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California

Researchers trace the history of California’s Whipple Mountains and find a new relationship between normal and detachment faults.
Posted inResearch Spotlights

On the Origin of Low-Angle Detachment Faults

by Terri Cook 7 March 20176 October 2021

Data from California's Whipple Mountains suggest this complex was formed by a succession of steep normal faults, challenging the paradigm that detachments are different types of faults.

Snow drought, seen here on slopes that should have snow.
Posted inOpinions

Defining Snow Drought and Why It Matters

by A. A. Harpold, M. Dettinger and S. Rajagopal 28 February 201723 January 2023

Swings from snow drought to extreme winter rainfall make managing reservoirs, like the Oroville Dam, incredibly difficult. But what exactly is "snow drought"?

Mineral layers offer a key to examine the behavior of individual magma pulses in volcanic arcs.
Posted inResearch Spotlights

Pulses of Rising Magma in Sierra Nevada's Past

by Terri Cook 3 February 20177 March 2023

A detailed study of layered igneous material at California's Fisher Lake offers a novel approach to identifying the pathways and timescales of individual magma pulses in volcanic arcs.

California governor Jerry Brown addresses a roomful of scientists at AGU’s 2016 Fall Meeting.
Posted inNews

California’s Governor Promises to Fight for Science

JoAnna Wendel, freelance science writer and illustrator by JoAnna Wendel 14 December 20166 October 2021

Scientific efforts must ratchet up in the face of rising climate change denial, Governor Brown said to a roomful of scientists.

Low water levels in Uvas Reservoir in California, March 2014.
Posted inNews

U.S. Winter Outlook Sees No Drought Relief

by S. Lemonick 24 October 20166 February 2023

A weak La Niña is expected to further dry out southwestern and Gulf Coast states.

Lake Oroville shows the effects of California’s extended drought.
Posted inScience Updates

Climate Change, Groundwater Management, and California's Future

by E. White, E. E. McClenny and M. C. Pinheiro 30 September 20166 October 2021

Conference on Climate Change and the Sustainable Groundwater Management Act; University of California, Davis, California, 4–5 April 2016

modeling-heat-source-hydrothermal-reservoir-long-valley-caldera
Posted inResearch Spotlights

Mapping Water and Heat Deep Under Long Valley Caldera

Leah Crane by L. Crane 29 September 201611 January 2022

Researchers use electrical resistivity to find the heat source and reservoir feeding Long Valley Caldera's labyrinthine hydrothermal system.

white-moon-cave-santa-cruz-california
Posted inNews

Subterranean Caverns Hold Clues to Past Droughts

JoAnna Wendel, freelance science writer and illustrator by JoAnna Wendel 31 August 20167 March 2023

Cave formations offer highly resolved paleoclimate data that scientists plan to use to reconstruct California's ancient patterns of drought.

Rain over California’s Owen’s Valley in early May 2016. The 2015–2016 El Niño, which officially ended in late May, was one of the strongest El Niños on record.
Posted inResearch Spotlights

Monster El Niño Not Enough to Quench California Drought

by Lauren Lipuma 15 July 20167 March 2023

New research shows that the Sierra Nevada snowpack will likely not recover from the current drought until 2019.

Iron Gate Dam on the Klamath River near Hornbrook, Calif
Posted inNews

Controversial Pacts Aim for Dam Removals on Western U.S. River

by Randy Showstack 11 April 201615 February 2023

New agreements regarding the Klamath River in Oregon and California would enable the largest U.S. dam removal project ever. Critics say water quality will suffer, decry hydropower loss.

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