A 5.8 magnitude earthquake struck southern Iran today. No casualties were reported. The quake shook southern provinces of Fars, Hormuzgan and the Kish Island in the Persian Gulf. The USGS placed the epicenter of the moderate quake 160 kilometers (100 miles) south of the city of Jahrom. Iran sits astride several major fault lines and is prone to frequent quakes. In December 2003, a 6.3 magnitude quake hit the southern historical city of Bam, killing 31,000.