Original: On May 10, 1997, Northern Iran's Khorasan Province was struck by a major earthquake known as the Qayen, Ardekul or Qaen earthquake.
Simplified: The 1997 Qayen earthquake was a large earthquake that struck in Northern Iran's Khorasan Province on May 10, 1997. It was also known as the Quayen, Ardekul or Qaen earthquake.