This report provides details of the February 6 Mw 7.8 and Mw 7.5 earthquakes, describes local seismic codes and building construction practices; compares the
recorded ground shaking with the parameters used for design; summarizes the preliminary reports of damage to buildings and other infrastructure, including the disruption to the community in terms of fatalities, downtime, and economic losses; and highlights key lessons learned, with recommendations to inform
continued study of this event by the engineering community.
