POSC Specifications Version 3.0 |
Epicentre Standard Values ref_seismic_velocity |
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 |