John Tonelli's 100th National Hockey League goal highlighted a four-goal first period last night as the New York Islanders defeated the Quebec Nordiques, 4-1.

The victory marked the first time the Islanders have won two in a row since Oct. 28 and Oct. 30, when they beat New Jersey 4-2 and 8-5. On Tuesday, the three-time defending Stanley Cup champions beat Buffalo 5-2.

The Islanders sent 21 shots to goalie John Garrett in the first period. Tonelli, Tomas Jonsson, Mike McEwen and Greg Gilbert each got one in.

Tonelli opened the scoring at 1:51 when he knocked in a rebound of his own shot for his 14th goal of the season. New York made it 2-0 when Jonsson hit a 50-foot slapshot on a power play at 6:31.

McEwen converted a pass from Mike Bossy with the Islanders holding a four-on-three skating advantage at 10:29. Then Gilbert, a rookie left wing, took pass from behind the net by Butch Goring and got his third goal.

Quebec got on the board with 1:27 remaining in the second period when Anton Stastny wheeled in the Islanders zone and fired a 30-footer past Roland Melanson. The Islanders added a pair of third-period goals. Bossy took a pass from Tonelli and swept in a 35-footer at 6:49 and defenseman Dave Langevin connected a minute later with a shot from the blue line.

The Nordiques, who have never won here, are now 0-6-1 at Nassau Coliseum. They wrer outshot 49-25.