ENERGY

Western Geophysical Sells Equipment Unit for $120 Million: The division of Beverly Hills-based Western Atlas Inc. has agreed to sell the unit that manufactures equipment used in hunting for oil through seismic, or sound, waves that map subterranean formations. Input/Output Inc. of Stafford, Tex., will pay cash for the business, which had 1994 revenue of $110 million. A Western Atlas spokesman said the company expects to buy future equipment from Input/Output but that outsourcing that unit will allow it to focus on the core business of conducting such seismic searches. Western Atlas, the former industrial automation and oil field information services businesses of Woodland Hills-based Litton Industries Inc., split off from the parent company just over a year ago.