TY  - JOUR
A1  - Derras, Boumediene
A1  - Bard, Pierre-Yves
A1  - Cotton, Fabrice
T1  - Site-Condition Proxies, Ground Motion Variability, and Data-Driven GMPEs: Insights from the NGA-West2 and RESORCE Data Sets
JF  - Earthquake spectra : the professional journal of the Earthquake Engineering Research Institute
N2  - We compare the ability of various site-condition proxies (SCPs) to reduce the aleatory variability of ground motion prediction equations (GMPEs). Three SCPs (measured V-S30, inferred V-S30, local topographic slope) and two accelerometric databases (RESORCE and NGA-West2) are considered. An artificial neural network (ANN) approach including a random-effect procedure is used to derive GMPEs setting the relationship between peak ground acceleration (PGA), peak ground velocity (PGV), pseudo-spectral acceleration [PSA(T)], and explanatory variables (M-w, R-JB, and V-S30 or Slope). The analysis is performed using both discrete site classes and continuous proxy values. All "non-measured" SCPs exhibit a rather poor performance in reducing aleatory variability, compared to the better performance of measured V-S30. A new, fully data-driven GMPE based on the NGA-West2 is then derived, with an aleatory variability value depending on the quality of the SCP. It proves very consistent with previous GMPEs built on the same data set. Measuring V-S30 allows for benefit from an aleatory variability reduction up to 15%.
Y1  - 2016
U6  - https://doi.org/10.1193/060215EQS082M
SN  - 8755-2930
SN  - 1944-8201
VL  - 32
SP  - 2027
EP  - 2056
PB  - Earthquake Engineering Research Institute
CY  - Oakland
ER  - 
TY  - JOUR
A1  - Garofalo, F.
A1  - Foti, S.
A1  - Hollender, F.
A1  - Bard, Pierre-Yves
A1  - Cornou, C.
A1  - Cox, B. R.
A1  - Ohrnberger, Matthias
A1  - Sicilia, D.
A1  - Asten, M.
A1  - Di Giulio, G.
A1  - Forbriger, T.
A1  - Guillier, B.
A1  - Hayashi, K.
A1  - Martin, A.
A1  - Matsushima, Satoru
A1  - Mercerat, D.
A1  - Poggi, V.
A1  - Yamanaka, H.
T1  - InterPACIFIC project: Comparison of invasive and non-invasive methods for seismic site characterization. Part I: Intra-comparison of surface wave methods
JF  - Soil Dynamics and Earthquake Engineering
N2  - The main scope of the InterPACIFIC (Intercomparison of methods for site parameter and velocity profile characterization) project is to assess the reliability of in-hole and surface-wave methods, used for estimating shear wave velocity. Three test-sites with different subsurface conditions were chosen: a soft soil, a stiff soil and a rock outcrop. This paper reports the surface-wave methods results. Specifically 14 teams of expert users analysed the same experimental surface-wave datasets, consisting of both passive and active data. Each team adopted their own strategy to retrieve the dispersion curve and the shear-wave velocity profile at each site. Despite different approaches, the dispersion curves are quite in agreement with each other. Conversely, the shear-wave velocity profiles show a certain variability that increases in correspondence of major stratigraphic interfaces. This larger variability is mainly due to non-uniqueness of the solution and lateral variability. As expected, the observed variability in V-s,V-30 estimatesis small, as solution non-uniqueness plays a limited role. (C) 2015 Elsevier Ltd. All rights reserved.
KW  - Surface-wave methods
KW  - Dispersion curve
KW  - Inversion
KW  - V-s,V-30
KW  - Site characterization
KW  - MASW
KW  - Microtremors
KW  - Rayleigh waves
KW  - Geophysical methods
Y1  - 2016
U6  - https://doi.org/10.1016/j.soildyn.2015.12.010
SN  - 0267-7261
SN  - 1879-341X
VL  - 82
SP  - 222
EP  - 240
PB  - Elsevier
CY  - Oxford
ER  -