Identification of Seismic Waves for a Nonstationary Load Model from Strong Motion Recordsby R. J. Scherer, Univ of Karlsruhe, Germany,
Abstract: Strong motion records of 5 moderate to strong earthquakes with different source mechanisms are investigated by Evolutionary Spectra Analysis. Only earthquakes with strong motion stations located in the epicentral area were selected. The analysis reveals that the seismic acceleration process consists of three relevant subprocesses representing the direct P- and S-waves and the surface wave field. The importance of the three processes depends on source and on site characteristics. In the horizontal components always the S-wave process is present and often the dominant one. This lead to the incorrect assumption that only the S-wave process is relevant for the seismic load.
Subject Headings: Seismic loads | Surface waves | Seismic tests | Seismic waves | Ground motion | Earthquakes | Graphic methods | Structural models
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