A hybrid model for mapping simplified seismic response via a GIS-metamodel approach

Abstract

Abstract. In earthquake-prone areas, site seismic response due to lithostratigraphic sequence plays a key role in seismic hazard assessment. A hybrid model, consisting of GIS and metamodel (model of model) procedures, was introduced aimed at estimating the 1-D spatial seismic site response in accordance with spatial variability of sediment parameters. Inputs and outputs are provided and processed by means of an appropriate GIS model, named GIS Cubic Model (GCM). This consists of a block-layered parametric structure aimed at resolving a predicted metamodel by means of pixel to pixel vertical computing. The metamodel, opportunely calibrated, is able to emulate the classic shape of the spectral acceleration response in relation to the main physical parameters that characterize the spectrum itself. Therefore, via the GCM structure and the metamodel, the hybrid model provides maps of normalized acceleration response spectra. The hybrid model was applied and tested on the built-up area of the San Giorgio del Sannio village, located in a highrisk seismic zone of southern Italy. Efficiency tests showed a good correspondence between the spectral values resulting from the proposed approach and the 1-D physical computational models. Supported by lithology and geophysical data and corresponding accurate interpretation regarding modelling, the hybrid model can be an efficient tool in assessing urban planning seismic hazard/risk.

New approaches to modelling of local seismic amplification susceptibility using direct characteristics of influencing criteria: case study of Bam City, Iran

“…The potential criteria influencing local seismic amplification susceptibility were determined through a critical review of literature. By reviewing documents on earthquake engineering, seismology, geology, tectonic and structural engineering, geomorphology, and seismic microzonation reports and guidelines (Fäh et al, 1997;Ding et al, 2004;Molina et al, 2010;Mundepi et al, 2010;Marulanda et al, 2012;Hassanzadeh et al, 2013;FEMA, 2014;Fraume et al, 2014;Grelle et al, 2014Grelle et al, , 2016SM Working Group, 2015;Rehman et al, 2016;Nwe and Tun, 2016;GEM, 2017;CAPRA, 2017;Michel et al, 2017;Trifunac, 2016;Hassanzadeh and Nedovic-Budic, 2016), in total 14 influencing criteria were identified (Table 1).…”

“…Furthermore, Bouckovalas and Papadimitriou (2005) investigated the influence of slope topography in amplifying the peak horizontal seismic ground acceleration suggesting high amplifications near the crest. Grelle et al (2016) presented formulae for topographic amplification on slope surface. These studies indicated that with the increase in slope angle the amplification factor would increase.…”

“…However, this seems simplistic, as it does not consider the elevation differences. Furthermore, Grelle et al (2016) presented an equation that considered the local slope height, relief height, regional share wave velocity, and relief ratio. In addition, several calibration constants should be calculated using 2-D numerical analysis for each study area to compute topographic effects on local seismic amplification.…”

“…Few researchers have considered direct properties of influencing factors in assessing ground-shaking amplification. Even in evaluating developed seismic response models such as SiSeRHMap v1.0 (Grelle et al, 2016) and the GIS cubic model (Grelle et al, 2014), the researchers have applied only lithodynamic, stratigraphic, and topographic effects as influencing factors. Furthermore, Aucelli et al (2018) suggested a method for producing susceptibility index to local seismic amplification in Isernia Province, Italy, and they have considered geological and geomorphological properties of studied areas.…”

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

“…Among the above-mentioned GIS-based models, Grelle et al (2014) have recently introduced a hybrid model, based on the "GIS cubic model (GCM)" frame which is, in turn, based on the concept of lithodynamic units and zones. Here, a lithodynamic unit is defined as a lithological unit, which is characterized by a shear wave velocity-depth-dependent curve (as shown in Fig.…”