The earthquake was followed by a series of violent tremors that damaged many buildings.

violent 是形容词，意思是"猛烈的、剧烈的"，描述程度强烈或具有破坏性的动作或现象。 tremors 是 tremor 的复数形式，tremor 指"震动、颤抖"，在这里特指地震后的"余震"。 violent tremors 指"剧烈的余震"，强调余震的破坏性强。