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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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. 

May 15, 1993

Volcanoes around the world emit a variety of gases in different proportions, with the main components invariably being carbon dioxide, water, and sulfur dioxide. Minor components include, but are not limited to, hydrogen gas, carbon monoxide, hydrochloric acid, hydrofluoric acid, methane, and hydrogen sulfide.

May 14, 1993

May 18 marks the anniversary of the 1980 eruption of Mount St. Helens that laid waste to over 200 square miles of forest and killed 57 people, as well as thousands of wild animals and birds.

May 10, 1993

Kīlauea is famous for eruptions of the type we are now experiencing - quiet effusion of lava that makes the eruption approachable. However, not all of Kīlauea's eruptions have been so passive and approachable.

May 7, 1993

The 10-year-long eruption along Kīlauea's East Rift Zone continues with little change. Active flows travel underground to the ocean in lava tubes from the eruptive vents on the south and west sides of the Pu`u `O`o cone.

As lava slows, diversion of Etna discussed...
May 1, 1993

The episode 51 vents on the west flank of Pu`u `O`o were active from April 23 at about 11:00 a.m. until April 28 at 11:30 a.m., when the eruption stopped once again. Since then, the lava lake inside Pu`u `O`o vent has risen from about 140 to between 120 and 130 feet below the rim of the crater.

April 30, 1993

The 10-year-long eruption on Kīlauea's East Rift Zone continues with little change. During the week, the lavaentries into the ocean consolidated to three main entries on the east and west edges of the Kamoamoa flow and near the west edge of the Lae`apuki flow. 

April 23, 1993

The missing visitor to Hawai`i Volcanoes National Park serves as a tragic reminder that active volcanoes can be unpredictable and dangerous, however passive and approachable their eruptions. Kīlauea is no exception. 

April 16, 1993

The 10-year-long eruption on Kīlauea's East Rift Zone continued this past week. Lava is erupting from the episode 51 and 53 vents on the southwest side of the Pu`u `O`o cone, but is being carried towards the coast entirely within underground lava tubes as far as the top of the pali.