佳木斯地震台DSQ水管倾斜仪对日本及日本海域地震的前兆反映

The precursor response of DSQ water pipe clinometer at Jiamusi Seismic Station to the earthquakes in Japan and Japan Sea area

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,常有大量介质破裂及裂隙间的粘滑产生,反映到地倾斜记录仪上,表现为固体潮形变异常。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。佳木斯地震台可能处于这种特殊的构造部位,其前兆异常对1000km以外的日本及日本海域的地震有明显短临前兆反映。

It is found that before the main rupture of a violent earthquake, crustal deformation occurs. During the peak stage of the deformation under high stress environment, mass medium fracture and sticky slip will appear in cracks, and they are represented as solid tides anomalies in the records of clinometer. Resent years, some researchers have found that longdistance precursors sometimes occurred at the especial places where is sensitive to the variations of stress and strain. Jiamusi Seismic Station may be located in such place where shows evident precursor anomalies reflected the earthquakes of 1 000 km away in Japan and Japan sea area.