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.

States L2 Landing Page Tabs

Filter Total Items: 2,069
Image: An Endangered Puaiohi (Small Mountain Thrush) in Hawaii
May 19, 2011

An Endangered Puaiohi (Small Mountain Thrush) in Hawaii

Many species of Hawaiian honeycreepers have persisted into the 20th century because high elevation rain forests on the islands of Kaua’i, Maui, and Hawai'i are cool enough to limit transmission of introduced avian malaria (Plasmodium relictum). Malaria transmission is tied closely to the effects of temperature on development of malarial parasites within their

A petrologist explains Kīlauea's eruptive condition...
May 13, 2011

A petrologist explains Kīlauea's eruptive condition

The western Kamoamoa fountain-fed lava flows advanced over 1997 lavas (dark flow in foreground) with 1965 and 1968 lavas buried by Pu‘u ‘Ō‘ō cinder to the far left. Pu‘u ‘Ō‘ō is in the distant background.

March 14, 2011

Lava Spatter

Video of spattering near the front of the propagating 

March 14, 2011

Vent Collapse at Rim of Halema`uma`u

This video, also compiled from the Webcam on the rim of Halema‘uma‘u, shows the north rim of the vent collapsing.

March 14, 2011

Rim Collapsing into Lava Lake

This clip, captured by a video camera on the rim of Halema‘uma‘u to the southwest of the vent, shows a small slice of the western rim of the vent collapsing into the 

March 14, 2011

Lava Pouring From Fissure

Video showing lava pouring from the 

March 14, 2011

Lava Spattering Near Pu`u `Ō`ō

Video showing spattering from the most persistent vent of the day just west of the base of Pu‘u ‘Ō‘ō near the northeastern end of the 

March 14, 2011

Fissure Propagating

Video clip shot in front of the propagating fissure

Geologist samples layers formed by explosive eruptions at Kīlauea V...
March 11, 2011

Geologist samples layers formed by explosive eruptions at Kīlauea, ...

These tephra deposits are from the Kulanaokuaiki Tephra erupted from Kīlauea Volcano about 200 to 1000 C.E. The base of a lava flow overlying the tephra is just above the person's hand. This site is located near the base of Kīlauea's summit crater wall, directly below the USGS Hawaiian Volcano Observatory and NPS Jaggar Museum.

Eruption of low lava fountains from a fissure at Kilauea Volcano, Hawaii.
March 11, 2011

Fissure eruption of lava fountains, Kīlauea Volcano’s East Rift Zone

Fissure eruption of low lava fountains from Kīlauea Volcano’s East Rift Zone in 2007, Island of Hawaiʻi.

March 7, 2011

Lava Fountaining Adjacent to Nāpau Crater

Video showing low fountaining from the dominant vent, near the southwest end of the fissure system adjacent to Nāpau Crater, active during the day on March 7.

Filter Total Items: 2,249
View of Pu`ukapukapu looking eastward along the coast.
May 2, 2002

Pu`ukapukapu sits atop the most imposing cliff along the south coast of Kilauea, towering over the back-country camp site of Halape and dropping 320 m (1,050 feet) precipitously into the sea. Pu`ukapukapu is an impediment to coastal foot travel, an imposing view point, and a mystery.

View across the crater of Pu`u `O`o showing the lava pond
April 25, 2002

Lava has been a frequent visitor at Pu`u `O`o cone these past few weeks. It has flooded the crater floor and erupted from vents around the cone. Previous pond activity was in the autumn of 1999 and, before that, in 1997. What's changed?

April 18, 2002

One evening a couple of weeks ago, the summit of Kilauea began to deform at an impressive rate. Although the ground tilt and associated tremor caused by magma moving beneath the caldera was not humanly perceptible, sensitive instruments let us know that something unusual was up.

April 11, 2002

April is "Tsunami Awareness Month" in Hawai`i. Tsunami is the deadliest natural hazard in Hawai`i. The month of April is chosen to remind people of this hazard because on April 1, 1946, a tsunami, generated in the Aleutians by a magnitude-7.8 earthquake, swept through the islands and killed 159 residents.

volcanic explosion, Kilauea
April 4, 2002

Kīlauea has had many explosive eruptions in the past. Fortunately, we have no evidence that the volcano is building to another one. But it is prudent to examine the past to know what to expect in the future.

photo of lava
March 29, 2002

Spatter structures, and crustal overturning in Episode 55 crater

photo of lava
March 28, 2002

Pu`u `O`o spatter cones, spitting hornito, and rootless shield

March 28, 2002

How big is an eruption? This is a short question with a long answer. Volcanologists, like other people, judge the size of something by comparing it to something else. Volcanic eruptions span such a large range in size, style, and duration that comparisons can be hard, especially between volcanoes with different eruptive styles.

March 21, 2002

From time to time, we get calls from people who are writing about Kilauea, hoping to confirm the idea that Kilauea is the most active volcano on Earth. We have to tell them that, no, it's only one of the most active volcanoes.

March 14, 2002

A heightened awareness of earthquakes usually follows large and destructive ones, like those occurring in Turkey and El Salvador in 1999 and 2001, respectively. Combined, these earthquakes killed more than 37,000 people.