[SAC-HELP] units of EVDP in SAC

[George Helffrich]

MacSAC has a functioning version of the TRAVELTIME command.

If the depth's numerical value is greater than 1000, it assumes the value is in meters.  This is a useful heuristic for the Earth's earthquakes, but not perhaps for other terrestrial planets, e.g. the moon.  (On the other hand, SAC's distance calculations, ellipticity corrections for distance and azimuth would be unsuitable for other planets.)

My own view is that the heuristic works well enough that there isn't any need to change SAC's formal unit definition, though kilometers it is what earthquake seismologists expect.

          George Helffrich
          george.helffrich at bris.ac.uk