The coastal portion of the state of California is generally subsiding at a rate of 1 to 4 millimeters per year.  At the same time, it is generally understood that absolute sea level,  often called  “global sea level”,  is rising at about 2 to 3 mm/yr [when using global tide gauges for the calculation].   In effect then, Relative Sea Level Rise along much of the coast of California can be said to be ‘doubled’ by subsidence.