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蒂海火山岩位于新西兰北岛中部,是年轻的、大部未遭侵蚀的层状安山岩。它的东翼被长6.1公里的吐克尼(ToKaanu)坑道穿过。坑道距地面垂直距离可至370米,平均高度约为200米。为了估计火山岩的体积密度,在坑道中以点距350米进行了21个重力测量,坑道上方地面进行了12个重力测量,测点高度由测量高度内插,可达0.5米,给定的自由空气误差为0.15毫伽;重力测量的误差不超过0.3毫伽,因此,自由空气重力的计算值的总误差不大
Titian volcanic rock is located in the central New Zealand North Island, is a young, most of the unetched layered andesite. Its eastern wing is pierced by the ToKaanu tunnel 6.1 km long. The vertical distance of the tunnel to the ground is up to 370 meters with an average height of about 200 meters. In order to estimate the bulk density of the volcanic rocks, 21 gravimetric measurements were carried out in the tunnel at a pitch of 350 meters with 12 gravimetric measurements on the ground above the tunnel. The height of the measuring point was interpolated by the measuring height to 0.5 m. The air error is 0.15 milli-gal; the error of gravity measurement does not exceed 0.3 milli-gal, so the total error in the calculated value of free-air gravity is not large