宁波台地倾斜在皎口地震活动中的前兆反应特征

PRECURSORY RESPONSE OF TILTOMETER OF NINGBO SEISMOLOGICAL STATION ON JIAO KOU EARTHQUAKES

通过对宁波台地倾斜近几年来观测资料的分析，发现其在皎口几组地震事件前有不同程度的异常反应。在分量图上，震前出现了短临期前兆异常反应特征，并且有异常时间越长，幅度越大，地震震级就越高的特点。

It is found analytically that tiltometer records of Ningbo seismological station had anomaly responses to some extent prior to several sets of Jiaokou earthquakes since several years.There were precursory anomalies of short period in component figure.The greater of amplitude,their response characteristics are the larger of magnitude, the longer of anomaly time.Besides, anomaly cause is also discussed.