The Influence of Epicenter Distance to Horizontal Earthquake Ground Motion Duration

The influence of epicenter distance on earthquake ground motion duration is discussed based on American strong ground motion records.In study,70% energy duration delegates duration.It is notable for the influence of epicenter distance on earthquake ground motion duration through analysis.As a whole,the greater the epicenter distance,the longer the duration is.But,the duration turns short while the magnitude is bigger.In the other hand,duration of east-west direction is longer than south-north direction,so the duration changes as the direction changes.