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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:19 |
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Conference: Bucharest University Faculty of Physics 2010 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Source parameters of the crustal moderate earthquakes occurred between 2007 and 2009, in the south-eastern part of Romania
Authors:
E. Popescu, M. Radulian, F. Borleanu, Maria Rogozea
Affiliation:
National Institute for Earth Physics, P.O.Box MG-2, Calugareni 12, Bucharest-Magurele, 077125, Romania,
E-mail
epopescu@infp.ro
Keywords:
aftershock, deconvolution, empirical Green’s functions
Abstract:
Moderate-size crustal earthquakes recently generated in the south-eastern part of Romania, are located in four distinct areas: Ramnicu Sarat zone – 2 sequences on November 29, 2007 (main shock, 45.62oN, 27.22oE, h=19 km, M = 3.9) and December 6, 2009 (main shock, 45.39oN, 26.98oE, h=25 km, M = 4.2); Vrancioaia zone – one sequence on September 6, 2008 in (main shock, 45.80oN, 26.51oE, h=13 km, M = 4.4); Bucharest-Giurgiu zone - one earthquake and an associated aftershock on June 20, 2009 (44.17oN, 25.72oE, h=15 km, M = 3.9) and June 22, 2009, respectively; Fagaras (Voina) zone – one event on March 30, 2008 (45.29oN, 24.82oE, h=2 km, M = 3.3) with an associated aftershock in the same day. In all cases, for the main shocks we found well-recorded aftershocks with similar location and focal mechanism (empirical Green’s functions). The difference of about 1.0 magnitude unit between the main shocks and the largest aftershocs is typical for the aftershock activity in the crustal domain and allows us to use the empirical Green’s function deconvolution and spectral ratios techniques. The purpose of the present paper is to apply these techniques for the crustal earthquakes in the south-eastern part of Romania. Despite the relative small size of the events, high-quality waveforms for pairs of co-located events are available in different sites. The new results, together with previous determinations provides an excellent database to investigate the source scaling properties.
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