By Larry Fine EAST RUTHERFORD, New Jersey (Reuters) - The Seattle Seahawks' ferocious defense shut down the Denver Broncos and record-setting quarterback Peyton Manning in a 43-8 rout on Sunday to claim their first Super Bowl title. Seattle, the NFL's top-ranked defense, turned two interceptions into second-quarter touchdowns for a 22-0 lead at intermission, the second coming on a 69-yard interception return by linebacker Malcolm Smith. The Seahawks also recovered two fumbles in the lopsided contest that gave them their first Super Bowl crown in their 37 seasons.