【摘要】 使用渤海沿岸8个验潮站的海潮潮位观测资料,根据近海或沿岸地区强震前后海平面变化的实例,分析了海平面变化的前兆意义。资料证实,大部分近海大地震前局部海域存在着可以识别的海平面异常变化。通过周期分析方法和潮汐分析方法来消除各种周期及非周期因素的影响,可以显示出地壳垂直形变的变化,分析结果表明,渤海沿岸的海平面变化不仅具有丰富的地质构造活动信息,而且可能反映较大地震前后的地壳形变过程。提取海平面地壳垂直形变信息对较大地震的预报和与海洋有关灾害的预测有重要意义。更多还原

【Abstract】 In this paper,we use the sea tide level observational data from eight tide-gauge stations in Bohai Sea coast to analyze the precursor meanings of the sea level variation according to the instances about the sea level variation before and after the strong earthquake in the offing or coastal areas.The data show that there are the distinguishable abnormal variations of the sea level in the local sea area before most of inshore strong earthquakes.The variation of the crust vertical deformation is indicated after eliminating various influence of periodic and aperiodic factors by using the periodic method and tide method.The result shows that the sea level variation in the Bohai Sea coast not only contains abundant information of geological structure activity,but also may reflect the crustal deformation process before and after strong earthquake.It is of the important signification to pick-up the information of the crustal vertical deformation for predicting strong earthquake and forecasting oceanic disaster.更多还原