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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April 9, 1993

The eruption near Pu`u `O`o on Kīlauea's East Rift Zone continues, with lava entering the ocean both east and west of Kamoamoa and at Lae`apuki.

April 2, 1993

In historical times, two tsunamis occurred during the first week of April. The first of these occurred on April 2, 1868; it resulted from the great earthquake that took place that day near Pahala.

March 26, 1993

Lava continues to flow from two active vents on the south and southwest flanks of the Pu`u `O`o cinder cone on Kīlauea's East Rift Zone. These vents have been simultaneously active since the eruption restarted on February 20, following a 10-day period of repose and a four-day-long period, when only the episode 51 ventwas active. 

25 years since last Mauna Loa eruption...
March 19, 1993

This Thursday marks the ninth anniversary of the beginning of the last eruption of Mauna Loa Volcano, following a nine-year period of quiescence.

March 12, 1993

The eruption on Kīlauea's East Rift Zone continues, with little change from last week. Lava from the episode 51 and 53 vents, both located on the southwest flank of the Pu`u `O`o cone, flowed through lava tubes to the coast.

Lava flows from two Pu'u 'O'o vents...
March 5, 1993

The eruption on Kīlauea's East Rift Zone continued through the week. Two vents were active, both located on the flanks of the 770-foot-high Pu`u `O`o cone.

February 26, 1993

The 10-year-long eruption at Kīlauea Volcano started up again during the morning of February 16, after a period of inactivity lasting about 10 days. The eruption began at the episode 51 vents on the west flank of Pu`u `O`o, with only small volumes of pasty lava flowing through the pre-existing tubes. 

Pu`u `O`o eruption is volcano's 50th episode...
February 21, 1993

On Monday, Feb. 17, at about 7:30 p.m., lava began erupting from a fissure on the southwest flank of Pu`u `O`o.

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.