Articles | Volume 12, issue 5
Nat. Hazards Earth Syst. Sci., 12, 1321–1325, 2012
Nat. Hazards Earth Syst. Sci., 12, 1321–1325, 2012

Research article 07 May 2012

Research article | 07 May 2012

Analysis the 1978–2008 crustal and sub-crustal earthquake catalog of Vrancea region

L. Telesca1, V. Alcaz2, and I. Sandu2 L. Telesca et al.
  • 1Consiglio Nazionale delle Ricerche, Istituto di Metodologie per l'Analisi Ambientale, C. da S. Loja, 85050 Tito (PZ), Italy
  • 2Moldavian Academy of Sciences, Institute of Geology and Seismology, Academiei str. 3, Chisinau, Moldova

Abstract. The crustal and sub-crustal seismicity that occurred in the Vrancea area from 1978 to 2008 is investigated. Due to quarry blast contamination, the analysis of the crustal seismicity was restricted to events that occurred between 20 km and 60 km, considering sub-crustal events as all those that occurred at depths larger than 60 km. The completeness magnitude was estimated between 2.3 and 2.5 for the crustal seismicity and between 2.9 and 3.1 for the sub-crustal one. The Gutenberg-Richter b-values show clear differences between crustal and sub-crustal seismicity, with values around 0.9 and 1.3–1.4, respectively. The analysis performed in this study represents a preliminary issue for the seismic hazard assessment of surrounding regions like Moldova, for which the earthquakes generated in Vrancea represent an important threat.