佳木斯台形变观测对东北地区几次浅震"场兆"异常的探讨

大地震在主破裂前往往行成地壳变形,高应力作用下进入峰值后的变形阶段,反映到地倾斜观测日均值曲线上,表现为固体潮形变趋势异常,这些异常能否指示远距离的地震,近年来不少研究者发现,远场前兆往往出现在对应力、应变变化反应灵敏的特殊构造部位.佳木斯台可能处于这种特殊的构造部位,对东北地区浅源地震短期前兆异常"场兆"的趋势性变化具有一定的意义.

An Analysis of Unusual "Field Precursors" of Some Shallow Earthquakes in Northeast China Based on Deformation Measurement by Jiamusi Seismic Station

Big earthquakes are inclined to cause crust changes before main ruptures,and then go into the post-peak change period due to high stresses.Reflected by the curves of daily mean value of tilt,earth tide deformation tendency is anomalous.Can the anomalies indicate distant earthquakes? Recently,some researchers have found that long field precursors usually appear at the special places which are sensitive to stress-strain changes.Jiamusi must be such a place,the study of which is useful to the anomalous tendency of some shallow-earthquake field precursors in Northeast China.