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Map: Where Landslides in California Quicken Their Pace

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Map: Where Landslides in California Quicken Their Pace


Source: NASA/JPL-Caltech

Data from Sept. 18 to Oct. 17, 2024

Along the sparkling coast of Southern California, a string of landslides creeping toward the sea has transformed the wealthy community of Rancho Palos Verdes into a disaster zone.

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New data from a NASA plane shows the widening threat of these slow-moving landslides, which have destabilized homes, businesses, and infrastructure like roads and utilities. Researchers at NASA’s Jet Propulsion Laboratory documented how the landslides have pushed westward, almost doubling in area since the state mapped them in 2007.

The landslides have also sped up in recent years. A month of aerial radar images taken by NASA in the fall revealed how land in the Palos Verdes Peninsula slid toward the ocean by as much as four inches each week between mid-September and mid-October. Before that, a city report showed more than a foot of weekly movement in July and August.

Source: NASA/JPL-Caltech

Present boundary includes areas where landslides moved faster than one centimeter per week between Sept. 18 and Oct. 17, 2024.

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The mass of slides in Los Angeles County, known as the Greater Portuguese Bend Landslide Complex, reactivated in 1956 after road construction destabilized the once-dormant slope. For decades, it slid just a few inches every year. But heavy rain in 2023 and early 2024 accelerated that movement, leading Gov. Gavin Newsom to declare a state of emergency, citing “conditions of extreme peril to the safety of persons and property.”

Homes in Rancho Palos Verdes began collapsing in June and August of 2023. Streets have fissured. Walls have shifted and floors have cracked open to reveal the dynamic earth below. A downed power line related to the slides started a small brush fire in August. A $42 million buyout program helps property owners voluntarily sell and relocate, but homeowner insurance policies do not typically cover landslides.

A stretch of coastline where landslides meet the beach in Rancho Palos Verdes.

Loren Elliott for The New York Times

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Damage in a residential area of Rancho Palos Verdes in August.

Loren Elliott for The New York Times

Mitigating such a disaster is extremely expensive. By the end of this fiscal year, the city said it will have spent more than $35 million, almost 90 percent of its general fund operations budget, on addressing the landslide. That includes the installation of 11 wells that have worked to pump out 145 million gallons of groundwater that could further destabilize the slope. The investment has yielded results: The landslide slowed by about 3 percent on average between December and February thanks to the wells and a lack of rain, the city said.

Slow-moving slides are common around the world, and especially in California, where several hundred have been mapped in coastal mountain ranges. Normally moving at a sluggish pace, these slides can grind nearly to a halt during the dry summer months before a wet winter makes them crawl again.

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But last summer, the landslide complex in Rancho Palos Verdes exhibited strange behavior when it failed to slow. The best guess for why has to do with a very wet 2023, said Alexander Handwerger, a research scientist at the NASA Jet Propulsion Laboratory who has studied the behavior of slow-moving landslides for well over a decade. Typically triggered tens of meters underground, they remain an ongoing area of research.

“Of all the things we know,” Dr. Handwerger said, “we know the least about what’s happening under the ground.”

Last week, other parts of Los Angeles County faced additional landslides, ones that move quickly, running at meters per second instead of centimeters per week. The National Weather Service in Los Angeles issued warnings for post-fire debris flows — a tangle of mud, rocks and trees that start on burn scars — ahead of heavy rainfall on Thursday. Los Angeles neighborhoods scorched by wildfires like the Eaton and Palisades fires last month faced some of the greatest dangers as those flows hit business and homes in Southern California.

But slower-moving landslides, like the ones in Rancho Palos Verdes, are more predictable. They ooze rather than race. They typically need a season of rain, rather than a single storm, to accelerate. And it’s extremely rare for them to suddenly collapse or slide in a catastrophic way.

It’s unclear what triggers that kind of sudden catastrophe, said Luke McGuire, an associate professor in geomorphology at the University of Arizona. He pointed to one of the few known examples of such an event, in 2017, when the Mud Creek Landslide in Big Sur gave way after eight years of stable sliding. More than 65 feet of rocks and dirt covered a quarter-mile of Highway 1, the scenic drive winding along the California coast.

