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O.J. Ktenidou, N. Abrahamson, S. Drouet, F. Cotton
O.J. Ktenidou, N. Abrahamson, S. Drouet, F. Cotton


this study we estimate the spectral decay factor κ0 for the EUROSEISTEST array. Site conditions range from soft sediments to hard rock over 14 surface and 6 downhole accelerographs. First, we separate local and regional high frequency attenuation and measure κ0. Second, we use the existing knowledge of the geological profile and material properties to correlate κ0 with different site characterisation parameters (Vs30, resonant frequency, depth-to-bedrock). Third, we use our results to improve our physical understanding of κ0. We propose a conceptual model comprising two new notions. On the one hand, we observe that κ0 stabilises for high Vs values; this may indicate the existence of regional values for hard rock κ0. If so, we propose that borehole measurements may be useful in determining them. On the other hand, we find that material damping may not suffice to account for the total measured attenuation. We propose that, apart from damping, additional site attenuation may be caused by scattering from small-scale profile variability. If this is so, then geotechnical damping measurements may not suffice to infer overall crustal attenuation under a site; but starting with a regional (borehole) value and adding damping, we might define a lower bound for site-specific κ0.


high frequencies; attenuation; downhole array; strong ground motion

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Anderson, J.G. and Hough, S.E., 1984. A model for the shape of the fourier amplitude spectrum of

acceleration at high frequencies, Bull. Seism. Soc. Am., 74, 1969-1993.

Edwards, B., Ktenidou, O.-J., Cotton, F., Fäh, D., Van Houtte, C. and Abrahamson, N.A., 2015.

Near-surface attenuation (Kappa0) determination at hard rock sites in Switzerland, Geoph. J.

Int., in press, doi: 10.1093/gji/ggv222.

Ktenidou, O.-J., Gelis, C. and Bonilla, F., 2013. A study on the variability of kappa in a borehole.

Implications on the computation method used, Bull. Seismol. Soc. Am., 103, 1048-1068.

Ktenidou, O.-J., Cotton, F., Abrahamson, N. and Anderson, J.G., 2014. Taxonomy of κ (kappa): a review

of definitions and estimation methods targeted to applications, Seismol. Res. Letts, 85(1), 135-146.

Manakou, M., 2007. Contribution to the determination of a 3D soil model for site response analysis.

The case of the Mygdonian basin. PhD Thesis (in Greek with English abstract), Dept. of Civil

Engineering, Aristotle University of Thessaloniki. Available in pdf format at:


Manakou, M.V., Raptakis, D.G., Chavez-Garcıa, F.J., Apostolidis, P.I. and Pitilakis, K.D., 2010. 3D soil

structure of the Mygdonian basin for site response analysis, Soil Dyn. Earthq. Eng., 30, 1198-1211.

O' Doherty, R.F. and Anstey, N.A., 1971. Reflections on amplitudes, Geophys. Prospecting, 19, 430-458.

Pitilakis, K., Raptakis, D., Lontzetidis, K., Tika-Vassilikou, Th. and Jongmans, D., 1999.

Geotechnical and Geophysical description of EURO-SEISTEST, using field, laboratory tests

and moderate strong-motion recordings, J. Earthq. Eng., 3, 381-409.

Pitilakis, K., Roumelioti, Z., Raptakis, D., Manakou, M., Liakakis, K., Anastasiadis, A. and Pitilakis, D., 2013.

The EUROSEISTEST Strong‐Motion Database and Web Portal, Seismol. Res. Letts, 84, 796-804.

Raptakis, D., Theodulidis, N. and Pitilakis, K., 1998. Data analysis of the EUROSEISTEST strong

motion array in Volvi (Greece): standard and horizontal to vertical spectral ratio techniques,

Earthquake Spectra, 14, 203-224.

Silva, W., Darragh, R., Gregor, N., Martin, G., Abrahamson, N. and Kircher, C., 1998. Reassessment of

site coefficients and near-fault factors for building code provisions, Technical Report Program

Element II: 98-HQGR-1010, Pacific Engineering and Analysis, El Cerrito, USA.


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