Unified Interior Regions


States L2 Landing Page Tabs

Filter Total Items: 364
Thumbnail of a poster which is laid out with photos, images, and text.
Date Published: January 1, 2004
Status: Completed

Oceanography Beyond the Golden Gate

Information about the USGS Pacific Coastal and Marine Science Center's oceanographic studies offshore of San Francisco Bay, from 1989-2003.

View of three USGS Visual Identity items
Date Published: October 1, 2001
Status: Completed

Water-Quality Sampling at Five Hydrologic Benchmark Stations in the Western United States

The Hydrologic Benchmark Network (HBN) was established in 1963 to provide  Swiftwater Creek, MT long-term measurements of streamflow and water quality in areas of the United States that are minimally affected by human activities. Historically, the HBN has used a fixed-interval sampling strategy, however other more robust sampling strategies are now available. Trend networks, for example, can...

Thumbnail of a poster which is laid out with photos, images, and text.
Date Published: January 1, 2001
Status: Completed

Mapping Shipping Hazards in San Francisco Bay

Information about the 1997-1998 study by USGS Pacific Coastal and Marine Science Center, to map the floor of San Francisco Bay in order to reveal the bay's shipping hazards.

Contacts: Peter Dartnell
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Two USGS Hydrologists taking water sample
November 28, 2016

Discover the great things going on in the Bay-Delta

Two USGS Hydrologists taking water sample

November 17, 2016

PubTalk 11/2016 — Ecological Stressors

Ecological Stressors: It's a Lot of 'WERC'
"There's is no place like California" by A. Keith Miles, Center Director, USGS Western Ecological Research Center

Highlights of the science of the USGS Western Ecological Research Center: 

  • Wildlife, drought, sea level rise
  • Endangered species, species of concern
  • Alternate energy,
October 27, 2016

PubTalk 10/2016 — Rockfalls in California's Sierra Nevada

Rock falls in California’s Sierra Nevada - Pursuing explanations for exfoliation and seemingly spontaneous fracture of rock

Two sea otters floating on their backs in water.
October 21, 2016

Sea Otters

Three of the nine wild sea otter populations in the U.S. are federally listed as threatened. In California, USGS biologists have lead an annual population census to assess the local populations' recovery, working closely with state agencies and the Monterey Bay Aquarium.

October 19, 2016

B-roll Sampling and Coring in San Pablo Bay

All clips show the deck of a barge in San Pablo Bay, California.

  • Clip 1 - USGS technicians lower and raise a grab sampler
  • Clips 2, 3, 4 - USGS technicians lower and raise a vibracore
  • Clip 5 - Tanker passes as USGS technicians work on anchor lines
  • Clip 6 - USGS technicians raise anchor, while another works on a vibracore tube
Men stand on a boat wearing safety gear and they are deploying instrumentation into the water using cables and ropes.
October 6, 2016

Deploying instrument package into Monterey Canyon

On October 6, 2016, scientists lower an instrument package on a taut-wire mooring into the canyon. The sediment trap (long funnel-shaped device) is designed to capture mud and sand carried in turbidity flows; the other sensors measure currents and suspended sediment.

People standing on a boat preparing an instrument for deployment, into the water.
October 6, 2016

Sediment trap deployment

Sediment trap is being prepared for deployment into Monterey Canyon offshore of Monterey, California.

September 30, 2016

Alluvial Thickness Model, Yucaipa area, California

To help visualize the Yucaipa groundwater basin geometry, this animation of the elevation of the top of the basement rocks was created. The animation allows the viewer to “fly” over the Yucaipa groundwater basin, viewing the land surface, geology (grouped by major geologic perioid and colored by deposit type), faults (color coded based on location), wells in different

Wind turbines at the Altamont Pass Wind Farm
September 8, 2016

Wind turbines at the Altamont Pass Wind Farm

The Altamont Pass Wind Far is located in northern California.

September 1, 2016

What is the Delta?

