In case recorded data are not available at that site, then simulation of ground motion is the only way for engineers to rely upon. The seismic design of engineered structures depends upon a quantitative estimate of the characteristics of strong ground motion at desired site. The cut-off frequency “f max” can also be studied and interpreted to confirm about its origin. The obtained spectral parameters have been used to estimate source parameters (e.g., seismic moment, source dimension and stress drop etc.) and to develop scaling laws for the study region. The software EQK_SRC_PARA is written in MATLAB and uses input data in Sesame ASCII Format (SAF) format. A Brune’s source model that yield a fall-off of 2 beyond corner frequency is considered with high cut-off frequency factor presented by Boore that fits well for frequencies greater than f max. Keywords: Spectral Parameters Source Parameters EQ_SRC_PARA Garhwal UttarkashiĪ software (EQK_SRC_PARA) has been developed to estimate spectral parameters of earthquake source spectrum, namely: low frequency displacement spectral level (Ω 0), corner frequency above which spectrum decays with a rate of 2 (f c), the cut-off frequency above which the spectrum again decays (f max) and the rate of decay above f max (N). Department of Earthquake Engineering, Indian Institute of Technology, Roorkee, IndiaĮmail: Septemrevised Octoaccepted November 11, 2012
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