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Volume 9, issue 4 | Copyright
Geosci. Model Dev., 9, 1567-1596, 2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Model description paper 26 Apr 2016

Model description paper | 26 Apr 2016

SiSeRHMap v1.0: a simulator for mapped seismic response using a hybrid model

Gerardo Grelle1, Laura Bonito2, Alessandro Lampasi3, Paola Revellino2, Luigi Guerriero2, Giuseppe Sappa1, and Francesco Maria Guadagno2 Gerardo Grelle et al.
  • 1Department of Civil and Environmental Engineering, University of Rome “La Sapienza” via Eudossiana 18, 00184, Rome, Italy
  • 2Department of Sciences and Technologies, University of Sannio, via Dei Mulini 59/A, 82100, Benevento, Italy
  • 3ENEA Frascati Research Center, Via Enrico Fermi 45, 00044 Frascati, Rome, Italy

Abstract. The SiSeRHMap (simulator for mapped seismic response using a hybrid model) is a computerized methodology capable of elaborating prediction maps of seismic response in terms of acceleration spectra. It was realized on the basis of a hybrid model which combines different approaches and models in a new and non-conventional way. These approaches and models are organized in a code architecture composed of five interdependent modules. A GIS (geographic information system) cubic model (GCM), which is a layered computational structure based on the concept of lithodynamic units and zones, aims at reproducing a parameterized layered subsoil model. A meta-modelling process confers a hybrid nature to the methodology. In this process, the one-dimensional (1-D) linear equivalent analysis produces acceleration response spectra for a specified number of site profiles using one or more input motions. The shear wave velocity–thickness profiles, defined as trainers, are randomly selected in each zone. Subsequently, a numerical adaptive simulation model (Emul-spectra) is optimized on the above trainer acceleration response spectra by means of a dedicated evolutionary algorithm (EA) and the Levenberg–Marquardt algorithm (LMA) as the final optimizer. In the final step, the GCM maps executor module produces a serial map set of a stratigraphic seismic response at different periods, grid solving the calibrated Emul-spectra model. In addition, the spectra topographic amplification is also computed by means of a 3-D validated numerical prediction model. This model is built to match the results of the numerical simulations related to isolate reliefs using GIS morphometric data. In this way, different sets of seismic response maps are developed on which maps of design acceleration response spectra are also defined by means of an enveloping technique.

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Short summary
SiSeRHMap is a computer methodology for the mapped simulation of site seismic response (SSR) by means of a hybrid model. It combines physically based methods and adaptive and predictive numerical models that are solved in a layering GIS-geometric model. SiSeRHMap develops sets of different multispectral maps of site seismic response and other relating them, taking into account topography effects. Easy to use, SiSeRHMap seems to assure accuracy and robustness in the prediction performances.
SiSeRHMap is a computer methodology for the mapped simulation of site seismic response (SSR) by...