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本文研究短周期地磁变化转换函数的时间变化,以探索可能与唐山地震有关的电导率异常。结果表明,在离余震区5km 和60km 的两个台站,转换函数 A 有明显的负异常。但在余震区以西145km 的另一台站,A 的异常变化不明显。如果存在电导率的异常变化,那么变化最大的深度是与周期为14—20min 对应的深度。在昌黎台,地下导电体界面的倾角可能减小了约2.7°。
In this paper, the temporal variation of short-period geomagnetic change transfer function is studied to explore the conductivity anomalies that may be related to the Tangshan earthquake. The results show that the transfer function A has obvious negative anomalies at two stations of 5km and 60km away from the aftershock zone. However, at another station 145 km west of the aftershock zone, the abnormal change of A is not obvious. If there is an abnormal change in conductivity, then the depth of the most change is the depth corresponding to the period of 14-20 min. In Changli station, the inclination of the underground conductor interface may be reduced by about 2.7 °.