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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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. 

Eruption episode remains unpredictable...
May 29, 1992

The episode 51 vents on the west flank of Pu`u `O`o, which stopped erupting on May 22, began erupting again on Wednesday morning sometime shortly before dawn. This eruptive interval was extremely vigorous on Wednesday and Thursday, but stopped Thursday during the night. 

Sputtering lava flows build behind shield...
May 22, 1992

The episode 51 vents on the west flank of Pu`u `O`o which were inactive for six days starting Tuesday, April 28, were in continuous eruption since Monday, May 4, starting at about noon, until Friday afternoon. During this 18-day interval, the eruption was nearly constant in level of activity, as seen in tremor of nearly constant amplitude.

Episode 51 vents now mostly inactive...
April 24, 1992

The episode 51 vents on the west flank of Pu`u `O`o were inactive most of this past week. Last Sunday afternoon, the flows had advanced about one mile south of the vents and burned about 150 acres of forest. 

Eruption continues without interruption...
April 17, 1992

The eruption at the episode 51 vents on the west flank of Pu`u `O`o continued without interruption again this week. The eruption is little changed from a week ago, when we reported that a lava pond had formed just west of the vent. The pond is overflowing and sending a surface-fed pahoehoe flow to the south. 

Lava flow continues; quake tremors light...
April 10, 1992

The eruption at the episode 51 vents on the west flank of Pu`u `O`o continued without interruption this week. A lava pond has formed just west of the lower vent. This pond fills and overflows during periods of high-volume eruption, but most of the time flows are fed through tubes in the sides of the pond. The main flow from the pond has been toward the west.

Lava flow continues in starts and stops...
April 3, 1992

Last week we noted that, based on the activity in the pond inside Pu`u `O`o cone, the lull in activity at the episode 51 vent was probably just another pause in episode 51. Sure enough, the vent again began erupting Sunday morning about 9:30 a.m., or about the time you were reading about the eruption in last Sunday's paper.

Eruption pauses; earthquake shakes isle...
March 27, 1992

The eruption at the episode 51 vent slowed dramatically on Thursday at about 2:00 p.m. and by Friday morning there was no eruptive activity at the vent on the west flank of the Pu`u `O`o cone. The activity in the pond inside the Pu`u `O`o cone suggests that the current lull in activity is just another pause in episode 51.

No episode 52 after all, just repeats of 51...
March 20, 1992

With the wisdom of hindsight, we have concluded that the continuing episodic eruptive activity from the vent on the west flank of the Pu`u `O`o cone is a single episode with pauses, rather than a new episode with each eruption at the vent. We are therefore continuing to call the activity that began on March 7 "episode 51."

Episode 51 stops, 52 begins at Kīlauea Volcano...
March 15, 1992

Episode 51 of the nine-year long eruption along Kīlauea Volcano's East Rift Zone stopped by 4:00 p.m. Thursday afternoon. As we forecast last Sunday, this episode was brief, lasting only from March 7-12.

Kīlauea has busy week; new episode begins...
March 6, 1992

The nine-year long eruption along the East Rift Zone of Kīlauea Volcano took two dramatic turns this past week, but ended up nearly where it started.