Modal response spectrum analysis predicts the seismic response of structures. During the analysis, experts break down a structure’s vibrational behavior into basic vibration modes characterized by specific mode shapes and frequencies. Upon analyzing the mode shapes, engineers can determine how structures will respond to seismic events. The process begins with modal analysis which later helps technicians determine each mode’s response after learning information about its acceleration, displacement, and velocity. Technicians then combine the modal responses to gauge the structure’s likely response.