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1984年5月21日江苏南黄海(λ_E=121°.07,φN=32°.07)发生一次6.2级地震。震中300公里范围内四个沿海(距海岸100公里内)深山洞(常熟、佘山、宁波、连云港)台站的水平摆倾斜仪记录到震前潮汐曲线阶变、扰动、畸变或单向脉冲等临震现象(量级仅为10~(-8)～10~(-7))。此外,震中距450公里范围内的多数台站普遍清晰确切地记录到了震时阶跃(10~(-8)～10~(-7))图象。依据南黄海6.2级地震的有价值的原始记录,似乎沿海台站的有一定规律的同震倾斜阶跃与震源参数有关,而不是倾斜仪的随机响应。 最后,笔者提议:在沿海重点监视的一定地区建立一适当密度的潮汐一倾斜观测台网,开展沿海人口稠密地区的地震预报研究,这是非常必要而又大有希望的。
On May 21, 1984, a 6.2 magnitude earthquake occurred in southern Jiangsu Yellow Sea (λ_E = 121 ° .07, φN = 32 ° .07). Horizontal tilt inclinometers at four stations along the coast (within a distance of 100 km from the coast) within 300 km of the epicenter (Changshu, Sheshan, Ningbo and Lianyungang) recorded tidal gradients, disturbances, distortions or unidirectional impulses before the earthquake Pro-seismic phenomena (magnitude only 10 ~ (-8) ~ 10 ~ (-7)). In addition, most of the stations within a distance of 450 km from the epicentral center recorded clear and accurate images of the step-by-step (10 -8 - 10 -7). Based on the valuable original records of the M6.2 Mudanjiang earthquake, it seems that the regular coseismic tilting step at the coastal stations is related to the source parameters rather than the random response of the inclinometer. Finally, the author proposes that it is very necessary and promising to establish an appropriate density tide-tilt observation network in some areas under key coastal surveillance and carry out the earthquake prediction research in the densely populated coastal areas.