Can somebody suggest a matlab routine or code to obtain a response spectra for different azimuth by rotating horizontal components of motion?

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Adebayo Akanbi Oladapo

Sorry, I have no idea; this is not in my area of expertise

Alessandro Vuan

Ciao Francesco,

I suppose you would like to rotate accelerograms and then calculate fault parallel and fault normal response spectra. I suggest, before rotating horizontal components, to follow the processing described in Boore and Bommer http://daveboore.com/pubs_online/record_processing_sdee_final.pdf

The rotation of two horizontal components after a coorect processing is quite simple. Here you find a tutorial by Charles Ammon with some matlab code you can easily re-program in C or Fortran. http://eqseis.geosc.psu.edu/~cammon/HTML/UsingMATLAB/PDF/ML1%20Rotation.pdf

Francesco Panzera

Thank you very much for the answers and useful suggestions.