Unified Interior Regions

California

The Southwest Region includes California, Nevada, and Arizona. 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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Filter Total Items: 580
Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 wave-hazard projections: average conditions in Orange County

Model-derived significant wave height (in meters) for the given storm condition and sea-level rise (SLR) scenario.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenarios. CoSMoS v3.0 for So

Date published: January 1, 2017

Seafloor character--Offshore of Point Conception Map Area, California

This part of DS 781 presents data for the Seafloor character map of the Offshore of Point Conception Map Area, California. The vector data file is included in "SeafloorCharacter_OffshorePointConception.zip," which is accessible from https://doi.org/10.5066/F7QN64XQ. These data accompany the pamphlet and map sheets of Johnson, S.Y., Dartnell, P.,...

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 flood-hazard depth and duration projections: average conditions in Orange County

Maximum depth of flooding surface (in cm) in the region landward of the present day shoreline that is inundated for the storm condition and sea-level rise (SLR) scenario indicated. Note: Duration datasets may have occasional gaps in open-coast sections.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of k

Date published: January 1, 2017

Backscatter--Offshore of Point Conception Map Area, California

This part of DS 781 presents 2-m-resolution data for the acoustic-backscatter map of the Offshore of Point Conception Map Area, California. The GeoTiff is included in "Backscatter_OffshorePointConception.zip," which is accessible from https://doi.org/10.5066/F7QN64XQ. These data accompany the pamphlet and map sheets of Johnson, S.Y., Dartnell, P...

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 water-level projections: 20-year storm in Orange County

Model-derived total water levels (in meters) for the given storm condition and sea-level rise (SLR) scenario.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenarios. CoSMoS v3.0 for Souther

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 flood-hazard projections: average conditions in Orange County

Geographic extent of projected coastal flooding, low-lying vulnerable areas, and maxium/minimum flood potential (flood uncertainty) associated with the sea-level rise and storm condition indicated.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosi

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 wave-hazard projections: 20-year storm in Santa Barbara County

Model-derived significant wave height (in meters) for the given storm condition and sea-level rise (SLR) scenario.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenarios. CoSMoS v3.0 for So

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 wave-hazard projections: average conditions in Los Angeles County

Projected Hazard: Model-derived significant wave height (in meters) for the given storm condition and sea-level rise (SLR) scenario.
Model Summary: The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise %2

Date published: January 1, 2017

Habitat--Offshore of Point Conception Map Area, California

This part of DS 781 presents data for the habitat map of the Offshore of Point Conception Map Area, California. The vector data file is included in "Habitat_OffshorePointConception.zip," which is accessible from https://doi.org/10.5066/F7QN64XQ. These data accompany the pamphlet and map sheets of Johnson, S.Y., Dartnell, P., Cochrane, G.R.,...

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 flood-hazard depth and duration projections: 20-year storm in Orange County

Maximum depth of flooding surface (in cm) in the region landward of the present day shoreline that is inundated for the storm condition and sea-level rise (SLR) scenario indicated. Note: Duration datasets may have occasional gaps in open-coast sections.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of k

Date published: January 1, 2017

1992 orthophoto mosaic Malakoff Diggins State Historic Park, California

One of the largest hydraulic mines (1.6 km2) is located in California’s Sierra Nevada within the Humbug Creek watershed and Malakoff Diggins State Historic Park (MDSHP). MDSHP’s denuded and dissected landscape is composed of weathered Eocene auriferous sediments susceptible to chronic rill and gully erosion whereas block failures and debris flows occur in more cohesive ter

Date published: January 1, 2017

Acoustic Backscatter of the Sacramento River, from the Feather River to Knights Landing, California in February 2011

This part of the data release presents acoustic backscatter data collected on February 1, 2011, in the Sacramento River from the confluence of the Feather River to Knights Landing. The data were collected by the USGS Pacific Coastal and Marine Science Center (PCMSC) team with collaboration and funding from the U.S. Army Corp of Engineers. This project used interferometric sidescan sonar t

Filter Total Items: 1,109
A woman in a lab coat holds a small stack of metal sediment sieves, with an enlarged photo of the sieves to show detail.
March 16, 2017

Sediment sieves

We can use the tried-and-true method of washing samples through finer and finer sieves, then weighing the sediment trapped in each sieve, to determine sediment size fractions.

A woman wearing a lab coat lifts a long thin sediment core from a shelf.
March 16, 2017

Core racks for storage

In the cold storage room at the USGS Pacific Coastal and Marine Science Center, we store cores on large racks that can hold about 4,500 full sized cores or D-tubes with split cores, up to 1.5 meters long.

A stack of metal pans sit in a metal frame with a ventilation unit behind it, and a hand flips a switch on the machine.
March 16, 2017

Ro-Tap for dry-sieving coarse sediment

At the USGS Pacific Coastal and Marine Science Center, we have 3 WS Tyler RX-29 Ro-Taps that can dry-sieve coarser samples. This machine automatically rotates and taps the stack of sieves, so that smaller sediment falls through to the next sieve. Weighing the sediment trapped in each sieve gives us sediment size fractions.

A woman wearing a lab coat and rubber gloves holds a rotating handle on the wall of a rack that runs on a track.
March 16, 2017

Rolling core storage racks

These track-mounted racks pack together to save space. Cranking a handle moves the aisle between racks for core access.

A woman wearing a lab coat and rubber gloves holds a plastic dropper over a hole in a machine in a laboratory.
March 16, 2017

Laser diffraction for measuring sediment size fractions

The Beckman Coulter LS 13 320 uses laser diffraction to automatically analyze sediment size fractions between 2 millimeters and 0.35 micron (-1 phi to 11.5 phi).

