TEHERAN - A strong earthquake measuring 5.1 on the Richter scale jolted southern Iran on Friday, state television reported.No casualties have been reported from the quake, which struck at 3:16 am (1146 GMT) with the epicentre outside the town of Shahr-e Babak in Kerman province. “The earthquake hit an uninhabited area in the desert so there has been no damage,” a local official identified only by his last name as Shojai told ISNA news agency.