OAKLAND, California (Reuters) - The tsunami generated by a massive earthquake in Japan could reach 6 feet when it hits parts of the northern California coast and force some evacuations, a state emergency agency spokesman said.

"It is very possible there may be some evacuations here," California Emergency Management Agency spokesman Jordan Scott said by telephone, adding that the far northern California area near the Oregon border was most likely to see big waves.

(Reporting by Peter Henderson; Editing by Doina Chiacu)