Lunar subsurface velocity structure from correlation of ambient noise gathered by Apollo passive seismic experiment

Details Lunar subsurface velocity structure from correlation of ambient noise gathered by Apollo passive seismic experiment Lunar subsurface velocity structure from correlation of ambient noise gathered by Apollo passive seismic experiment

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p33a1746z&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P33A-1746

Physics

Geophysics

[0935] Exploration Geophysics / Seismic Methods, [6250] Planetary Sciences: Solar System Objects / Moon, [7270] Seismology / Tomography, [8147] Tectonophysics / Planetary Interiors

Scientific paper

We have retrieved several interested dispersed Rayleigh wave pulses by correlating ambient noises gathered by four seismometers deployed on the Moon during the Apollo missions. Inversion of the group velocities provides a new image of velocity on the lunar subsurface structure. The passive imaging method is based on the time domain cross-correlation of seismic waves selected from any two of the four Apollo passive seismometers. We computed the cross-correlograms of short-period vertical component of ambient seismic noise in the frequency range from 0.005 to 0.03Hz, from which we extracted clear dispersion curves. The inversion results demonstrate that the surface or shear wave velocity increases obviously with depth in the lunar crust and upper mantel. Compared with the results from lunar seismic body wave given by scholars such as Nakamura and Khan, the shear velocity derived here is about 10% greater. In addition, the results also indicate that there may be two or three substructures in the lunar upper mantel. The shear wave velocities from ambient seismic noise may be considered as new constraints in large scale on the lunar subsurface structure, especially the mantle structure.

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