Unified Interior Regions

California

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Small red cinder cone erupted on top of Mammoth Crest, viewed from ...

Small red cinder cone erupted on top of Mammoth Crest, viewed from ...

The red basaltic cone was erupted on top of Mammoth Crest, and an accompanying lava flow spilled 200-300 m down the steep slope below the cone. The cone erupted between 126,000 and 64,000 years ago.

Simplified map of Long Valley Caldera showing several field stops i...

Long Valley Caldera showing several field stops in blue

Simplified map of Long Valley Caldera showing several field stops in blue.

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.

California Wildfires

Satellites have captured views of the numerous major fires burning in California.
An image acquired on November 9, 2018, from NASA’s MODIS sensor on the Terra satellite shows smoke pouring out of two major fires, the Camp Fire and the Woolsey Fire, which both ignited the day before.
In the north, the Camp Fire quickly became the deadliest wildfire in the state’s

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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.

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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Black and white outline of man holding a duckling with a transmitter on its back
June 20, 2019

Coloring Sheet: Duckling With Transmitter

A PDF copy of a coloring sheet showing a USGS scientist holding a mallard duckling with a transmitter attached to its back, based on an image taken in Suisun Marsh, California.

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 ten minutes of video that highlights the changes in the darkest pixel values in the video.

Sunset State Beach Video Camera 2 Dark Image

Dark image from video camera along Sunset State Beach in Watsonville, CA, looking north. This dark image shows the darkest 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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