A 5.9 magnitude earthquake hit southwest Iran along the Persian Gulf.
There were no immediate reports of damage or injury.
Iranian state television said the quake had a magnitude of 5.9. An aftershock of magnitude 4.5 followed.
The US Geological Survey named it a 5.8 magnitude earthquake in the port city of Bandar Genaveh. It described its depth at 10 kilometers.
A magnitude 5 earthquake can cause significant damage. Shallow earthquakes also have greater damage.
Iran has large seismic disturbances and experiences an average of one earthquake per day. In 2003, a 6.6 magnitude earthquake hit the historic city of Bam, killing 26,000 people.
A magnitude 7 earthquake in western Iran in 2017 killed more than 600 people and injured more than 9,000.