BIRJAND -- A minor earthquake, measuring 3.9 degrees on the open-ended Richter scale, shook parts of the northeastern city of Birjand in Khorasan Province early Tuesday morning.

The Seismological Center of Khorasan, affiliated to the Geophysics Institute of Tehran University, recorded a quake at 01:47 hours (2117 GMT), 400 kilometers from the provincial capital city of Mashhad.

There has been no report yet on probable casualty or property damage.

Meanwhile, another quake, with an intensity of 3.4 degrees, struck the town of Behabad in the central Yazd Province at 9:15 hours Tuesday, the Seismological Base of Yazd said. The tremor caused no damage.

On Monday, an earthquake, measuring 3.8 degrees, hit the city of Tabas, which is located not far away from Behabad.

At least 25,000 people were killed in a 7 plus-degree earthquake which struck Tabas in September 16, 1978.

Due to sitting on some of the world's seismic fault lines, Iran is one of the most quake-prone countries in the world with mild tremors often occurring.

An official has reported that as of 1991 over 950 earthquakes have jolted Iran resulting in the death of 17,600 people and injury of 53,300 others.