 The discrepancy was resulted from that the earthquake had a long source duration of about 130 s, and by calculating the seismic moment, the magnitude would be Mw 7.6 or Mw 7.8, according to different sources.This earthquake belongs to a category of earthquakes with slow rupture velocities and potential of producing tsunamis larger than those expected from the moment magnitudes.This earthquake triggered a tsunami with a height of in Puerto Eten, Lambayeque Department.