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PORTLAND, Ore. (AP) - A significant bulge in the earth's crust has developed over the past four years near volcanoes in central Oregon, but it's not clear whether it could mean a volcanic eruption any time soon, geologists said Tuesday. The bulge - nine to 12 miles across and about 4 inches high - was detected by satellite radar, said Willie Scott, a USGS scientist at the agency's volcano lab in Vancouver, Wash. "Because it's a volcanic area and there's been a long history of volcanic activity in that part of the Cascades, it's possible it might be magma, or molten rock, moving deep underground," Scott said. The bulge is located near the Three Sisters, a trio of volcanoes at the center of the Cascade Range in Oregon. The last major eruption in the Pacific Northwest occurred in May 1980, when Mount St. Helens blasted off about 1,300 feet of its top