The 1977 Naghan earthquake struck Chaharmahal and Bakhtiari province in Iran on April 6 at 13:36 UTC.

The earthquake measuring 6.0 Mw  occurred at a depth of 15 km (9.3 mi) and had a maximum Modified Mercalli intensity of VIII (Severe).

Iran is a region that accommodates oblique convergence through thrust and strike-slip faults with clear geomorphic expression at the surface.

Beginning in the Miocene or Cenozoic, continental collision involving the Arabian plate and Central Iran formed the 1,200 km (750 mi)-long Zagros Mountains.

Approximately 30–50 percent of the ~25 cm (9.8 in)/yr convergence between the Arabian and Eurasian plates is accommodated along the Zagros.

The KBF fault accommodate the different rate of convergence between the northwestern and southeastern belt.

It displayed a both reverse and strike-slip focal mechanism but no surface ruptures were identified.

Due to their brittle walls and heavy roofs, many of these construction were damaged or collapsed, often killing people.