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Experts say that the city of Rancho Palos Verdes probably will not experience that kind of sudden event. “You can never say never, but the likelihood that this would go into a catastrophic movement phase is quite low,” said Dave Petley, a landslide expert who collects global landslide data for the American Geophysical Union. “It’s likely it’ll continue to cause substantial property damage, but the risk of the thing suddenly sliding into the sea and taking everyone with it is not particularly high.”

A 2019 Nature study by Dr. Handwerger showed that the Mud Creek Landslide could have been triggered by a shift from drought to record rainfall. In a warming world, an increase in extreme rain events could cause more landslides to quicken, according to the study.

More precipitation could also cause more landslides to emerge from hibernation into slow-moving slides.

“Rainfall under climate change can wake a landslide back up,” Dr. Petley said, adding that a vast number of dormant landslides with this potential exist across the globe.

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California

Smoldering legacy: A toxic fire prompts new safety rules as California’s green-power shift speeds ahead

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Smoldering legacy: A toxic fire prompts new safety rules as California’s green-power shift speeds ahead


It’s been 16 months since a massive fire tore through one of the world’s largest lithium-ion battery storage facilities in rural Monterey County, spewing toxic gas into the air as it smoldered for several days, and, even today, cleanup is far from complete.

It will take at least several more months, and possibly another year, before the charred, waterfront power plant owned by Texas-based Vistra Corp. is cleared, Monterey County Supervisor Glenn Church said.

The process is slow because it is dangerous, with thousands of batteries yet to be removed and crews working carefully to avoid reigniting a fire. “Of course, quicker would be better, but safety has to be first,” Church said.

The blaze in Moss Landing provoked hostility toward battery projects in California, where state officials are pursuing an aggressive goal of 100% clean energy usage by 2045 to increase the grid’s capacity and combat the catastrophic effects of climate change.

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A safe energy transition

Battery energy storage systems hold excess energy generated during the day — by solar panels, for instance — and release it into the power grid during times of high demand, including evening hours. California has invested heavily in battery storage, which, my colleague Hayley Smith reported, grew more than 3,000% from 500 megawatts in 2020 to more than 15,700 megawatts in 2025.

A new bipartisan bill introduced this month in the U.S. House of Representatives aims to keep this transition safe.

The Better Energy Storage and Safety Act would dedicate federal funding of $30 million annually over the next five years toward research and stress testing for the systems.

It was authored by Rep. Jimmy Panetta, a Democrat whose Central Coast district includes Moss Landing, and co-led by Rep. Pat Harrigan, a North Carolina Republican.

Despite efforts by the Trump administration to stymie green energy, Panetta said in an interview, “you have to accept the reality of renewables … That’s why we want to ensure that it’s as safe as possible.”

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A fast energy transition

The Moss Landing fire has represented the proverbial elephant in the room in the midst of California’s rapid energy transition, Church said.

He has called for more local control over where battery systems are built and been a vocal advocate for more safety regulations, saying the catastrophe in Moss Landing should be learned from, not written off as “an inconvenient accident.”

With proper engineering, lithium-ion battery storage sites pose little risk of catching fire, Shirley Meng, a molecular engineering professor at the University of Chicago and internationally known battery expert, told me last fall. She said safety has improved dramatically in recent years and that the failure rate is about 1 in 10 million for all types of lithium-ion batteries.

California is now speeding review for large-scale renewable energy projects through a new fast-track permitting program that does not require sign-off from county and municipal governments — a fast-track process that Church has criticized.

Last fall, Gov. Gavin Newsom signed a new state law — prompted by the Moss Landing accident— that requires battery storage safety standards and requires developers to coordinate closely with local fire departments.

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Stacey Shepard, a spokesperson for the California Energy Commission, said in an email that “today’s battery systems are governed by rigorous safety standards,” use improved technology and “are placed in outdoor containers rather than inside buildings,” unlike in Moss Landing site.

The cause of the Moss Landing fire is still under investigation

Firefighters let it burn for days, citing the dangers of dousing lithium-ion battery fires with water, which can cause dangerous chemical reactions.

The blaze ignited inside a former turbine building that contained a 300-megawatt system made up of about 4,500 cabinets, each containing 22 individual battery modules, according to Vistra Corp.

Of the 99,000 individual LG battery modules in the building, about 54,450 burned, according to Vistra. Justin Daily, a spokesman for the company, said in an email that as of May 8, more than 31,000 battery modules had been removed, de-energized and shipped to recycling facilities.

“We are now working to enable safe access to batteries in the damaged portion of the building,” he said.

