Attribute Description: The Phase Breaks signal marks phase discontinuities by picking peaks from a difference signal that is constructed by subtracting the phase signal from the smoothed phase signal. It extracts a peak at the -180-degree phase point of the real trace and creates a 3 sample spike to designate that location. The result reflects the discontinuities in the phase and is amplitude independent. For greater detail read “Banded Attributes Overview".
Interpretation Use: This attribute may provide value by:
- Providing improved “trough” interpretation
- Showing boundaries of sequences and depositional environments
- Showing discontinuities and faults
- Making normal event interpretation easier as amplitude is removed
Since the distribution of this data is all positive, and amplitudes reside in a 3 trace spike, a wraparound colorbar gives a trace-like view and highlights discontinuities.
Computation: Phase breaks is computed in several steps. First, smooth phase is computed as
where b(t) is a boxcar function with a length of T samples and height 1/T
Phase breaks are computed by convolving a 3-sample Hanning smoother han(t) with the Hilbert transform of the difference between the phase and the smoothed phase.
- Taner, M. T., 2001, Seismic attributes: Canadian Society of Exploration Geophysicists Recorder, 26, no 7.
- Tom Smith, Paradise Instantaneous Attributes, 2017, Paradise Help