Fig. 3
Acquisition principles and parameters. a Principle of ACP-binning (modified after Behle & Dohr 1985). If a downgoing P-wave from shotpoint SP is converted at a reflector, the conversion point (CP) moves towards the receiver (G), compared to a reflection point of the same wavetype (CMP). Black and blue arrows mark polarizations, i.e., particle motions, x is the offset between SP and G, xp and xs are the distances from SP to CP and from CP to G, respectively. b Distribution of absolute offset of our 3D3C dataset. The offset varies from 0 to 6852 m, with a median value (black line) of 2756 m. c Map of CMP and ACP fold of our 3D3C dataset. In the case of ACP-binning, the fold is higher but covers a smaller area. The cyan line marks the position of the cross section in Fig. 7. The blue star marks the position of the ACP bin shown in Fig. 3d and the green star marks the center of the supergather shown in Fig. 6. d Offset and azimuthal coverage of an example ACP bin. The azimuthal coverage is limited due to the linear receiver deployment