Tsunamis generated by the magnitude 9 earthquake in Japan last March dragged 3-4 million tons of debris into the ocean. Scientists believe ocean currents are carrying some of the lumber, refrigerators, fishing boats and other objects across the Pacific toward the United States. Those scientists estimate up to 5% of the debris could begin arriving on the Oregon coast by early 2013. Nicholas Mallos, conservation biologist and marine debris specialist for The Ocean Conservancy, says the debris field is largely dispersed over a large area. He says the debris will likely spread as far north as Alaska and as far south as Oregon.