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早在三十年前,日本人奥田丰三介绍过日本四国、纪伊地区1946至1949年地方性垂线变化,此结果是由天文观测得到的。在短短几年内,垂线变化最大处达3″.3。将此值换算为重力场水平分量的变化,大约是0.0157伽。大地震前重力异常的最大值一般只能达到数百微伽(指重力仪测得的垂直分量)。前者比后者大数百倍,所以,有人怀疑天文观测的结果。这里有必要对此问题做些讨论。
As early as thirty years ago, Japanese Okuda Frasan introduced changes in the local vertical from 1946 to 1949 in the Shikoku and Kii areas of Japan, and the result was obtained from astronomical observation. In just a few years, the maximum vertical line changes up to 3 ".3 This value is converted into a change in the horizontal component of the gravitational field, which is about 0.0157 Gy. The maximum gravity anomaly before a large earthquake can only reach hundreds of microgas (Referring to the vertical component measured by the gravimeter) .The former is hundreds of times larger than the latter, so some people doubt the result of the astronomical observation It is necessary to discuss the issue here.