Dave Krieg threw two touchdown passes in the third quarter and Joe Nash blocked a 45-yard field goal attempt by Chris Bahr with 4:26 to play tonight as the Seattle Seahawks edged the Los Angeles Raiders, 17-14, for their fifth straight National Football League victory.

Nash's block came after Krieg fumbled while scrambling and the Raiders' Bill Pickel recovered on Seattle's 25 with 5:54 left. But Los Angeles was stopped by a sack of quarterback Marc Wilson and Nash, the Seahawks' nose tackle, leaped high through the middle to block Bahr's kick.

The Raiders (7-4), who lost their third straight, got the ball back with 1:02 remaining. But their last drive ended when Ken Easley intercepted a pass by Wilson on Seattle's 23 on the game's last play.

The Seahawks (9-2), who had a string of 10 scoreless quarters ended when Marcus Allen scored in the second period, remained one game behind American Football Conference West-leading Denver.

Seattle, trailing by 7-0 at halftime, scored all its points in the third quarter. Krieg exploited Pro Bowl cornerback Lester Hayes twice for touchdowns, passing eight yards to Byron Walker and 20 to rookie Daryl Turner.

Norm Johnson kicked a 27-yard field goal for Seattle's first points.

The Seahawks, leaders in the NFL in takeaways, forced six turnovers, with Easley getting two interceptions and John Harris one in the fourth quarter. Easley has a league-leading seven interceptions this season. The six takeaways gave the Seahawks 50 this season, 29 interceptions and 21 fumble recoveries.

Allen accounted for both Los Angeles touchdowns on one-yard runs. His second came 1:22 into the fourth quarter, after safety Vann McElroy intercepted Krieg at the Seattle 27. That followed a fumble by Raiders' tight end Todd Christensen at the Seattle five. Frank Hawkins had fumbled at Seattle's 15 in the first half to prevent the Raiders from scoring then. They had not lost three straight since early in the 1981 season.

Seattle's game-winning touchdown came on a four-play, 63-yard drive that ended with Krieg's pass to Turner with 4:02 to go in the third quarter.

The Seahawks scored their first touchdown with 7:43 gone in that period, on a seven-play, 63-yard drive with Krieg finding Walker in the back of the end zone. Krieg completed 11 of 25 passes for 122 yards.

Johnson's field goal came 2:39 into the second half and followed Shelton Robinson's recovery of Allen's fumble on the L.A. 12.

The Raiders, who beat the Seahawks, 28-14, in Los Angeles five weeks ago, held a 7-0 halftime lead on a 10-play, 46-yard touchdown drive that ended in Allen's run with 5:11 gone in the second quarter.

The Seahawks did not get beyond their 32 in the first two quarters, when they had just three first downs and 46 yards.

Wilson, who badly bruised the thumb on his throwing hand in a loss to Chicago last week, appeared to have trouble throwing deep. He completed 16 of 34 passes for 169 yards and was intercepted three times.