Tecolote Park. The sign explains that the tan and cantaloupe-colored rock on the left side of the fault is 50-million-year-old Eocene sandstone, while the putty-colored conglomerate on the right was formed only a half-million years ago.

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San Diego Earthquake Danger Zones

Mission Bay and San Diego Bay, western Mission Valley, Otay Valley, Mt. Soledad area - to name a few

“All river valleys are suspect,” she says — Mission Valley, the Sweetwater River Valley, the Otay River Valley, the Tijuana River Valley. “If you are in the Mission Valley area, have a high potential for liquefaction.”

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