Israel on Sunday offered its assistance to Turkey after a 7.3 magnitude earthquake struck the eastern part of the country, despite ongoing tensions between the formerly close allies.

Israel's defence ministry is preparing to offer Turkey "any aid they might need," Defence Minister Ehud Barak's office said. The Israeli embassy in Ankara has also offered the Turkish government humanitarian aid, the foreign ministry said in a statement.

An embassy spokesman said Israeli President Shimon Peres has called his Turkish counterpart Abdullah Gul, adding: "Peres expressed his sympathy regarding the recent earthquake and offered any help needed."

Eastern Turkey was struck by a 7.3 magnitude earthquake on Sunday afternoon, which the country's seismological institute said may have killed between 500 and 1,000 people.

Ties between Israel and Turkey, once strong allies, have been strained since May 2010, when Israeli naval commandos stormed a flotilla trying to sail to Gaza in defiance of a blockade, killing nine Turks.

The crisis deepened last month, with Turkey expelling the Israeli ambassador and axing military ties and defence trade.

But the two countries have maintained a tradition of offering each other assistance in times of need, despite the frayed relations.

In December, Turkish Prime Minister Recep Tayyip Erdogan dispatched firefighting planes to Israel to help tame a forest fire which killed 44 people, and sent aid to victims of the blaze.

In 1999, relations between the two countries were cemented in part by the aid which Israel sent to assist in the aftermath of two massive earthquakes in northwest Turkey that killed some 20,000 people.