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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Five earthquakes shook Big Island in two weeks...
August 20, 1993

Hawai`i had five felt earthquakes in the last two weeks. The activity included a magnitude 3.7 shock at 12:29 a.m. on August 12. This earthquake was located offshore from Kawaihae at a depth of nearly 34 miles.

August 13, 1993

One of the tools we use to determine the likelihood of future eruptions and earthquakes is to measure changes in the shape of the ground surface.

August 6, 1993

A symposium will be held this week on Thursday from 8:30 a.m. to 4:30 p.m., at the University of Hawai`i at Hilo, Campus Center Rooms 306 and 307, with scientists, government officials, and the public participating in broad-ranging discussions about volcanic eruptions and earthquakes in Hawai`i.

Kīlauea lava resumes ocean flow...
July 30, 1993

The eruption along Kīlauea's East Rift Zone paused briefly a week ago, beginning Friday morning but activity had resumed again by last Sunday afternoon.

Flow stops, but eruption goes on...
July 23, 1993

Regular readers of this column may have noticed that the last week's column ended in mid-sentence. This unfortunate situation was caused by an inadvertent mistake in layout. 

Tsunami, landslide cause most quake damage...
July 16, 1993

A great earthquake, with a magnitude of 7.8, struck northern Japan during the night on Monday, July 12. Most of the deaths were attributed to a tsunami that was generated by the earthquake, but other people were killed in a landslide and by falling buildings.

July 9, 1993

The 10-year-long eruption on Kīlauea's East Rift Zone continues with lava flowing from the vents on the south and west sides of Pu`u `O`o to the sea in underground tubes.

Lava from Kīlauea's East Rift Zone lessens...
June 18, 1993

The 10-year-long eruption on Kīlauea's East Rift Zone continues, with the only change being a decrease in eruption rate over the last few weeks. This decrease in rate correlates with the slowly deepening surface of the lava pond inside the Pu`u `O`o cone, as reported last week.

June 11, 1993

The largest earthquake in Hawai`i since January 26 occurred at 2:58 a.m. Tuesday. Many residents were awakened by the shaking from this magnitude-4.9 earthquake. The Jan. 26 earthquake, which occurred beneath Pahala, had a comparable magnitude. 

June 4, 1993

This week marks the anniversary of one of the largest of Mauna Loa's historic eruptions. On June 1, 1950, the last great eruption of Mauna Loa began just after 9:00 p.m. 

Eruption's flows continue, danger remains...
May 28, 1993

The eruption on Kīlauea's East Rift Zone continues with little change. The episode 51 and 53 vents on the southwest flank of the Pu`u `O`o cone continue to feed lava directly into a tube system that transports the lava to Palama Pali and beyond, to the ocean entries at Kamoamoa. 

May 21, 1993

A magnitude 3.0 earthquake was widely felt in the Hilo area on Thursday afternoon at 1:45 p.m. The earthquake was about 25 miles deep and was located offshore about 10 miles east of Hilo.