Since the apparent sea slope along the Pacific coast between San Diego, California, and Neah Bay, Washington, was originally reported by Bowie in 1929, numerous points of view have been expressed in literature concerning this possibility. A recent interpretation proposes a complete agreement between geodetic and steric leveling. Another geodetic study shows a time variation of sea slope over a decade, suggesting a possible rise of San Pedro with respect to San Francisco (or San Francisco subsiding with respect to San Pedro) at an average rate of about 8 cm/yr. However, tidal records do not reveal large changes in the trend of mean sea level relative to land at the tide stations.
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