Bodiakin E.V.   Peretokin S.A.   Simonov K.V.  

Evaluation of Seismic Hazard Using Seismic Microzonation Methods

Reporter: Bodiakin E.V.

It was shown the technique of seismic hazard assessment based on comprehensive use of methods of seismic microzonation .

This technique consists of four steps. The first step is to collect geological, seismological, geophysical and topographic information. Each layer according to geological engineering survey and geophysical work are assigned physical and mechanical properties (density, limit shear stress) and the P- and S- wave velocity. Next (step 2) after visualization and examination input data using GIS technologies 3D modelling of the geological environment is performed (it is created a grid each point of which is referred to coordinates of the site). The number and depth of soil are set in each point based on geological drilling data. Then (step 3) at each point seismic intensity are calculated using instrumental methods including method of acoustic impedance and computer simulation (GRUNT program). At the last stage according to the analysis of the results of theoretical and instrumental methods seismic microzonation map are created using GIS technologies (Fig. 1). The procedure of constructing maps uses different methods of selection areas with the same seismic hazard (kriging, spline interpolation).