ON THE RECONSTRUCTION OF THE TRANSFER-FUNCTION FOR ATMOSPHERICALLY GENERATED SEICHES

A method recently proposed to separate source and topographic effects in observed tsunami spectra is revised and applied to atmospherically generated seiches. The method is used to investigate the origin of abn ormal seiche events ('rissaga waves') recorded in the region of Ciutad ella, Balearic Islands. The reconstructed open-sea source spectra and the observed atmospheric pressure spectra are combined to estimate the 'transfer function' between the atmosphere and the sea surface. This function is used. to predict sea level spectra for given locations nea r to the coast. Theoretically computed spectra for two 'rissaga' event s are in good agreement with observations.