Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 6o MATSUYAMA, FUJITA AND HIGASHINAKA Hence the results obtained by taking the average value of 360 20' and calculating the influence of it was as follows: d2U d2U B - A = =+ dy2 dx2 G = d2u dxdz + 7-8 d2U H = = o dxdy d2u F = = o dydz The results of correcting the observed values by the foregoing are shown in Figure 1. V x Railroad Lake Suwa Kami' Sutva (Pendulum Station) ) Uga Akanurna (Railroad sinking) Distance O 1250 ZSOO m. Hm 1 I I O 100 20O £. h
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 6o MATSUYAMA, FUJITA AND HIGASHINAKA Hence the results obtained by taking the average value of 360 20' and calculating the influence of it was as follows: d2U d2U B - A = =+ dy2 dx2 G = d2u dxdz + 7-8 d2U H = = o dxdy d2u F = = o dydz The results of correcting the observed values by the foregoing are shown in Figure 1. V x Railroad Lake Suwa Kami' Sutva (Pendulum Station) ) Uga Akanurna (Railroad sinking) Distance O 1250 ZSOO m. Hm 1 I I O 100 20O £. h 1 1 1 I —I Gradient and curvature values Fig. 1.—Diagram showing gravity gradients and curvature values at Suwa Basin. (To conform to American practice in plotting, i?-lines should be rotated through 90°.) The determination of gravity by means of a pendulum at Kami- Suwa, conducted by the Bureau of Geodesy of Japan, gave the value of dynes. Therefore, by taking this value as zero, the isogam lines calculated gave the results shown in Figure 2. 720
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