The lunar seismic tomography and internal heterogeneity

A seismic tomography is presented to show the internal lateral heterogeneities of moon. The lunar seismic tomography is made from the moonquake arrival-time data acquired by the Apollo program during 1971 to 1977. The seismic records obtained from the four seismic station of Apollo Lunar Surface Experiments Package on the moon. The research target covers the surround of Apollo-12, 14, 15 and 16 landing sites. A preliminary image of three-dimensional P- and S-wave velocity structures of lunar interior have been calculated using hundreds of arrival-times of moonquake events from surface to deep mantle. These results show that some evidences of lateral heterogeneities in the lunar mantle and crust, which implies the existence of complex structure inside the moon.