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本文陈述了兰州GS_(11-150)重力仪1983年固体潮观测结果,亦将其与中比合作的两台GS_(15-218)和G_(e0-765)重力仪固体潮观测结果进行对比。它们的结果相近,潮汐因子δ之间仅有0.2％的观测误差。 甘肃旦马1984年元月6日M_S5.5级地震前3个月,GS_(11-150)重力固体潮δ值开始下降,最大下降到6％左右;而从1983年11月起又开始恢复。1984年元月6日发生旦马地震,元月底潮汐因子δ值完全恢复正常。从其重力漂移值曲线看,发现1983年12月17日重力漂移值突然增高,一天之内上升约80微伽,然后一直沿续至今。这些绝非仪器故障所致,而是典型的震兆异常信息。
This paper presents the observation results of solid tide in 1983 from GS_ (11-150) gravimeter in Lanzhou, and compares the observations of two tide GS_ (15-218) and G_ (e0-765) . Their results are similar with a mere 0.2% observation error between tidal factors δ. In the first 3 months before the M_S 5.5 earthquake on January 6, 1984, Danshan, Gansu, the δ-value of the GS 11-150 gravity solid tide began to decline and dropped to about 6% at the maximum. Since November 1983, it started to resume . The Danma earthquake occurred on January 6, 1984 and the tidal factor δ value completely returned to normal at the end of January. From its gravity drift curve, it was found that on 17 December 1983, the gravitational drift suddenly increased, rising by about 80 microgas within one day and continuing until now. These are by no means instrument failures, but rather typical earthquake anomalies.