Structure of the moon

Details Structure of the moon Structure of the moon

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974rvgsp..12..539t&link_type=abstract

Reviews of Geophysics and Space Physics, vol. 12, Nov. 1974, p. 539-567.

Physics

Space Physics

36

Lunar Crust, Lunar Seismographs, Moonquakes, Propagation Velocity, Seismic Waves, Seismology, Apollo Flights, Hypervelocity Impact, Lunar Surface, Planetary Structure, Ray Tracing, Wave Scattering

Scientific paper

Seismic data fron the four stations of the Apollo passive seismic network have been analyzed to obtain the velocity structure of the moon. Analysis of body wave phases from artificial impacts of known impact time and position yields a crustal section. In the Mare Cognitum region the crust is about 60 km thick and is layered. In the 20-km-thick upper layer, velocity gradients are high and microcracks may play an important role. The 40-km-thick lower layer has a nearly constant 6.8-km/sec velocity. There may be a thin high-velocity layer present beneath the crust. The determination of seismic velocities in the lunar mantle is attempted by using natural impacts and deep moonquakes. The simplest model that can be proposed for the mantle consists of a 'lithosphere' overlying an 'asthenosphere'.

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