of the caldera rim. Eruption rates were as high as 2.9 million m3 per hour during the first 6 hours of the eruption, then diminished to about 0.5 million m3 per hour for the next 12 days. Sizable pahoehoe flows formed only during the first day of the eruption and within a

Red hot lava erupts vertically in the air from a cone of black, hardened lava
September 6, 1983

Low fountain of lava from Pu'u 'O'o, Kilauea Volcano, 1983

Low fountain, approximately 50 meters high, from Pu'u 'O'o on Hawai'i Island's Kilauea Volcano (viewed from the north). Lava issuing from the breach in the northeast rim of the crater produced an 'a'a flow that extended more than 4 kilometers. Eruption episode 8.

Red hot lava fountaining 100 meters into the air from a cone of hardened, black lava
September 6, 1983

100-meter lava fountain, Kilauea Volcano, 1983

Pu'u 'O'o fountain approximately 100 meters high during eruption episode 8 on Hawai'i Island's Kilauea Volcano. Dark clots of spatter land near the base of the fountain, contributing to the growth of the cone. Less dense cinder, visible in the upper right, is carried downwind of the cone.

egg-shaped ball of red-hot lava with a blackened crust sitting on a bed of grass
July 23, 1983

Lava ball, Kilauea Volcano, 1983

Accretionary lava ball comes to rest on the grass after rolling off the top of an 'a'a flow in Royal Gardens subdivision on Hawai'i Island's Kilauea Volcano. Accretionary lava balls form as viscous lava is molded around a core of already-soldified lava.

Flat-topped cinder cone with red-hot lava splattering out of the top and cascading down the sides.
June 29, 1983

Pu'u 'O'o cinder-and-spatter cone, Kilauea Volcano, 1983

View at dusk of the young Pu'u 'O'o cinder-and-spatter cone, with fountain 40 meters high, on Hawai'i Island's Kilauea Volcano (episode 5).

A stream of red hot lava arcs into the air and splatters down on cooler, black lava flows
February 25, 1983

Arching fountain of lava, Kilauea Volcano, 1983

Arching fountain of lava approximately 10 meters high issuing from the western end of the 0740 vents, a series of spatter cones 170 meters long, south of Pu'u Kahaualea on Hawai'i Island's Kilauea Volcano (episode 2). Episodes 2 and 3 were characterized by spatter and cinder cones, such as Pu'u Halulu, which was 60 meters high by episode 3.

Photo showing a dozen narrow, blackened tree trunks with a crusted layer of black lava clinging to the bottom of each tree
January 7, 1983

Forest of lava trees, Kilauea Volcano, 1983

Forest of lava trees resulting from eruption of a 1-km-line of vents east of Pu'u Kahaulea on Hawai'i Island's Kilauea Volcano. The bulbous top of each lava tree marks the high stand of the lava flow as it spread through the trees. As the fissure eruption waned, the flow continued to spread laterally; its surface subsided, leaving pillars of lava that had chilled against

Lava fountains erupting from fissures, Kīlauea Volcano, Hawai‘i...
January 5, 1983

Lava fountains erupting from fissures, Kīlauea, Hawai‘i

Lava fountains erupt from fissures during the first week of the Pu‘u ‘Ō‘ō eruption south of Pu‘u Kahaualea, approximately 2.4 km (1.5 miles) northeast of where subsequent eruptions built the Pu‘u ‘Ō‘ō cone. The early fissures cut through old forested lava flows in a remote section of Kīlauea's east rift zone. Note single 'ohi'a tree burning in front of the fissures.

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March 18, 1994

Following the spectacular display of steam explosions and lava fountaining at the ocean entries last week, this week began with another pause in the eruption. By last Sunday morning, lava had stopped entering the ocean, and the lava tube upslope was drained and empty, although still brightly glowing.

Volcano erupts in big show
March 11, 1994

Lava activity at the coast where the flows enter the ocean has been spectacular this past week. The activity has included high lava spattering and formation of three new cones along the ocean entries. On Friday, March 4, explosions began at the coast and intensified during the day. 

March 4, 1994

The 11-year-long eruption on Kīlauea's East Rift Zone took a brief pause on Thursday, but activity resumed within a matter of hours. 

The hazards of post and pier foundations...
February 25, 1994

The column last week summarized the types of damage to structures resulting from shaking during large earthquakes beneath Hawai‘i.

February 18, 1994

Over the last several weeks, we have run suggestions of specific things that you can do to reduce your exposure to damage caused by earthquakes. 

Dangerous ledge collapses becoming more common...
February 11, 1994

Lava from the 11-year long eruption along Kīlauea's East Rift Zone continues to pour into the ocean near Kamoamoa inside Hawai‘i Volcanoes National Park. 

February 4, 1994

The magnitude-5.2 earthquake that occurred at 12:02 a.m. Tuesday morning served as a not-so-gentle reminder of the seismic hazard on the Island of Hawai‘i. The quake was felt throughout the State, with reports from as far away as Kapa'a, Kaua‘i. 

January 28, 1994

Large, damaging earthquakes have occurred frequently in Hawai`i in the past and will occur again in the future, as we discussed last week. However, there is a great deal you can do to reduce your personal risk.

January 21, 1994

A magnitude-6.6 earthquake devastated the Northridge area of Los Angeles on Monday, January 17, at 4:31 a.m. The extent and type of damage in the Los Angeles region caused by an earthquake of this magnitude has been shocking. 

Eleven years of activity at Kīlauea volcano - part II...
January 14, 1994

Editor's note: The following is part two of an 11-year retrospective look at Kīlauea Volcano - October 1992 through the end of 1993.

January 7, 1994

Editor's note: Today's "Volcano Watch" includes the first half of a 11-year retrospective of the Kīlauea eruption up to October 1992. Next week, the second half will cover the most recent volcanic action at Kīlauea.

December 24, 1993

The snow that fell this past week at the summits of Mauna Kea and Mauna Loa volcanoes reminds us that it can get cold enough to snow, even here in the tropics.