Mare subsurface stratification at five locations, as inferred from LRS data. Apparent depth was determined by the mean of a number of A-scope data (10). The electric properties were estimated by inversely solving a Fresnel model with the assumption that the top-layer material has a dielectric constant of 4. The loss tangent, tan δ, of the lowermost layer was not determined, as the attenuation in that layer is unknown. d and D are the apparent depth and estimated depth to the upper surface of each layer, respectively; P is echo power.
| Procellarum (44.5°N, 69.3°W) | Imbrium (36.0°N, 15.3°W) | Crisium (57.0°N, 15.5°E) | Serenitatis (22.0°N, 23.3°E) | Smythii (1.0°N, 87.4°E) | ||
|---|---|---|---|---|---|---|
| Data samples | 400 | 460 | 330 | 530 | 410 | |
| Top layer | tan δ | 0.001 to 0.019 | 0.001 to 0.016 | 0.002 to 0.005 | 0.001 to 0.019 | 0.001 to 0.019 |
| Second layer | d (m) | 320 | 500 | 290 | 350 | 500 |
| D (m) | 160 | 250 | 145 | 175 | 250 | |
| P (dB) | -12.2 | -12.7 | -12.7 | -11.4 | -12.5 | |
| ϵ | 5.86 to 8.08 | 5.77 to 9.04 | 6.45 to 6.76 | 6.09 to 8.09 | 5.82 to 10.68 | |
| tan δ | 0.001 to 0.010 | 0.001 to 0.008 | 0.002 | |||
| Third layer | d (m) | 770 | 1000 | 660 | ||
| D (m) | 343 to 347 | 454 to 460 | 290 to 293 | |||
| P (dB) | -16.0 | -15.6 | -13.0 | |||
| ϵ | 7.64 to 11.03 | 7.52 to 11.89 | 9.25 to 9.71 |