抄録
The lateral distribution of electrons, μ-mesons, and N-components are observed at sea level up to 50 m from the core. The distribution of electrons is consistent with that calculated on the basis of cascade theory. The distribution of μ-mesons is flatter than that of electrons and is represented as r−0.7. The distribution of N-components is similar to that of electrons. The number of μ-mesons is equal to that of N-components at several meters from the core.