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: 1,576
May 2, 2005

Spatter Cone Collapse at MLK Vent

(May 2, 2005, 02:30:28 to 07:30:37) The spatter cone collapse described in the movie below was also recorded by a time-lapse camera on the west flank of the Pu‘u ‘Ō‘ō cone. This camera was located about 70 meters from the MLK vent and recorded two pulses of lava effusion from the vent before collapse. The first, and larger, pulse of effusion was abruptly terminated by a

February 10, 2005

Lava Fountaining from the MLK Vent

(February 9, 2005, 18:00:30 to February 10, 2005, 08:00:31) On February 9, 2005, an increase in lava discharge from Pu‘u ‘Ō‘ō, part of a longer term increase in effusion rate (Miklius and others, 2006), resulted in vigorous spattering and low fountaining from the MLK vent. Before the event, the tallest of the small complex of spatter cones over the MLK vent was about 6–7

Poster laid out with photos, images, and text.
December 31, 2004

Island-hopping Coral Larvae in Hawaii

Large-scale poster describing USGS work.

Scientists from the USGS, the University of Hawaii (UH), and Maui tracked the movements of reef-building coral larvae near Maui, Hawaii. We built and used “drifters”—floating instruments with radios and GPS receivers that drift in the currents with the coral larvae. We released the drifters when the corals released their

March 2, 2004

Pu`u 'Ō`ō Crater Lava Flow

(March 2, 2004, 11:48:17 to 23:08:42) Late 2003 through early 2004 marked a period of heightened eruptive activity at Pu‘u ‘Ō‘ō (Miklius and others, 2006) on Kīlauea Volcano's east rift zone, with lava frequently spilling from vents within the Pu‘u ‘Ō‘ō crater. This time-lapse movie, captured by a Webcam located on the northern rim of Pu‘u ‘Ō‘ō, shows lava erupting from a 

February 26, 2004

PubTalk 2/2004 — Life and Death of Hawaiian Coral Reefs

New Studies Track the Life Cycle of Maui's Changing Reefs

By Michael E. Field, Marine Geologist & Curt D. Storlazzi, Coastal Oceanographer

  • How are coral reefs changing, and why is it a concern?
  • Agents of change on Maui's reefs have both natural and human causes
  • Coral eggs and sperm released during
Nene goose stands among coastal vegetation
February 18, 2004

Nene goose stands among coastal vegetation

A nene goose, Hawai‘i's state bird and an endangered species, stands among coastal vegetation on O‘ahu island. USGS researchers have tracked nene movements using GPS transmitters to determine where they spend their time and to inform policy and decision making regarding their continued protection under the Endangered Species Act. 

October 3, 2003

Nearly continuous spattering from west vent of West Gap Pit

Nearly continuous spattering from west vent of West Gap Pit, and sporadic spatter bursting from tall hornito to left. Heaving pond of lava between camera and vent. Hand-held camera, so a bit shaky. Note especially the symmetrical burst from hornito at about 15 seconds. Noise is reasonable facsimile of the real thing, emphasizing the treble.

October 3, 2003

Spattering from east vent in West Gap Pit

Spattering from east vent in West Gap Pit, taken from same place as other video and also hand-held. Note the spatter rampart under construction by the falling spatter. Helicopter noise for first several seconds.

July 5, 2003

Lava pours out from under crust

Lava pours out from under crust at front of advancing breakout. See still taken at 0607:33 today.

July 5, 2003

Lava emerges from under crust

Lava emerges from under crust along side of breakout on steep slope. Listen to creaking sounds, about halfway through video, as crust flexes and breaks. See still taken at 0610:15 today.

July 5, 2003

Lava appears from under crust and drops into depression

Lava appears from under crust and drops into depression at front of advancing breakout. Width of blob of lava that appears is about 30 cm.

July 5, 2003

Lava flow

This clip lasts 30 seconds and so is a large file, but it shows such notable dynamics at flow front that it might be worth it to some of you patient ones. The active stream is 50-75 cm wide. Note, early on, how sliding crust plows into lava.

Filter Total Items: 1,987
November 14, 2002

On November 3, one of the largest recorded earthquakes to strike the U.S. mainland rocked the interior of Alaska. The quake caused countless landslides, opened 1.8 meter (6-foot) cracks in highways, shook homes and damaged supports to the Trans-Alaska pipeline.

November 7, 2002

Air travelers to Hawai`i are familiar with the jet stream. The strong, high-level winds typically come from the northwest and slow west-bound flights by 30 minutes or more. Residents of Hawai`i returning from the mainland are frustrated by the jet stream; it takes longer to get home than to leave!

October 31, 2002

Several recent "Volcano Watch" columns have dealt with Mauna Loa and the implications of renewed inflation of its summit. For better or worse, this one will be no different except that it will be a "What if," rather than a "What is," topic. What if the lava flow produced in the most recent eruption of Mauna Loa had continued to Hilo? Where would the flow have gone?

October 29, 2002

When most people think of Hawaii, they think of a tranquil tropical paradise. But savvy Hawaiians know better: an old proverb says that "when the gales blow, the sea is white-backed; when the sea rises, corals are washed ashore."

October 24, 2002

A "Volcano Watch" article several weeks ago indicated changes occurring atop Mauna Loa. Specifically, global positioning system (GPS) receivers on Mauna Loa are showing that after eight years of steady contraction, extension is again occurring across the summit. Over 2 cm of the 7 cm lost to contraction since 1993 has been regained in the last five months.

October 17, 2002

Recent visitors to the coastal eruption site, especially those unwise enough to approach the flow margins where lava is encroaching on vegetation, are being greeted by a sometimes underrated volcanic hazard-the "methane" explosion.

October 10, 2002

In the Volcano Watch article two weeks ago, we broke the news that the summit area of Mauna Loa is swelling for the first time since 1993. If this trend continues, we're on track for the next eruption.

October 3, 2002

Many streams of lava entering the ocean are shattered to bits in the surf zone. These loose fragments gradually build layers of rubble on the steep submarine slope. The resulting nearshore submarine deposits are complexly interbedded lava flows and fragments ranging in size from boulders to tiny shards of glass and minerals.

Skylight, Kīlauea Volcano, Hawai‘i...
September 27, 2002

Skylight, Kīlauea Volcano, Hawai‘i.

September 26, 2002

Mauna Loa has gone 18.5 years without eruption--the second longest dry spell since detailed records begin in 1843. The longest period without eruption lasted 25 years, between 1950 and 1975. Clearly the past 52 years have been much less active than the previous 107.

September 19, 2002

In early August, Pago volcano, on the central coast of New Britain Island, suddenly began exploding rocks and volcanic ash into the air. Thousands of nearby residents quickly left their homes and work to escape possible injury or death.

September 12, 2002

Recent work sheds light on Mauna Loa's magmatic plumbing. The U.S. Geological Survey has embarked on scientific investigations of the plumbing system of Mauna Loa in cooperation with researchers from University of Washington and University of North Carolina.