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California

Photo of palm trees with lots of dead fronds in canyon in Alvarado Creek
Posted inNews

Iconic Palms Add to Fire Danger in Southern California

Megan Sever, Science Writer by Megan Sever 22 November 20196 October 2021

As fires burn across Southern California, researchers examine what role nonnative vegetation plays.

A collapsed portion of freeway after the Loma Prieta earthquake
Posted inNews

California Launches Nation’s First Earthquake Early Warning System

Jenessa Duncombe, Staff Writer by Jenessa Duncombe 24 October 20196 October 2021

The country’s first publicly available, statewide warning system could give California residents crucial seconds to duck and cover before a quake.

Side view of individual trees generated in a lidar image
Posted inNews

The Bigger They Are, the Harder They Fall

Richard Sima, freelance science writer by Richard J. Sima 18 October 201924 March 2023

New research tracking 1.8 million trees found that tall trees died at more than twice the rate of smaller ones toward the end of extreme and persistent drought.

High population density, a potential for large earthquakes, and basins that amplify seismic waves put downtown Los Angeles at risk
Posted inScience Updates

Exposing Los Angeles’s Shaky Geologic Underbelly

by R. W. Clayton, P. Persaud, M. Denolle and J. Polet 10 October 201928 October 2022

Current calculations might underestimate the susceptibility of Los Angeles to earthquake shaking, so researchers and volunteers are deploying seismic networks near the city to remedy a data shortage.

Green and brown pine trees in a forest
Posted inNews

Foretelling Forest Death from Above

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 7 October 20191 March 2023

A satellite-based early-warning signal may spot the start of a forest’s decline and give forest managers more time to save its life.

Satellite image of the central California coast with wildfire smoke
Posted inNews

Golden State Blazes Contributed to Atmospheric Carbon Dioxide

Rachel Crowell, Science Writer by Rachel Crowell 27 September 201913 February 2023

A new case study investigates causes and effects of California’s 2017 wildfire season.

Map of southern California showing relationship between observed foreshock prevalence and magnitude of completeness
Posted inEditors' Highlights

Most Southern California Mainshocks Follow Foreshocks

by G. P. Hayes 19 September 20196 October 2021

New research using a highly complete earthquake catalog shows that 72% of M4+ mainshocks are preceded by foreshocks, implying that foreshock activity is much more prevalent than previously thought.

Map of landslide activity in California between April 2016 and February 2018
Posted inEditors' Highlights

Landslide Activity Ramps Up With Extreme Rainfall

by Amy E. East 29 July 201923 January 2023

An increase in activity of hundreds of slow-moving landslides during extreme wet conditions in California provides insights into the landscape response to ongoing climate change.

Sandhill cranes fly through the tule fog in the Merced National Wildlife Refuge
Posted inResearch Spotlights

Fading Air Pollution Reduces Fog in Central Valley

Aaron Sidder, freelance science writer by Aaron Sidder 12 June 20197 February 2024

The tule fog in California’s Central Valley is notorious for causing delays and accidents throughout the region; however, a decrease in air pollutants is reducing the fog’s frequency.

The Bishop Tuff in California
Posted inResearch Spotlights

Paleomagnetism Indicators May Be Flawed

Aaron Sidder, freelance science writer by Aaron Sidder 3 June 201914 March 2023

A new study finds that magnetism in volcanic ash tuff forms through varied processes, calling into question previously reliable signatures used to study variations in Earth’s magnetic field.

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A view of a bridge, with the New Orleans skyline visible in the distance between the bridge and the water. A purple tint, a teal curved line representing a river, and the text “#AGU25 coverage from Eos” overlie the photo.

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25 November 202525 November 2025
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Echoes From the Past: How Land Reclamation Slowly Modifies Coastal Environments

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