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本文处理了1981年11月邢台5.8级、1980年8月林县4.7级,1983年11月荷泽5.9级、1984年5月黄海6.3级四个中等强度地震前后的序列资料,讨论了红山、林县、嘉祥、南通地震台所记录到的各次地震前后,小震尾波两水平分量持续时间对数lgτ与两水平分量S波最大振幅SH的关系及尾波振动持续时间比τ_H/τ_z随时间的变化。结果表明,邢台、林县、荷泽地震前后它们的变化形态基本一致,即震前低值、震后高值,然后逐渐恢复正常;黄海与前三个地震的变化形态不同,即震前出现高值现象。本文对它们的变化特征进行了初步讨论。
This paper deals with the sequence data of 5.8 in Xingtai in November 1981, 4.7 in Linxian in August 1980, 5.9 in Heze in November 1983, and 6.3 in the middle of the Yellow Sea in May 1984, , Linxian, Jiaxiang and Nantong Seismic stations, the relationship between the logarithm of the two horizontal component durations of small coda wave lgτ and the maximum amplitude SH of two horizontal components and the duration of coda vibration τ_H / τ_z Change over time. The results show that before and after the Xingtai, Linxian and Heze earthquakes, their changing patterns are basically the same, that is, they were low before the earthquake and high after the earthquake, and then gradually returned to normal. The Huanghai Sea and the first three earthquakes changed in different forms, High value phenomenon. This article has carried on preliminary discussion to their change characteristic.