"Sea-level measurements collected at Fort Point in San Francisco since before 1900 form the
longest continuous sea-level record for any site on the west coast of North America. This record was
recently analyzed by U.S. Geological Survey scientists, who found that four major factors influence
sea level at Fort PointΡdaily tides, annual sea-level cycles, a long-term trend of slowly rising
sea level (red line), and the occurrence of atmospheric events such as El Niρos and La Niρas."
It is possible that the measuring station itself was on a section of land that sunk this much
in 100 years, and not that the sea level rose that much during this time.
Additional data from other locations, both in San Francisco, other locations in California, and
elsewhere in the world need to be compared before conclusions can be drawn about global
phenomenon.
-- Sterling D. Allan, July 16, 2003
