地震の最大振幅が距離に対して減衰する割合-それと地下構造との関係

抄録

C. Tsuboi has found that the following formula is useful for calculating the Gutenberg-Richter's magnitude of an earthquake occurring in and near Japan from seismological data;
M=αlogΔ+logA+γ
α can be regarded as the decay factor for each station of maximum amplitude of earthquake waves according to distance.
The present writer determined the constants α and γ for each seismological station which make seismological data at it fit the corresponding Gutenberg-Richter's magnitude as closely as possible.
The result is shown in Table I and Fig. 1. The value of α differs for different stations, and its distribution appears to have close relation to that of Bouguer Anomalies.