ripartite plots smooth response spectrum
 

tripartite plots & smooth response spectrum
i'm trying to find a software that i can use to plot four-way logarithmic graphs (response spectrum). right now i'm doing this by hand. in addition i'm trying to find a software to construct smoothed response spectra out of attenuation relationships
this will be used to construct plots for various site-to-source distances values an so on. if someone can provide me any assistance on this matter i will be very gratefull
regards,
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i have eqpack by case computer aided structural engineering inc that produces response spectrum charts (dos). this is cheap item. they say it is part of a big package of related seismic applications to structural engineering so i bet if this is not exactly what you need they may have something that does. make a search for case.
the risa-3d demo program has spectra entry and tripartite plotting built in. you can download the demo for free from