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Hydrothermal system and water flow in the subsurface beneath Long V...

Hydrothermal system and water flow in the subsurface beneath Long V...

Hydrothermal system and water flow in the subsurface beneath Long Valley Caldera, California. Cartoon Illustration from USGS FS 2007-3045.

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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Map showing Medicine Lake volcano lava flows 100,000 years old and ...

Map showing Medicine Lake volcano lava flows 100,000 years old and ...

Postglacial lavas ~13,000 years old and younger are shown in darker pink. Major lava flows are labeled, including anr (andesite of north rim) and asr (andesite of south rim). Five very large basalt lava flows are also labeled: bgc = basalt of Giant Crater, bmc = basalt of Mammoth Crater, byb = basalt of Yellowjacket Butte, bl = Lake Basalt, and bt = basalt of Tionesta.

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

Sound Waves, March 2011

The stories in the March 2011 issue of Sound Waves:

https://archive.usgs.gov/archive/sites/soundwaves.usgs.gov/2011/03/

Japan Lashed by Powerful Earthquake, Devastating Tsunami

Long-Lived, Slow-Growing Corals in Deep Waters of the Gulf of Mexico

Image of ten minutes of video that highlights the brightest pixel values in the video, like the wave froth on the beach.

Sunset State Beach Video Camera 1 Bright Image

Bright image from video camera along Sunset State Beach in Watsonville, CA, looking northwest. This bright image shows the brightest pixel values throughout a 10-minute video sequence. Learn more about the cameras and how we're using them to study coastal change

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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.

A view from atop a building looking at the sandy beach, waves, and ocean.

Cowells Beach Webcam Snapshot

Video camera snapshot at Cowells Beach in Santa Cruz, California, looking southward. Learn more about the cameras and how we're using them to study coastal change.

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