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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-28 3:10 |
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Conference: Bucharest University Faculty of Physics 2011 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Appraisal of a well-defined category of earthquakes: the intermediate-depth Vrancea events with NW-SE-striking fault-plane solution
Authors:
Nicoleta Cadicheanu (1),
Horia Mitrofan (1),
Mirela-Adriana Anghelache (1),
Constantin Marin (2),
Alin Tudorache (2)
Affiliation:
(1) Institute of Geodynamics of the Romanian Academy, Bucharest, Romania
(2) Institute of Speleology of the Romanian Academy, Bucharest, Romania
E-mail
nicoleta_cadichian@yahoo.com;
horia.mitrofan@geodin.ro
Keywords:
fault-plane solution, earthquake catalog, isoseismal map, hydrochemical precursor
Abstract:
It is a well-known fact that in terms of focal mechanisms, most intermediate-depth Vrancea earthquakes display: (1) a thrust deformation regime with vertical extension and horizontal compression (2) a fault-plane solution having both its nodal planes striking either NE–SW, or NW-SE. The fault-plane solutions striking NE–SW have been widely investigated so far, as they corresponded to all the instrumentally recorded Vrancea events with Mw≥6.5 (Nov 10, 1940; Mar 4, 1977; Aug 30, 1986; May 30, 1990). In contrast, in terms of the overall seismic regime of the Vrancea zone, earthquakes with fault-plane solutions striking NW-SE appeared to be of a smaller interest. Yet the earthquake categories associated to each of two indicated fault-plane directions have been shown to systematically differ from one another also with regard to their isoseismal maps pattern, as well as to precursory anomalies displayed by the chemical composition of certain nearby springs. Consequently, it was felt necessary to perform a detailed inventory of the Vrancea earthquakes with NW-SE striking fault-plane solutions, in order to assess their potential specific impact on the overall seismic hazard of that region.
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