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What’s shakin’ on York? Fault line extends under Eagle Rock, Glassell Park and Highland Park

Raymond fault runs under Highland Park

Raymond fault zone shaded in yellow | California Geological Survey

The bars, restaurants and boutiques of York Boulevard make it an epicenter of cool for Northeast L.A. But it turns out the street might also one day be the epicenter of an earthquake.

The Raymond fault extends further west than previously charted, according to three revised maps from the California Geological Survey of the Alquist-Priolo Earthquake Fault Zones. So this particular fault zone, which extends into the San Gabriel Valley, now includes includes new areas of Glassell Park, Eagle Rock and Highland Park, where it parallels York Boulevard.

The Raymond fault is responsible for the Pasadena earthquake of 1988. While that quake – with a magnitude of 5.0 – did no appreciable damage, the Southern California Earthquake Data Center says this fault could cause an earthquake as large as magnitude 7 – stronger than the magnitude-6.7 Northridge earthquake of 1994 that killed dozens of people.

Properties located in the Raymond fault zone receive extra scrutiny when it comes to new development. Anyone planning to construct a home, school or commercial building that would be occupied is required to find out if the structure is located on top of the fault, reports the L.A.Times.

Raymond Fault Zone – California Geological Survey

The good news (though this is not new information) is that the Raymond fault moves very slowly. Big ruptures happen on the surface only every 4,500 years, give or take, the SCEDC says. And according to the Southern California Earthquake Center, the last time this fault had a surface rupture was a mere 1,000 or 2,000 years ago.

You can find a detailed map of the Raymond fault zone here but be aware that it’s a large PDF file that might take a while to load depending on your internet connection.

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5 comments

  1. It’s interesting how the Raymond fault was shifted south all of a sudden — out of the hills where all the pricey homes now lie.

    Previously, it was along (E to W) La Prada, Eaton and Coringa. They’ve pushed it south to along the (suspected extinct) Meridian fault, or to the poorer properties on the flats around York Blvd.

    We hope the gentrifiers aren’t using their relatives or their own positions in the sciences to further profit off the poor…

  2. The Raymond fault has always been along Meridian. There is a different fault, Sierra Madre along the faults. Both are still there. Stop making up gentrification conspiracy theories, makes you look like a cooc!

  3. Phew! My house is 500ft outside of it. Barely made it!

  4. What an amazing report! If you’re a geology nerd, or just moonlighting as one, check out the report (follow the link given to the CA Geological Survey, and go to the narrative “FER”, not just the map) — http://www.conservation.ca.gov/cgs/rghm/ap/Pages/official_release.aspx — for the Los Angeles Quadrangle.

    It turns out that the location of the Sparkletts plant, the little rise that the Huntington Library sits on, and many other features of local geography, are all related to this fault. The first several figures in the FER above contain a bunch of detailed information on the west-to-east progression of the fault right through Highland Park.

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