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Today’s top stories

A bird flies by a plume of smoke from the Sandy fire off Redwood Grove Court in Simi Valley.

(Kayla Bartkowski / Los Angeles Times)

Multiple wildfires trigger unhealthful air quality alert in SoCal

Apartment scouts are on the rise in Los Angeles

  • They aren’t real estate agents or brokers. Rather, they are savvy entrepreneurs who tour apartments, share listings online and, in some cases, work one-on-one with clients to find a place that fits their specific aesthetic and budget.
  • The demand for apartment scouts highlights the pressures of L.A.’s competitive rental market, where vacancies are scarce and rental rates are among the highest in the country.

What else is going on

Commentary and opinions

This morning’s must-read

Another must-read

For your downtime

Concept art showing a ship soaring through a gas planet.

On May 22, Disneyland’s Millennium Falcon: Smugglers Run will include a new mission as well as new destinations such as the gas-like locale of Bespin, seen here in concept art provided by Disney. The tweaks are tied to the film “The Mandalorian and Grogu.”

(Disney Parks)

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Going out

Staying in

Question of the day: Sticker shock: Send us examples of California houses with sticker prices that truly shocked you.

Is it worse than this burnt-out three-bedroom in Torrance that sold for over $1 million?
Email us at essentialcalifornia@latimes.com, and your response might appear in the newsletter this week.

And finally … the photo of the day

A firefighter clears brush during the Sandy fire

A firefighter pauses while clearing brush in the Sandy fire in Simi Valley.

(Kayla Bartkowski / Los Angeles Times)

Today’s photo is from Times photographer Kayla Bartkowski on a hill in Simi Valley near the Sandy fire, one of multiple blazes consuming more than 20,000 acres.

Have a great day, from the Essential California team

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Hailey Branson-Potts, staff reporter
Hugo Martín, assistant editor, Fast Break desk
Kevinisha Walker, multiplatform editor
Andrew J. Campa, weekend writer
Karim Doumar, head of newsletters

How can we make this newsletter more useful? Send comments to essentialcalifornia@latimes.com.



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They used to battle in CA elections. Now, they back the same candidate

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They used to battle in CA elections. Now, they back the same candidate


Which of these is least likely?

Kendrick Lamar and Drake squashing their feud?

Giants fans and Dodgers fans sharing high-fives? 

Or California charter schools endorsing the same candidate for superintendent as the state’s largest teachers’ union?

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If you remember the 2018 election, you’d probably vote for the pigs-flying scenario of the California Charter Schools Association and the California Teachers Association being on the same page in an election year. Back then, advocates for both sides shelled out tens of millions of dollars in the contest between union-supported Tony Thurmond and charter school-backed Marshall Tuck. Thurmond came out ahead. 

But this year, both associations are rallying behind candidate Richard Barrera: Four months after the teachers’ union announced its endorsement of the president of the San Diego Unified school board, the charter schools association this week said it’s backing Barrera too — a move Barrera told me “came as a bit of a surprise.”

He pointed to two attributes of San Diego schools that might explain how the usually competing groups came to support his candidacy. First, unlike in other regions, the politics surrounding San Diego school board races or other education issues did not typically pit “charters versus union.” In fact, the percentage of students attending charters grew while he was on the board. 

And second, the school board included charters when it distributed money to improve school facilities. That experience working on local facilities bonds established “a unique relationship between the charter and public schools that CCSA has told me that doesn’t exist in most places,” Barrera said.

In a statement, Gregory McGinity, the executive director of the charter association’s lobbying arm, said Barrera, “has shown that supporting educators and supporting high-quality charter public schools are not mutually exclusive.” 

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But don’t expect both groups’ backing of Barrera to mean they will agree with each other in the future. CTA President David Goldberg told me that while the union didn’t endorse Barrera to build a coalition with charters, he didn’t find the charter association’s support of Barrera “shocking” either.

  • Goldberg: “Sometimes even people who don’t see things the same way … we still want someone who is very capable running this department. That benefits all students.”



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New police video shows deadly standoff after deputy killed in California shooting | Fox News Video

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New police video shows deadly standoff after deputy killed in California shooting | Fox News Video


Bodycam and drone video show the deadly SWAT standoff after Tulare County Deputy Randy Hoppert was killed serving an eviction notice. Credit: Kern County Sheriff Office



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