Einsteins of the Month Nomination
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The sea cliff above north Del Mar Dog Beach shows every sign of instability, including fresh piles of slide debris lined up along its base.
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Another sign of instability for the less observant.
The small cave to the right was probably excavated by hydraulic or pneumatic overpressures generated when large high-tide waves bash the cliff face directly. One of several ways the cliffs here are undermined by the sea.
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Guess the sandstone face looked pretty solid to her. She walked her dog back and forth right next to it for a good 10 minutes.
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Of course, lots of people never look up. Maybe she didn't see all the telltale signs that the much softer upper part of the cliff face is actively crumbling.
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To be fair, she didn't have the benefit of a fresh pile of slide debris right in front of her.
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But her boyfriend did. Note the loosened material still waiting to fall above his head.
The slide risk isn't just theoretical. In 2018 or so, a slide buried and killed a family of 8 while they picnicked at the foot of a sea cliff a few miles north of here, totally without warning. Well, except for the nearby "stay back" signs like the one above.