In 1929, a sizeable section of land in the southern tip of San Pedro began to unexplainably slip into the sea. The 600 block of Paseo Del Mar began moving seaward in 1929 and continued to slip until the mid 1930s. Movement was measured as high as 11 inches a day. Due to quick action, all but two of the houses on the seaward side of the street were moved before toppling into the sea. The eastern section of Point Fermin Park was lost and the entire area is very unstable, yet not moving at the present time.
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Geologists have termed this phenomenon as a "slump" and this area has been featured in many geological studies and books.
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