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

[Carl Tape]

Hi Philip,

Thanks, but that still leads to the issue of having the wrong headers.
I am comparing source radiation at stations with different azimuths,
so the headers need to be correct -- and, ideally, appropriate for a
flat earth.

It doesn't sound like turning of earth sphericity (or ellipticity) is
an option, which is fine. I was just checking.

Thanks,
Carl

On Mon, Jul 11, 2011 at 12:24 PM, Philip Crotwell <crotwell at seis.sc.edu> wrote:
> 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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>