USGS scientists monitored Parkfield for a wide variety of possible precursory effects, but the predicted earthquake did not materialize until 2004, long after the prediction window expired.

• 美国地质调查局的科学家对帕克菲尔德可能存在的诸多前兆效应进行监测，但直到2004年，预测窗口已经失效很久以后，地震才发生。