In which U.S. state can you find this "ghost forest"?

This earthquake occurred in 1702 causing a massive tsunami in Japan that killed hundreds. The tsunami was well documented at the time but the cause remained a mystery until the ghost forests were found and studied. Studies determined the earthquake was between 8 and 9 on the Richter Scale. Subsequent studies determined that earthquakes of this magnitude occurred in the Pacific NW about every 200-300 years. A major earthquake is now considered over due.