A strong earthquake centered in Iranian Kurdistan shook the Caspian Sea region early Sunday . One report said the quake measured 6.5 on the Richter Scale , and another said 5.6 . Teheran and other cities in northern Iran were jolted . There was no word on casualties . It was the third temblor in that region in the last five days . Iran is shaken by hundreds of earthquakes every year that measure from 2.5 to 5.5 on the Richter Scale and most do little damage . The last major quake in Iran happened in September 1978 . The Richter scale is a measure of energy released by an earthquake as recorded on seismographs. It measured 6 and caused 25,000 deaths .
A strong earthquake centered in Iranian Kurdistan shook the Caspian Sea region early Sunday . One report said the quake measured 6.5 on the Richter Scale , and another said 5.6 . Teheran and other cities in northern Iran were jolted . There was no word on casualties . It was the third temblor in that region in the last five days . Iran is shaken by hundreds of earthquakes every year that measure from 2.5 to 5.5 on the Richter Scale and most do little damage . The last major quake in Iran happened in September 1978 . It measured 6 and caused 25,000 deaths .