The Brief

On a beautiful July day earlier this year, out of the blue, catastrophe visited residents of Rolling Hills Estates on the Palos Verdes Peninsula.

It’d been about four months since the last heavy rains, but the precipitation from one of the wettest years on record appears to have been working its way deep into the earth.

It appears that raindrops percolated through the silt and sand and past deposits of volcanic ash in the Altamira Shale, before settling on layers of montmorillonite rich clays, lifted from the ocean during the Pliocene some three million years ago.

An aerial view of upscale homes destroyed by a landslide on Palos Verdes Peninsula in July, 2023.

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It's possible that the particles of clay then took on the water, compromising the ability of the earth beneath the homes to stick together, leading them to separate like an unevenly stacked layer cake. The constituent parts of the neighborhood – the homes, streets and sewer – began to move, pulled by gravity down an embankment into the canyon below.

A preliminary report compiled for the city of Rolling Hills Estates by the geotechnical firm GeoKinetics said that a "high level of precipitation" was likely the main factor behind the slope failure. Though, it should be noted, other inquiries are ongoing.

If you know a bit about the area, landslides should come as little surprise, especially considering there are roughly 150 others that've have been documented there.

A view of upscale homes destroyed by a landslide on Palos Verdes Peninsula in July 2023.

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“Is the geology conducive to land sliding along the Palos Verdes Peninsula? The answer is yes,” said Jeremy Lancaster, state geologist and director of the California Geological Survey.

Given that another year of heavy rain might be on the way, influenced by a strong El Niño, what are the odds we’ll see even more homes sliding into canyons below?

Can we predict landslides?

There are two key types of landslides that you should be aware of: shallow and deep seated landslides.

The one's I'm usually on LAist screaming about are the shallow ones, particularly in hilly areas that've just burned. They're a bit more predictable because we know that after a fire, hillsides are covered in a waxy, water repelling layer and have had most of their vegetation removed. So, when rain falls from the sky, there's not much to slow it down, keep it from knocking dirt loose, picking up speed and turning into a huge destructive wall of water, like what we saw in Montecito in 2018.

When reporting on landslide risk during major storms, I'm usually on the lookout for recently burned areas anticipated to receive an inch of rain per hour, because heavy rainfall makes the shallow slides more likely.

Debris from a mudslide covers a home on January 10, 2018 in Montecito, California.

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Deep–seated landslides, like what we often see in the Palos Verdes Peninsula are a whole other beast,

We know that they typically need three things to occur: steep slopes, weak rocks and some sort of triggering mechanism, such as earthquakes or water (the peninsula has all three), to get them going.

But unless there's apparent movement on the surface, they're terribly difficult to anticipate because it's unclear what's going on deep in the ground. As soon as you're dealing with layer upon layer of material from different epochs all stacked upon each other, things get much more complex.

All it takes is one weak layer of water loving clay to give out between a whole bunch of big strong rock, for a whole hillside to come down.

Terrifyingly, a deep slide can occur months after a rainy season ends because it can take water a long time to slowly percolate through the earth to get to one of those weak layers.

"Because these landslides are at greater depths, it's really difficult geologically to have precise controls on when and how exactly that motion starts. But generally we expect that an above average rainfall seasons, particularly ones that are back to back, the probability or likelihood of motion is there," said Matthew Thomas, a research hydrologist with the USGS landslide hazards program.

It can take many cycles of wetting and drying for one of those weaker layers to become a problem.

Take for instance, bentonite clay found throughout the peninsula. According to Lancaster, while the clay is quite strong when it's dry, when it's wet it weakens and expands slightly, allowing for a slight amount of creep. Over time, cracks can grow and fill with water, further jeopardizing the hill structure. Add a whole bunch of weight and steep slopes and things can destabilize over time.

So if you can't predict a slide, what's there to look out for?

Listen for creaks and groans, look for evidence of movement, including broken water pipes and growing cracks.

It’s not always rain that’s responsible. Broken sewer or irrigation lines can also compromise layers and add weight to a hillside and cause it to give out.

Workers search for victims of a mudslide that left four people dead and 20 missing January 11, 2005 in La Conchita, California.

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What risk does El Niño bring?

El Niño is sometimes linked to wetter winters here in Southern California, which means more opportunity for water to percolate deep underground and destabilize hillsides.

There’s no guarantee that slides will follow a heavy rain year, but it does increase the risk that one will happen, especially in areas that’ve already seen slides, or have active slides ongoing.

According to the preliminary report prepared for the city, there were no earlier slides detected where the July 8 slide occurred in the Rolling Hills Estates area.

What can be done?

Preventing the percolation of water deep into the soil is key. Good surface drainage is an important. Concrete can be used to fill cracks that open up to prevent further infiltration. And in places like Abalone Cove, they've also installed dewatering wells, which actively pump water out.

At the behest of the city of Rolling Hills Estates, the homeowners association began winterization work in November, according to a letter provided by Assistant City Manager Alexa Davis. It includes various measures meant to clear water away from vulnerable parts of the hillside, including temporary drainage, grading and sandbags.

If you’re nervous about your property, you need to be on the lookout for growing cracks and listening for sounds of the earth moving. If your doors have suddenly fallen out of plumb and your windows aren’t opening, you may be facing a catastrophic issue.

