Article (Scientific journals)
2D dynamic studies combined with the surface curvature analysis to predict Arias Intensity amplification
Torgoev, Almazbek; Havenith, Hans-Balder
2016In Journal of Seismology
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Keywords :
Modelling; topographic effects; Newmark
Abstract :
[en] A 2D elasto-dynamic modelling of the pure topographic seismic response is performed for six models with a total length of around 23.0 km. These models are reconstructed from the real topographic settings of the landslide-prone slopes situated in the Mailuu-Suu River Valley, Southern Kyrgyzstan. The main studied parameter is the Arias Intensity (Ia, m/sec), which is applied in the GIS-based Newmark method to regionally map the seismically-induced landslide susceptibility. This method maps the Ia values via empirical attenuation laws and our studies investigate a potential to include topographic input into them. Numerical studies analyse several signals with varying shape and changing central frequency values. All tests demonstrate that the spectral amplification patterns directly affect the amplification of the Ia values. These results let to link the 2D distribution of the topographically amplified Ia values with the parameter called as smoothed curvature. The amplification values for the low-frequency signals are better correlated with the curvature smoothed over larger spatial extent, while those values for the high-frequency signals are more linked to the curvature with smaller smoothing extent. The best predictions are provided by the curvature smoothed over the extent calculated according to Geli’s law. The sample equations predicting the Ia amplification based on the smoothed curvature are presented for the sinusoid-shape input signals. These laws cannot be directly implemented in the regional Newmark method, as 3D amplification of the Ia values addresses more problem complexities which are not studied here. Nevertheless, our 2D results prepare the theoretical framework which can potentially be applied to the 3D domain and, therefore, represent a robust basis for these future research targets.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Torgoev, Almazbek ;  Université de Liège - ULiège > Doct. sc. (géologie - Bologne)
Havenith, Hans-Balder  ;  Université de Liège > Département de géologie > Géologie de l'environnement
Language :
English
Title :
2D dynamic studies combined with the surface curvature analysis to predict Arias Intensity amplification
Publication date :
January 2016
Journal title :
Journal of Seismology
ISSN :
1383-4649
eISSN :
1573-157X
Publisher :
Kluwer Academic Publishers, Dordrecht, Netherlands
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 31 January 2016

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