Near-field horizontal and vertical earthquake ground motions

N. N. Ambraseys, J. Douglas

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Strong-motion attenuation relationships are presented for peak ground acceleration, spectral acceleration, energy density, maximum absolute input energy for horizontal and vertical directions and for the ratio of vertical to horizontal of these ground motion parameters. These equations were derived using a worldwide dataset of 186 strong-motion records recorded with 15 km of the surface projection of earthquakes between Ms = 5:8 and 7.8. The effect of local site conditions and focal mechanism is included in some of these equations.

Original languageEnglish
Pages (from-to)1-18
Number of pages18
JournalSoil Dynamics and Earthquake Engineering
Issue number1
Early online date28 Dec 2002
Publication statusPublished - 31 Jan 2003


  • earthquake ground motions
  • peak ground acceleration
  • response spectra
  • vertical to horizontal ratios

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