Parametric test for the impact of May 30, 1990 Vrancea earthquake on Cahul area
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SANDU, Ilie; ALCAZ, Vasile; MURA, CristinaLa; PANZA, Giuliano. Parametric test for the impact of May 30, 1990 Vrancea earthquake on Cahul area. In: Buletinul Institutului de Geologie şi Seismologie al AŞM. 2012, nr. 1, pp. 33-46. ISSN 1857-0046.
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Buletinul Institutului de Geologie şi Seismologie al AŞM
Numărul 1 / 2012 / ISSN 1857-0046

Parametric test for the impact of May 30, 1990 Vrancea earthquake on Cahul area

Pag. 33-46

Sandu Ilie, Mura CristinaLa, Panza Giuliano, Alcaz Vasile
 
Institutul de Geologie şi Seismologie al AŞM
 
Disponibil în IBN: 28 noiembrie 2013


Rezumat

The systematic observations of seismic activity on the territory of the Republic of Moldova show the influence of strong seismic events generated in Vrancea zone (south-eastern Carpathian Mts.). This fact is used for hazard and risk estimation, which involves (probabilistic approach, at local and regional scales). The probabilistic approach uses attenuation law as an approximation of the seismic field, and does not consider all source and site effects, therefore, a detailed deterministic analysis is required to fix corrections and gaps for more realistic seismic risk assessment of the territory of the Republic of Moldova. With this purpose as a starting point, we perform a full parametric study for the city of Cahul, located in the southern part of the country, and its surrounding area. The analysis is done in the framework of 1D approximation, i.e. the analyzed region is modeled with a stack of isotropic, homogeneous and inelastic layers. The parametric test shows that the local structure has primary influence on local seismic impact, and geological, tectonic and geophysical data are the key factors, which distinguish the seismic field from site to site. At the regional scale, the seismic wave-field is different from site to site due to the directivity effects of the source. This aspect can be extended in order to perform a more realistic scenario for the entire territory of the Republic of Moldova.