en Seismic Geotechnique Seismic Geotechnique Technical Note Technical Note <p align="left"><i><font face="TimesNewRomanPS-ItalicMT" size="2"><font face="TimesNewRomanPS-ItalicMT" size="2">Seismic ground motion is profoundly affected by geometrical and mechanical properties of soil deposits overlaying bedrock.</font></font></i></p> <p align="left"><i><font face="TimesNewRomanPS-ItalicMT" size="2"><font face="TimesNewRomanPS-ItalicMT" size="2">Local seismic ground response of saturated soil deposits was studied in literature by applying the effects of soil stress state</font></font></i></p> <p align="left"><i><font face="TimesNewRomanPS-ItalicMT" size="2"><font face="TimesNewRomanPS-ItalicMT" size="2">and index properties on the strain-dependent normalized shear modulus reduction, G/G</font></font><font face="TimesNewRomanPS-ItalicMT" size="1"><font face="TimesNewRomanPS-ItalicMT" size="1">0</font></font><font face="TimesNewRomanPS-ItalicMT" size="2"><font face="TimesNewRomanPS-ItalicMT" size="2">, and damping ratio, D, curves in an</font></font></i></p> <p align="left"><i><font face="TimesNewRomanPS-ItalicMT" size="2"><font face="TimesNewRomanPS-ItalicMT" size="2">equivalent linear analysis. However, experimental investigations revealed that, G</font></font><font face="TimesNewRomanPS-ItalicMT" size="1"><font face="TimesNewRomanPS-ItalicMT" size="1">0</font></font><font face="TimesNewRomanPS-ItalicMT" size="2"><font face="TimesNewRomanPS-ItalicMT" size="2">, G/G</font></font><font face="TimesNewRomanPS-ItalicMT" size="1"><font face="TimesNewRomanPS-ItalicMT" size="1">0</font></font><font face="TimesNewRomanPS-ItalicMT" size="2"><font face="TimesNewRomanPS-ItalicMT" size="2">, and D of unsaturated soils are</font></font></i></p> <p align="left"><i><font face="TimesNewRomanPS-ItalicMT" size="2"><font face="TimesNewRomanPS-ItalicMT" size="2">influenced by stress state as well as suction. This study presents the results of linear and equivalent linear seismic ground response</font></font></i></p> <p align="left"><i><font face="TimesNewRomanPS-ItalicMT" size="2"><font face="TimesNewRomanPS-ItalicMT" size="2">analysis of unsaturated soil deposits incorporating suction effects on G/G</font></font><font face="TimesNewRomanPS-ItalicMT" size="1"><font face="TimesNewRomanPS-ItalicMT" size="1">0 </font></font><font face="TimesNewRomanPS-ItalicMT" size="2"><font face="TimesNewRomanPS-ItalicMT" size="2">and D curves. Seismic ground response analyses were</font></font></i></p> <p align="left"><i><font face="TimesNewRomanPS-ItalicMT" size="2"><font face="TimesNewRomanPS-ItalicMT" size="2">done with the computer program EERA for three sets of soil profiles, which are included in saturated, constant and linearly</font></font></i></p> <p align="left"><i><font face="TimesNewRomanPS-ItalicMT" size="2"><font face="TimesNewRomanPS-ItalicMT" size="2">variable suction unsaturated soil deposits. The results of current study present the magnitude of variation in natural frequency,</font></font></i></p> <p><i><font face="TimesNewRomanPS-ItalicMT" size="2"><font face="TimesNewRomanPS-ItalicMT" size="2">amplification ratio and spectral acceleration of unsaturated soil deposits.</font></font></i></p> Unsaturated soil, Soil dynamics, Equivalent-linear, Seismic ground response analysis, EERA 150 155 http://ijce.iust.ac.ir/browse.php?a_code=A-10-929-1&slc_lang=en&sid=1 M. Biglari mahnooshbiglari@yahoo.com 180031947532846009936 180031947532846009936 Yes Assisstant Professor, Civil Engineering Department, School of Engineering, Razi University, Kermanshah, Iran I. Ashayeri i.ashayeri@razi.ac.ir 180031947532846009937 180031947532846009937 No Assisstant Professor, Civil Engineering Department, School of Engineering, Razi University, Kermanshah, Iran