泰安重力观测高频波动信号分析

Analysis on the High-frequency Fluctuation Signals in Tai'an Gravity Observation

系统分析了泰安重力观测资料正常和异常时信号的周期特征,研究了高频异常信号与台风、气压和强震之间的关系。结果表明：泰安重力观测正常时信号周期为2~4分钟,异常时信号周期只有2-3分钟,异常信号幅值约为正常信号的5倍;高频异常信号主要是由西太平洋洋面上生成的进入中国大陆或近海的台风引起的,占台风引起泰安重力出现高频异常信号的90%;重力高频信号与台风中心速度正相关,与台风距离负相关,并且随台风的结束高频信号也随之消失;少数高频异常信号与强震也有一定关系,占地震总数的17.24%;高频异常信号与气压变化无关。

The periodic characteristics of normal and abnormal signals in gravity observation data from Tai an station are analyzed systematically.The relationship among the high-frequency abnormal signals and typhoon,strong earthquake and atmospheric pressure is studied.The results show that the signal period are about 2~4 minutes for normal cases and 2-3 minutes for abnormal cases,the amplitude of signals for abnormal cases are about 5 times than for normal cases.High-frequency abnormal signals are mainly caused by the typhoon which originated on western Pacific Ocean and go to China mainland or near regions, with percentage of 90%, and the signals are positively correlated with the velocity in center of typhoon. The abnormal signals would disappear with typhoon ended. Some abnormal signals are related with trong earthquake, taking number of 17.24% of earthquakes. But the signals have no relation with atmospheric pressure.