The explosion late Sunday near the town of Dogubayazit, close to the border with Iran, damaged the pipeline, forcing authorities to cut the gas flow, a statement from the pipeline company, Botas, said.
It was not immediately clear what caused the explosion. Separatist Kurdish rebels have attacked pipelines close to the border with Iraq and Iran in the past as part of their campaign for autonomy.
Repairs to the pipeline were under way, the statement said. Botas did not say when the pipeline would be operational, but said gas supplies to clients would not be affected.
Iran is a major supplier of natural gas to Turkey, after Russia.
Representatives of the Israeli Defence Ministry responded to recent reports about the possible delivery of S-300 SAM systems from Russia to Syria. Israeli Defence Minister Avigdor Lieberman said that Israel would destroy those systems
Russia is to start supplying S-300 air defence systems to Syria in the near future. The shipments will be conducted free of charge