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Animation shows map of land and sea, land doesn't change and the ocean and bay change colors according to tidal height.
October 2, 2013

San Francisco Bay Basic Tide Model

This compressed data archive contains files that may be used to run a basic depth-averaged (2DH) Deltares (http://www.deltares.nl/en) Delft3D version 4.00.01 astronomic tide model for San Francisco Bay. It was developed with the primary aim of assessing water level fluctuations and flow conditions in the vicinity of

Map showing caldera features and caldera-related hazards at Medicin...

Map showing caldera features and caldera-related hazards at Medicin...

Green line (gas hazard zone limit) indicates elevation contour that defines the closed basin within the caldera, including Medicine Lake. In the event of significant volcanic gas emissions, the gases, which are heavier than air, could accumulate and potentially result in asphyxiation for anyone within the zone. It is likely that warning signs would be posted in such an

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Image: Southern California's Fire Landscape

Southern California's Fire Landscape

A screenshot from the USGS film "Living with Fire".

USGS is investigating ways to balance community fire risk management and native habitat conservation as part of the USGS Southern California Wildfire Risk Scenario Project, analyzing both human factors and natural factors.

Fire images courtesy of Tim Walton, Photo One Productions, CALFIRE. Shared with

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Map of the Inyo explosion craters, lava flows.

Map of the Inyo craters, lava flows

Map of the Inyo explosion craters, lava flows, and faults that formed about 600 years ago.

Image of the front page of Sound Waves, July 2011
March 22, 2019

Sound Waves, July 2011

The stories in the July 2011 issue of Sound Waves:

https://archive.usgs.gov/archive/sites/soundwaves.usgs.gov/2011/07/

Alaska Sea Otter Expedition Investigates Coastal Health

Field Journal: Pacific Nearshore Project Alaska Expedition, Day 7 

Dark image of a coastal area shows standard deviation of pixel density for 10 minutes, brighter areas mean more movement.

Sunset State Beach Video Camera 1 Variance Image

Variance image from video camera along Sunset State Beach in Watsonville, CA, looking northwest. This variance image shows the standard deviation of pixel intensity throughout a 10-minute video sequence. Learn more about the cameras and how we're using them to

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Columns formed by the cooling of basalt. Talus pile of broken colum...

Columns formed by the cooling of basalt, Long Valley Caldera region...

Columns formed by the cooling of basalt. Talus pile of broken columns at the base.

Image: Assessing the Health of a Sugar Pine in California

Assessing the Health of a Sugar Pine in California

USGS biologists assess the health of a sugar pine, one of tens of  thousands of individual trees whose fates have been tracked annually throughout the drought in California.