# Dictionary:Diodic

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{{#category_index:D|diodic}}
(dī’ ∂d ik)

1. Behaving differently in different directions, i.e., like a diode.

2. **Diodic velocities**^{[1]} occur for C-waves if and/or vary laterally. Hence, the traveltimes of common-conversion point C-waves change if shot in opposite directions (unless also changing P-source to S, and S-receiver to P). Such C-waves obey the Vector Reciprocity Theorem, not the Scalar Reciprocity Theorem, as with pure P-modes.

## Reference

- ↑ Thomsen, L., 1999. Converted-Wave Reflection Seismology over inhomogeneous, anisotropic media, GEOPHYSICS, 64(3), 678-690.