A woman wearing a lab coat wheels a tray, with a sediment core resting on top, out through a big metal door.
March 16, 2017

Exiting the cold sample storage room

The back door of the refrigerator connects to our core and sample processing labs.

A woman in a lab coat stands in front of a machine operating a turnstile with a beaker in it.
March 16, 2017

X-ray particle-size analysis of sediment settling rates

The Micromeritics Sedigraph III uses X-rays to automatically analyze settling times for sediment sizes between 300 microns and 0.1 microns (2 phi to 13 phi).

A woman wearing a lab coast and rubber gloves stretches a piece of plastic wrap over an exposed sediment core on a lab table.
March 16, 2017

Wrapping a sediment core half

Each half of a split sediment core is wrapped in plastic to prevent drying and contamination. For long-term storage, we can shrink-wrap one half with a thick film that prevents moisture loss.

A woman in a lab coat climbs steps next to a large clear tube suspended upright in a metal frame
March 16, 2017

Settling tube lab

For some projects, scientists want to calculate sediment settling velocity and need to measure particle size using gravity. We use custom-built settling tubes filled with water – three at 2 meters tall (like the one shown here) and one 3 meters tall.

A woman wearing a lab coat and rubber gloves places a long plastic tube on a narrow storage shelving unit.
March 16, 2017

Storing sediment core D-tubes

We slip split cores into a labeled D-tube, and both are stored on specialized core racks in a walk-in sample refrigerator. USGS and non-USGS scientists often use our core and sample archives for new research. Contact the lab manager for access policies and other details.

A woman in a lab coat prepares to pour a small amount of sediment onto louvered opening above a tube filled with water.
March 16, 2017

Settling tube sediment delivery mechanism

The settling tube is filled with water and a pre-weighed sediment sample of mixed particle sizes is poured onto this brass "gate" at the top of the tube. When the operator flips the switch, the gate opens quickly like a venetian blind, releasing the whole sediment sample into the water column at the same time.

A person's hand holds a book containing a color coded system for identifying sediment near a sediment core lying on a tabletop.
March 16, 2017

Munsell chart colors for describing sediment in a core

Lab technicians create written descriptions of sediment cores, referencing Munsell chart colors and standard phrases.

Filter Total Items: 985
USGS science for a changing world logo
April 25, 2011

Beginning on or about June 8th and lasting approximately one month, an airplane under contract to the U.S. Geological Survey, and in partnership with the Utah Geological Survey, will begin collecting and recording geophysical measurements over parts of northern Utah from Snowville, east to Brigham City, and south to Farmington Bay.  The flights will cover the eastern and southern parts of Box

USGS science for a changing world logo
April 8, 2011

A new report issued by the American Red Cross and the U.S. Geological Survey documents the Chilean response and recovery efforts following the Feb. 2010 magnitude 8.8 earthquake and the lessons that California should learn from this disaster.   

USGS science for a changing world logo
April 6, 2011

On April 8, 2011 officials from the Red Cross, the U.S. Geological Survey, and the City of Los Angeles will hold a press conference at Los Angeles City Hall to announce the findings of a just-released report on the magnitude 8.8 earthquake in Chile in 2010 and the implications for Los Angeles.

USGS science for a changing world logo
March 29, 2011

How birds find their way over great distances during homing and migrational flights is the subject of the U.S. Geological Survey public lecture on Thursday, March 31st. After nearly half a century of intensive research, biologists are still unable to agree on how birds manage to navigate with such uncanny accuracy. 

USGS science for a changing world logo
March 29, 2011

How birds find their way over great distances during homing and migrational flights is the subject of the U.S. Geological Survey public lecture on Thursday, March 31st. After nearly half a century of intensive research, biologists are still unable to agree on how birds manage to navigate with such uncanny accuracy. 

USGS science for a changing world logo
March 29, 2011

Nitrogen and phosphorus concentrations decreased in streams of the Santa Ana Basin during 1975–2004, as improved wastewater treatment was implemented basinwide. Nutrient concentrations in the San Joaquin Basin during the same period increased in association with increased land application of nutrients. In the Sacramento Basin nutrient trends were mostly downward. 

USGS science for a changing world logo
March 25, 2011

U.S. Geological Survey field crews recorded the two highest direct measurements made in the last 70 years at two streamgages on the San Lorenzo River yesterday. Woody debris, including large trees, carried by the turbulent river destroyed two flow meters, but new equipment was shuttled in and the record measurements completed.

USGS
March 17, 2011

The images of destruction coming from Japan have caused those who dwell on America's West Coast to wonder: Could a devastating tsunami hit here? The answer is a resounding yes. Our coast is under threat from two types of tsunamis.

USGS science for a changing world logo
March 7, 2011

Government and university scientists are collecting seismic images, or pictures, of the Earth's crust beneath the Imperial and Coachella Valleys in southern California this week. 

USGS science for a changing world logo
March 3, 2011

U.S. Geological Survey scientists who study trends in climate change will be presenting the results from new studies at the Pacific Climate Workshop held in Pacific Grove, California, at the Asilomar Conference Grounds, March 6-9.

USGS science for a changing world logo
February 15, 2011

Forests should be managed according to their respective, specific fire ecology — not whole-scale fire suppression or one-size-fits-all plans — to optimize forest growth and stabilize carbon storage.

USGS science for a changing world logo
February 15, 2011

Forests should be managed according to their respective, specific fire ecology — not whole-scale fire suppression or one-size-fits-all plans — to optimize forest growth and stabilize carbon storage.