京王プラザホテルにおける重力鉛直勾配の測定

抄録

Measurements of vertical gradient of gravity carried out at Keio Plaza Hotel Building which was built recently. This building is in Tokyo (latitude: 35°41.2'E longitude: 139°41.9'N) and its height is about 170 m above the ground. The mean value of the gradient measured was 0.3049 mgal/m ± 0.00032SD. There are four stations where the vertical gradients of gravity have been measured in and around Tokyo. The distribution has a tendency to increase toward north in this area same as the free air anomaly distribution.