Abstract: As strong seismic zone, three earthquakes with M_S 7 occurred along Kumafault zone since 1900, and before two strong shocks M_S ≥ 5 earthquakes formed the background gap. It shows that background gas is of significance in the prediction of strong shock along this zone. A background gas and a seism ogenic gap have formed in the same place, and their evolutionary patterns accord with the strong seism ogenic model. The seismogenic gap along Kumafault zone shows the precursory significance for the Gonghe earthquake with M= 7 and its strong after shocks. It may be a stress window of strong shock breed.

Key words: Kumafault zone, Seismicity gap, Earthquake prediction