【摘要】 详细的分析了震中矩对持时的影响,其中持时是以70%能量持时为研究对象.利用美国强震记录,在Ⅱ类场地上,对震级和震中矩进行分组,研究在每一组内的平均能量持时,进而得出持时与震中矩之间的关系.通过研究发现,随着震中矩的增大,持时相应的变长,但是当震级较大时(7级),持时有变短的趋势;同时震中矩对持时的影响在两水平方向上都是非常明显的,总体而言东西向的值要大于南北向的值,表现出较强的方向性.更多还原

【Abstract】 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.更多还原