Unified Interior Regions

California

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Bishop Tuff road cut north of June Lake, Long Valley Caldera, Calif...

Bishop Tuff road cut north of June Lake, Long Valley Caldera, CA

The Long Valley Caldera was formed 760,000 years ago when 600 cubic kilometers (150 cubic miles) of magma (molten rock) was erupted over the period of six days. As the magma was ejected, the roof of the magma storage region collapsed forming a 17 by 32 km (9 by 18 mile), oval-shaped depression known as the Long Valley Caldera. The deposits from the large eruption are

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The false-color aerial photo shows Cinder Cone and its related vol...

The false-color aerial photo shows Cinder Cone and its related vol...

The false-color aerial photo shows Cinder Cone and its related volcanic deposits as barren gray areas.

Mammoth Mountain (USGS photo, Mangan)...

Mammoth Mountain (USGS photo, Mangan)

Mammoth Mountain is a popular recreation area in the Eastern Sierra Nevada mountains, and is one of California's major volcanoes. The town of Mammoth Lakes is tucked up next to the volcano. It lies on the edge of the Long Valley Caldera, and at the southern end of the Mono-Inyo chain of lava domes and craters. The area generates a large amount of geothermal energy—note

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Lassen Peak with the Loomis Hot Rock in the foreground, 1915 and 19...

Lassen Peak with the Loomis Hot Rock in the foreground, 1915 and 1984.

(left image) Lassen Peak, 1915, and devastated area with the Loomis Hot Rock in the foreground. The rock was ejected from the volcano during the 1915 event and was too hot to touch for several days after the eruption. (right image) Photograph from the same location in 1984 with Hot Rock surrounded by trees and Lassen Peak in the background.

Vegetation in foreground up on a beach bluff above flat beach with waves gently lapping, sky is cloudy in distance.

Sunset State Beach Video Camera 1 Snapshot

Snapshot from video camera along Sunset State Beach in Watsonville, CA, looking northwest. The snapshot is the first frame of a 10-minute video sequence. Learn more about the cameras and how we're using them to study coastal change. [

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Deer Mountain is a post caldera rhyolite that erupted outside the L...

Deer Mountain is a post caldera rhyolite that erupted outside the L...

Deer Mountain is a post caldera rhyolite that erupted outside the Long Valley Caldera about 115,000 - 97,000 years ago.

Image: California Condor

California Condor

California condors are one of the most endangered birds in North America. In the early 1990s, captive-bred condors were reintroduced into the wild in California. As of January 2010, about 190 condors now live in the wild and more reintroductions are being considered. To facilitate this, USGS researchers are assisting Fish and Wildlife Service in its condor research program

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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 

Lidar images of Shastina cone, west flank of Mount Shasta, Californ...

Lidar images of Shastina cone, west flank of Mount Shasta, CA. Deta...

Lidar images of Shastina cone, west flank of Mount Shasta, California. Details of lava flows and other surficial features are best seen in the image to the right with vegetation removed.

View looking west-southwest toward Chaos Crags from the south shoul...

View looking west-SW toward Chaos Crags from the south shoulder of ...

Domes of Chaos Crags are unglaciated and thus retain their blocky carapaces. Forested slopes in center are mantled by pumiceous pyroclastic-flow and fall deposits from Chaos Crags, overlying a lateral moraine dominated by material removed from Lassen Peak. Dome A is not visible in this view.

Coastal vegetation in foreground along beach bluff near flat beach with waves gently lapping, sky is cloudy in distance.

Sunset State Beach Video Camera 2 Snapshot

Snapshot from video camera along Sunset State Beach in Watsonville, CA, looking north. This snapshot is the first frame of a 10-minute video sequence. Learn more about the cameras and how we're using them to study coastal change. [

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