This short video is intended to serve as an introduction to the Sacramento and San Joaquin Delta, and is the first in a series of four short videos highlighting USGS science in the San Francisco Bay and Sacramento-San Joaquin Delta Estuary. This video serves to orient the viewer to physical characteristics of the Delta, the challenges facing it, and the work the USGS is

August 25, 2016

Tarantula Hawk

Tarantula hawk wasps sting and paralyze tarantulas to feed their young. USGS Ecologist Todd Esque captured this video of a tarantula hawk wasp dragging a tarantula through the desert in Mexico. 

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March 22, 2012

SAN DIEGO —Organic solvents were detected at high concentrations in 18 percent of the aquifer system used for public supply in the San Fernando and San Gabriel basins. However, groundwater is not directly used as drinking water; water purveyors may treat groundwater before delivering it to customers to ensure compliance with water quality standards.

March 20, 2012

MENLO PARK, Calif. Decisions made by the global community about emissions will directly impact the future of the western United States.  On March 22nd, Tom Suchanek, U.S. Geological Survey climate change coordinator, will discuss how increasing atmospheric carbon dioxide might affect human land-use and environmental systems in California and the Bay Area. 

March 8, 2012

MENLO PARK, Calif.— The El Mayor-Cucapah earthquake in northern Baja California, Mexico on April 4, 2010 triggered surface movement on several Southern California faults. Detailed mapping of these small movements by the U.S. Geological Survey, California Geological Survey, and other institutions, revealed previously unknown faults in the greater Salton Sea area...

February 29, 2012

SACRAMENTO, Calif.— Scientists at the U.S. Geological Survey have, for the first time, demonstrated how aquifer composition can affect how excessive levels of phosphorous (an essential nutrient contained in fertilizers) can be carried from fertilized agricultural fields via groundwater to streams and waterways. 

February 27, 2012

Waterfowl in California can spread low pathogenic avian influenza viruses during summertime when wetland temperatures are warm and waterfowl densities are low, according to a recent U.S. Geological Survey study.

February 21, 2012

MENLO PARK, Calif. — The U.S. Geological Survey and National Weather Service have developed the new FloodPath mapping system which allows scientists to produce maps of tomorrow's floods today – up to 3 days in advance of rising floodwaters.

February 9, 2012

The U.S. Geological Survey announces the establishment of the USGS California Volcano Observatory, or CalVO, headquartered within existing USGS facilities in Menlo Park, Calif. Establishing CalVO will increase awareness of and resiliency to the volcano threats in California, many of which pose significant threats to the economy and well being of the state and its inhabitants.

January 24, 2012

MENLO PARK, Calif. — Lassen Peak, the southernmost active volcano in the Cascade Range, erupted explosively in 1915 devastating nearby areas and sending volcanic ash as far away as 200 miles to the east.

Meeting between California Emergency Management Agency, CalVO, and ...
January 10, 2012

Welcome to the new USGS California Volcano Observatory website! The USGS Volcano Science Center recently restructured observatory operations to optimize volcano monitoring, eruption forecasting, and hazard mitigation efforts throughout California.

USGS science for a changing world logo
December 1, 2011

Differences in seismic activity along the San Andreas fault appear to be related to strength variations in the lower crust and upper mantle, as suggested by new findings in the Dec. 1 edition of Nature. 

CalVO staff assembled in the Rambo Auditorium, Menlo Park, CA...
November 30, 2011

During FY11, Long Valley Observatory's jurisdiction was expanded to encompass all California volcanoes and one volcanic center in Nevada. The Observatory's name will change to California Volcano Observatory (CalVO), which will correspond to a new website launch in early 2012.

USGS science for a changing world logo
November 15, 2011

New insights from recent Glen Canyon Dam high-water flow experiments on the Colorado River will be shared by USGS scientists on Wednesday night. They will discuss the results from these high-water flows in Grand Canyon National Park and describe the challenge of adaptively managing a highly regulated river.