What is the term for the maximum ground acceleration experienced by rock or soil during an earthquake motion?

The term for the maximum ground acceleration experienced by rock or soil during an earthquake is referred to as Peak Ground Acceleration (PGA). This is a critical measure in seismology, as it quantifies the intensity of ground shaking at a specific location and is essential for designing structures to withstand seismic forces. PGA is expressed in units of g (gravitational acceleration) and helps engineers and geologists understand the potential impact of earthquakes on buildings, infrastructure, and the surrounding environment.

Given its importance in earthquake engineering, PGA is widely used in seismic hazard assessments, building codes, and structural design, making it fundamental knowledge for professionals in the field of geology and earthquake engineering.