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A comparison of two types of velocity models for the lunar crust: smooth continuous and stepwise layered
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Gangi, A. F. |
| Copyright Year | 1978 |
| Description | The data from the Apollo-14 and Apollo-16 Active Seismic Experiments were reanalyzed and show that a power-law velocity variation with depth is consistent with both the traveltimes and amplitudes of the first arrivals for source-to-geophone separations up to 32m. The data were improved by removing spurious glithches, flickering and stacking. While this improved the signal-to-noise ratios, it was not possible to measure the arrivals beyond 32m. The physical evidence that the shallow lunar regolith is made up of fine particles adds weight to the 1/6-power velocity model. The 1/6-power law predicts the traveltime t(x), varies with separation, x, as t(x) = t sub 0 (x/x sub 0) to the 5/6 power and, using a first-order theory, the amplitude, A(x), varies as A(x) = A sub 0 (x/x sub 0) to the (13-m)/12, M 1; the layer-velocity model predicts t(x) = t sub 0 (x/xsub 0) and A(x) = A sub 0 (x/x sub 0) to the 2nd power. |
| File Size | 2499251 |
| Page Count | 59 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19790004816 |
| Archival Resource Key | ark:/13960/t9c58dh23 |
| Language | English |
| Publisher Date | 1978-11-01 |
| Access Restriction | Open |
| Subject Keyword | Lunar And Planetary Exploration Lunar Geology Data Processing Lunar Seismographs Mathematical Models Seismic Waves Velocity Measurement Apollo 14 Flight Apollo 16 Flight Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
