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地倾斜观测受太阳幅射能对地表作用的影响,显示出季节性年变化.我站重锤倾斜仪表现的年变化规律是:每年3月开始向西南方向倾斜,9月开始向北东方向倾斜,年变轨迹近似一个椭园.但这种变化是很缓慢的,在倾斜日照图上几乎看不出它的变化.因此,在正常情况下,日变曲线是一条直线.3年的观测记录表明,如果发生下述两种情况:①日照图改变了日常的直线形态,出现了弯曲变化;②打破了年变规律,在几天中明显的超过年变速率或改变了年变方向.这些现象往往是短临前兆异常.下面举两个震例:1.1979年6月19日山西介休5.1级地震.
Ground tilt observation of the solar radiation on the role of the Earth’s surface, showing a seasonal annual change. My station hammer inclinometer annual variation is: starting in March each year to the southwest tilt, starting in September to the northeast Tilting, orochronous trajectory approximates an ellipse, but the change is slow, and almost no change can be seen in a tilted map, so the diurnal curve is a straight line under normal conditions.3 years of observation Records show that if the following two situations occur: ① sunshine map changed the daily straight line shape, there has been bending changes; ② broke the law of change, in a few days significantly over the annual rate of change or change the direction of the year. These phenomena are often short-term precursory anomalies. Here are two earthquake cases: 1. June 19, 1979 Shanxi Jiexiu 5.1 earthquake.