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Site characterizations for the Iranian strong motion network
Authors:M Zare  P -Y Bard  M Ghafory-Ashtiany
Institution:a International Institute of Earthquake Engineering and Seismology, P.O. Box: 19395-3913, Tehran, Iran;b LGIT-IRIGM, Observatoire de Grenoble, Université Joseph Fourier, BP. 53X, 38041 Grenoble Cedex, France;c Laboratoire Central des Ponts-et-Chaussées, 58, Bd Lefèbvre, 75732 Paris Cedex 15, France
Abstract:Twenty-six sites of the Iranian strong motion network, having provided numerous records of good quality, were selected for a site effect study with the objective of obtaining a reliable site categorization for later statistical work on Iranian strong motion data. For each site, superficial Vp and Vs profiles were measured with refraction techniques, microtremor recordings were obtained and analysed with the H/V technique and the available three-component accelerograms by the receiver function technique. The aggregation of these results allows the proposition of a four-class categorization based on the H/V spectral ratio of strong ground motions, which demonstrate a satisfactory correlation with the S-wave velocity profile. Iran has a particular geological and meteorological situation compared to other seismic countries such as Japan or California, a mountainous country with dry weather conditions and a low water table in most areas. These conditions result in a relatively small number of sites with low frequency amplification, while many sites exhibit moderate amplifications in the intermediate and high frequency range.
Keywords:Iran  Site effects  H/V method  Strong motions  Seismic hazard  Site response
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