[SAC-HELP] flat-earth angles, distances, and src/rec locations

[Philip Crotwell]

The easiest way might be to put the station and the event on the
equator, then az and baz are 180 off each other and the ellipticity
doesn't impact the distance.

Philip

On Fri, Jul 8, 2011 at 5:24 PM, Carl Tape <carltape at gi.alaska.edu> wrote:
> Dear sac-help:
>
> I am wanting to compare synthetic seismograms computed using a
> flat-earth model using two different techniques. It seems like it
> would be easiest to "turn off" the sphericity/ellipticity of the
> Earth, and then input the source and station locations in, say, km.
> And then the azimuth and back-azimuth angles would differ by exactly
> 180 degrees. I do not see a sac header that might do this -- is there
> a simple solution? Alternatively, it seems I could set LCALDA = false,
> and then manually enter at least some information, but it would be
> safer to have sac to the computations based on input source and
> station locations.
>
> Thanks,
> Carl
>
> ---------------------------------------------------------------
> Carl Tape
> Assistant Professor
> Geophysical Institute
> University of Alaska Fairbanks
> Phone: 907-474-5456
> Email: carltape at gi.alaska.edu
> Web: http://www.giseis.alaska.edu/input/carl/
> ---------------------------------------------------------------
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