# Dictionary:Thin bed indicator

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The thin bed indicator is a seismic attribute that shows the interference zones in phase, and relates to closely spaced events. This is determined by the locations where instantaneous frequencies jump or go in the reverse direction, indicating closely arriving reflected wavelets. Therefore, the time derivative of the phase function will contain the indicators for thin beds. Its smooth variations will relate to the bedding characteristics and is computed as the difference between the instantaneous frequency, ${\displaystyle \omega (t)}$, and time averaged frequency, ${\displaystyle {\overline {\omega }}(t)}$. [1]

${\displaystyle thin.bed(t)=\omega (t)-{\overline {\omega }}(t)}$

Thin bed indicator shows the interference zones in phase. It is a physical attribute since it relates to closely spaced events. It can be used in detailed studies:

• Computed from large spikes of instantaneous frequency, indicates overlapped events.
• Indicates thin beds, when laterally continuous.
• Indicates non-reflecting zone, when it appears laterally at random, like 'salt and pepper'.
• Shows fine detail of bedding patterns.

## References

1. Taner, Turhan (1992), Attributes Revisited, Rock Solid Images Houston, Texas (published 2000)