POSC Specifications
Version 3.0
Epicentre Standard Values
ref_seismic_velocity

ref_seismic_velocity

Standard Instance Values

identifier description source version status
      ref _version .identifier  
arithmetic mean The sum of the velocities divided by the number of velocities in the sum. POSC epicentre 2.1 current
interval The velocity in an interval of material whose value is such that the actual one-way travel time through the interval is equal to the interval distance divided by this velocity. POSC epicentre 2.1 current
instantaneous The seismic velocity property of a material at a particular point in a material. POSC epicentre 2.1 current
root-mean-square The square root of the average (mean) of the interval velicities squared times the interval travel times. It is equivalent to the weighted average of the interval velocities where the weighting is on the interval travel distances. POSC epicentre 2.1 current
seismic normal moveout The velocity that best fits the normal moveout equation of the measured two-way travel times vs. offset. POSC epicentre 2.1 current
seismic stacking The velocity that gives a maximum coherence or maximum amplitude of stacked trace when the velocity is used to perform normal moveout. POSC epicentre 2.1 current
migration The velocity that gives a maximum coherence or maximum amplitude of a migrated and stacked trace when the velocity is used to perform a migration. POSC epicentre 2.1 current
migration corrected The stacking velocity that has been corrected for the dip of the event. POSC epicentre 2.1 current
waveform phase The velocity of a particular wavefront. The velocity of travel of a particular phase of a wave. POSC epicentre 2.1 current
waveform group The velocity of a packet of energy of seismic energy. If the group velocity does not equal the phase velocity, different frequencies travel at different phase velocities and dispersion occurs. POSC epicentre 2.1 current

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