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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February 19, 1993

In February 1877, an unusual eruption occurred on Mauna Loa Volcano. Part of the eruption was submarine, and the eruptive fissure was neither at the summit nor along one of Mauna Loa's well-defined rift zones. 

February 12, 1993

An intense earthquake swarm occurred beneath the upper to middle East Rift Zone of Kīlauea Volcano starting at 11:36 p.m. on Sunday, February 7. At the peak of activity, the seismic network operated by the Hawaiian Volcano Observatory was recording nearly 400 earthquakes per hour.

Recent earthquake activity recalls Kapoho eruption...
February 5, 1993

Earthquake activity this past week was considerably reduced from the high levels recorded the previous week. Three earthquakes occurred that had magnitudes greater than 3.0. The first, a magnitude 3.4, occurred on February 2 at 1:24 p.m. beneath the south flank of Kīlauea Volcano.

Most active seismic zone in the nation here...
January 29, 1993

Nearly everyone on the island of Hawai`i should have felt an earthquake this past week. As the accompanying map shows, Hawai`i was rattled by 11 earthqukes large enough to be felt in less than four days. 

Episode 51 continuing...
January 22, 1993

The eruption from the episode 51 vents, located on the west flank of the Pu`u `O`o cone on the East Rift Zone of Kīlauea Volcano, continues with little change. Lava is being fed to the coastline near Kamoamoa through a well-established underground tube system with only a few skylights, through which the flowing lavacan be seen from the air.

January 15, 1993

On Thursday an explosion in the crater of Galeras Volcano in Colombia killed six volcanologists attending an international workshop attended by more than 90 scientists, and killed an additional three people not attending the workshop.

Kīlauea: a youngster among world's active volcanoes...
January 8, 1993

One of the main impediments to predicting the future behavior of Kīlauea and especially Mauna Loa Volcanoes is the short historical record of each volcano. 

January 1, 1993

The Pu`u `O`o-Kupaianaha eruption now ranks as the longest-lived historic eruption on the East Rift Zone and the most destructive in Kīlauea's recent history. 

Underwater East Rift exploration reveals a few surprises...
December 11, 1992

The East Rift Zone of Kīlauea Volcano is 130 kilometers long, but only 55 kilometers of the rift is above sea level. The lower 75 kilometers of the rift is submarine and extends east-northeast from Cape Kumukahi to a depth of roughly 5,400 meters (17,700 feet). 

December 4, 1992

For the past 10 years, most of the evident changes on Kīlauea Volcano have occurred down the east rift zone near and downslope from the Pu`u `O`o and Kupaianaha vents. Last Sunday, a sequence of rockfalls occurred within the summit caldera that modestly changed the size and shape of Halema`uma`u Crater. 

Lava explodes into the sea at Kamoamoa...
November 27, 1992

Lava erupted from the episode 51 vents has been entering the sea at Kamoamoa since November 8. On Tuesday, a new phenomenon was observed. 

Lava continues to flow near Kamoamoa...
November 20, 1992

The eruption from the episode 51 vents has continued without interruption since October 2. The flows crossed the Chain of Craters Road near Kamoamoa in Hawai`i Volcanoes National Park on November 7. Since that time, flows have covered all of the Kamoamoa ruins, campground, parking lot, and picnic area, and have formed perhaps 30 acres of new land.