If it’s not an emergency, but you're curious about what's going on beneath your home, hire an engineer to look at the geotechnical report relevant to your property.

For the last three years, the record store and music venue Healing Force of the Universe has been operating on a sleepy street corner not far from Pasadena City College. Nearby businesses include a shoe repair store, a nail salon and several auto shops.

“We're kind of in a dead corner,” owner Austin Manuel said. “No offense if anybody lives here, but not a very foot-trafficked area, kind of a hard place to have a store.”

In spite of the location, Manuel said Healing Force has become a home away from home for musicians and music fans. One of them is Bobby Bradford, a jazz trumpet legend who lost his house and personal archive in the Eaton Fire. He performs regularly at the venue. (Healing Force has also partnered with LAist on fire recovery events.)

Its current location is set to close this month, but Manuel and his team are already raising funds to cover a move to another space: G-Son Studios in Atwater Village. The repurposed ballroom was the Beastie Boys' home base when they recorded their classic albums Check Your Head and Ill Communication. Run-DMC and Biz Markie stopped by at one point, and Beck also laid down tracks for his album Odelay there.

Inside Healing Force's space in Pasadena.

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The vibe

Healing Force sells records, of course, but these days it’s more of a nighttime performance space. Manuel said he wants people to feel comfortable striking up conversations after a show.

“I grew up in the church in the South, and I was like, ‘How do I design this so that it feels like a Southern church lady could come in here and feel welcome?’" Manuel said. “ I didn't want it to be too cool.  I wanted it to feel kind of suburban in a way.”

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Though the name might call to mind a cult slogan — and Manuel said they lean into that aesthetic on purpose — it’s actually a reference to the 1970 album Music Is the Healing Force of the Universe by saxophonist Albert Ayler.

At the venue, “people can kind of get … into a meditative zone,” Manuel said. “After the [January 2025] fires, it felt so good to come back together in this room and feel the healing of community.”

Healing Force's stage setup.

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The performances

The shows Healing Force puts on share a common thread: They’re meant to promote peace and relaxation, as well as deep, careful listening on the hi-fi sound system. But they’re an eclectic mix of genres. On one night, you might see L.A. spiritual jazz band Phi-Psonics, who turned a residency at the venue into a live album, Expanding to One.

On another night, you might catch a spaced-out electronic set, an up-and-coming singer-songwriter or a group of session musicians who’ve played with the likes of Paul Simon, Elton John and Lucinda Williams.

About the fundraiser

With the new space on Glendale Boulevard, Manuel said, Healing Force would triple its capacity for concerts, get a bar space and be closer to other venues in Northeast L.A.

“If 1,000 people gave $25, we would get there,” Manuel said – though he also said most people have been giving more.

You can read more about the fundraiser and donate at Healing Force’s GoFundMe.

See the Pasadena space before it closes

The venue is still open at 1200 E. Walnut Street and is holding events through this Halloween weekend. You can see their events calendar on their website.

The racist DNA of Jim Crow discrimination may be embedded in your housing documents.

The language in housing documents that restricts sale or use of a property only to a person of the white race is called a “restrictive covenant,” and in California the practice goes back to the 19th century and continued into the mid-20th century. While housing discrimination persists, the practice was found unconstitutional in 1948.

California counties are reporting mixed progress in meeting the demands of a 2021 law to excise the language from property records.

According to Sylvia Manzo, deputy recorder in the Orange County Clerk-Recorder’s office, the county finished the job in March of this year, removing racist language from more than 27,000 property documents with the help of computer software.

This 1924 property document from Bakersfield includes racist language limiting use of the property in question to people of "the white or Caucasian race."

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L.A. County is far from done. It says that with the help of an outside company hired in 2024, 50 million pages will be examined yearly, which would take about 10 years to finish the job.

Public agencies could use the public’s help.

Language examples

Here’s a 1924 example from a property in Bakersfield. The text reads, “That the lands herein conveyed shall never, at any time, be sold to or rented to or occupied by any person not of the white or Caucasian race.”

Or this language from a 1936 document relating to a Costa Mesa property: “That said premises shall not be sold, conveyed, rented, or leased to, or occupied by any person of African, Mexican, or Asiatic descent.”

How to get it taken out

The Restrictive Covenant Modification Form is at the heart of the effort to remove the racist language from housing documents. Each county has its own process. Some charge a fee; others don’t. Some require a notary certification for the signature; others don’t.

L.A. County:

Registrar-Recorder officials recommend these steps:

• Highlight or underline the unlawful provision on the recorded document
• Complete the Restrictive Covenant Modification Form
• Submit the form and the recorded document by email: RCM@rrcc.lacounty.gov or in person at the Norwalk headquarters at 12400 Imperial Highway in Norwalk
• Mail instructions are here.

Orange County:

The Orange County spokesperson says there may be some properties not caught by its software and urges the public to report them. Here’s the form

Riverside County:

Here’s the Riverside County form

San Bernardino County:

Here’s the San Bernardino County form

San Diego County:

Here’s the San Diego County form

Santa Barbara County:

Here’s the Santa Barbara County form

Ignoring the racist language in property documents, some say, reinforces the legacy of segregation, while taking steps to remove restrictive covenant language is a way individuals and organizations can repudiate policies that sought to discriminate.