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: 583
Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 wave-hazard projections: 1-year storm in Ventura 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 flood-hazard projections: 20-year storm 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 water-level projections: average conditions 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 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

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

Filter Total Items: 481
Publication Thumbnail
Year Published: 1970

Physiographic diagrams of parts of the continental borderlands of California and Alaska: 12 physiographic diagrams: Southern California Borderland; Eastern Murray Fracture Zone and Transverse Ranges; Southern Monterey Bay; Monterey Canyon; Central San

Alpha, Tau Rho
Physiographic diagrams of parts of the continental borderlands of California and Alaska: 12 physiographic diagrams: Southern California Borderland; Eastern Murray Fracture Zone and Transverse Ranges; Southern Monterey Bay; Monterey Canyon; Central San; 1970; OFR; 70-5; Alpha, Tau Rho

Filter Total Items: 1,116
A person wearing a lab coat and rubber gloves holds clear plastic tube with water running into a cylindrical metal pan.
March 16, 2017

Sieving sediment

Washing a sediment sample through two sieves with distilled water lets us measure the fractions of gravel (bigger than 2 millimeters or -1 phi) and sand (2 millimeters to 63 microns, -1 phi to 4 phi). Smaller sediment passes through the sieves into a standard 1-liter graduated cylinder.

A woman in a lab coat holds a tall plastic cylinder with murky water in it, and a plunger to carefully stir the water.
March 16, 2017

Sediment suspension preparation

After adding a little sodium hexametaphosphate dispersant, we use a plunger to carefully stir the cylinder then let it settle, to ensure good mixing and standardized suspension of the sediment.

A woman wearing a lab coat pushes a cart with a tube of sediment through a large metal door.
March 16, 2017

Refrigerated sample storage

We take most cores and samples straight from the loading dock into a large walk-in refrigerator (about 780 square feet), kept at the international core curation standard of 4° C plus or minus 2° C. Each core and sample must be labeled with an identifier and metadata, which follows the material through processing and analysis.

A woman in a lab coat holds a tall plastic cylinder with murky water in it, and a sampling device to take a small amount out.
March 16, 2017

Subsampling the suspended sediment sample

Lab technician Angela Tan takes a sample of the sediment suspended in liquid, for analysis in one of several ways.

A woman, wearing a lab coat and protective equipment in a laboratory, holds a core in a device that will split the core in half.
March 16, 2017

Geotek core splitter

In the core lab, the Geotek core splitter cuts sediment cores in half lengthwise using oscillating saws and a wire cutter.

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 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 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 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 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.

Filter Total Items: 986
USGS science for a changing world logo
April 27, 2011

High concentrations of naturally occurring elements, including arsenic and boron as well as human-introduced compounds such as nitrate, were found in three aquifers studied in the Sacramento Valley. Scientists determined that concentrations of these substances in untreated water exceed state and federal health standards for drinking water. 

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.