The California coast is moving eastward, but only about three or four centimeters every year. Japan moves three centimeters a year due to activity along the boundary between two tectonic plates off the coast. Tectonic movement in Taiwan is clipping along at twice that pace.
比起美國西岸，加州外海到內華達州每年不過移動三、四公分；日本因為板塊交接帶在外海，每年移動三公分，速度都只有台灣的一半。