SEATTLE — Marshawn Lynch ran for two touchdowns and added a 7-yard touchdown catch, and the Seahawks got a leg up on the NFC West race with a 29-3 victory over the 49ers on Sunday night.
The Seahawks forced five turnovers, the most by the 49ers under coach Jim Harbaugh, and cruised on coach Pete Carroll's 62nd birthday.
The game got off to a wild start with dueling interceptions, an hourlong lightning delay and a safety before the first half ended.
Both second-year quarterbacks completed less than 50 percent of their passes. Seattle's Russell Wilson completed 8-of-19 for 142 yards and a score, and San Francisco counterpart Colin Kaepernick was 13-of-28 for 127 yards and three interceptions.
Lynch rushed for 98 yards on 28 carries.
Wilson found Lynch in the end zone with 13:44 to go in the game to extend Seattle's lead to 19-3. Lynch scored on the ground from 14 and 2 yards.
The Seahawks went ahead 2-0 in the second quarter when 49ers fullback Bruce Miller was flagged for holding in the end zone. Seattle went up 5-0 when Steven Hauschka kicked a 30-yard field goal with 5:52 left.
On their second series, the 49ers capitalized on field position from a blocked punt, but on third down at the Seattle 5, Kaepernick's pass to Vernon Davis in the end zone was tipped and intercepted by safety Earl Thomas.
Wilson was intercepted by San Francisco safety Eric Reid on a long pass meant for Golden Tate.
The fan group attempting to set a Guinness World Records mark for loudest stadium said it succeeded. The group called Volume 12 announced on its Facebook page it had set the mark in the first quarter at 131.9 decibels.