Directivity of slope dynamic response to seismic shaking

A four year‐long accelerometric monitoring of a landslide‐prone slope area in Italy provided evidence of amplifications with systematic directional differences in shaking energy by a factor of 2–3, apparently correlated with the directions of local topographic features. The examination of regional‐s...

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Bibliographic Details
Published inGeophysical research letters Vol. 34; no. 12; pp. L12301 - n/a
Main Authors Del Gaudio, Vincenzo, Wasowski, Janusz
Format Journal Article
LanguageEnglish
Published American Geophysical Union 01.06.2007
Blackwell Publishing Ltd
Subjects
directional resonance
Earthquake ground motions and engineering seismology
Mathematical Geophysics
seismic site response
Seismology
slope
Spectral analysis
Wave propagation
seismic site response
slope
directional resonance
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Summary:A four year‐long accelerometric monitoring of a landslide‐prone slope area in Italy provided evidence of amplifications with systematic directional differences in shaking energy by a factor of 2–3, apparently correlated with the directions of local topographic features. The examination of regional‐scale data revealed similar site response directivity phenomena also on some steep rock slopes not affected by amplification. The spectral properties of the site responses were investigated using HVSR analysis and a new approach based on the multiplication of spectra from several events. The results suggest that such phenomena are caused by a directional redistribution of spectral energy controlled by a combination of interrelated topographic and geologic factors acting in similar directions.
Bibliography:istex:D71C35986E953E26063B82647EFA67F8A586870F
ark:/67375/WNG-BRBZHGKZ-G
ArticleID:2007GL029842
Tab-delimited Table 1.
ISSN:0094-8276
1944-8007
DOI:10.1029/2007GL029842