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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September 11, 1992

"With all the lava being erupted, is there a large, empty space within the Earth where the lava came from?" This is a frequent question answered by the staff of the U.S. Geological Survey's Hawaiian Volcano Observatory, and the answer is "no."

Kīlauea vents active but lava has slowed...
September 7, 1992

The episode 51 vents have been continuously active since early in the morning on July 27. The active vents are located just west of the Pu`u `O`o cinder and spatter cone on the East Rift Zone of Kīlauea Volcano. Episode 51 has been characterized by intermittent activity since it began on March 7.

September 4, 1992

To the non-geologist, lava is hot, orange molten rock, or when cooled, smooth and gray, or black and jagged rock. However, to the geologist or volcanologist, lava contains a set of clues to decipher processes occurring in the interior of the Earth and the volcano.

August 14, 1992

The Hawaiian Volcano Observatory's primary purpose is to understand how volcanic systems operate. All of the work we do in defining geological hazards posed by the volcanoes, and short-term monitoring of eruptions and lava flows, is made possible by developing this fundamental understanding of volcanic systems.

Episode 51 vents become active again...
July 31, 1992

The episode 51 vents once again became active early Monday morning after a brief pause since the previous Thursday morning. Prior to this last pause, eruptive activity had been continuous since June 21.

Kīlauea's episode 51 finally calls it quits...
July 24, 1992

After being in continuous eruption since Sunday, June 21, the episode 51 vents adjacent to Pu`u `O`o on the East Rift Zone of Kīlauea Volcano finally shut off in the morning on Thursday. Until this extended eruptive period, episode 51 has been characterized by intermittent activity since it began on March 7.

Lava expected to flow over pali toward Kamoamoa soon...
July 17, 1992

The episode 51 vents adjacent to Pu`u `O`o on the East Rift Zone of Kīlauea Volcano have been in continuous eruption since before dawn on June 21. Until this period, episode 51 has been characterized by off-and-on activity since it began on March 7. The current eruptive interval is by far the longest and most stable since that time.

July 10, 1992

The Hawaiian Volcano Observatory has joined forces with the University of Hawai`i to promote the collaborative study of volcanoes with the initiation of a new Hawai`i Center for Volcanology. On Tuesday this new center was officially announced during a press conference held in Honolulu on the university campus.

HVO maintains wide seismic network on the Big Island...
July 3, 1992

The Hawaiian Volcano Observatory maintains a network of about 50 seismic stations on the Island of Hawai`i. The purpose of the network is twofold: to define the regional seismicity of the Island of Hawai`i, and to distinguish and study earthquakes as they relate to major fault zones and to the eruption and intrusion of magma. 

Current eruption continuing at low levels...
June 26, 1992

We will cover activity during the last two weeks, since we missed our deadline last week. The episode 51 vents on the west flank of Pu`u `O`o, which began erupting on Wednesday, June 10, shut down on June 16. The vents were then inactive until Sunday, June 21, and have continued to be active through June 26.

Kīlauea's not Hawaii's only active volcano...
June 12, 1992

The volcanic hazards posed by Kīlauea Volcano are obvious to everyone who sees the active eruptions and visits Hawai`i Volcanoes National Park, where the starkness of much of the volcanic landscape is a testament to the recency of activity. 

Volcano slides are often the cause of strong earthquakes...
June 5, 1992

Moderate to large earthquakes located beneath the south flank of Kīlauea Volcano are commonly caused by seaward sliding of that part of the volcano. On Friday, May 29, at 2:03 p.m., a 3.3-magnitude earthquakeoccurred about five miles deep and 15 miles offshore from Kīlauea's shoreline.