蒙城台磁变仪跳动及其原因的初探

A preliminary study of the reason for jumps on the magnetic variometer's records at Mengcheng Seismic Station

2001-03-09蒙城地震台地磁磁变仪CB-3(观测仪，备份仪)同时出现三个分量动线的跳动，分析表明蒙城地震台地磁总强度F、 垂直强度Z发生变化。 其原因可能是强电流作用下，地下介质电性变化所致。

Jumps appeared on the recording traces of all the three components of the CB-3 type geomagnetic variometers(the observational instrument and standby i nstrument) on march 9，2001. An analysis indicated that variation appeared in the geomagnetic total intensity F and the vertical intensity Z. The variations might be caused by the variations in the electric property of the underground medium due to the action of a strong electric current.