SOURCE CHARACTERISTICS OF THE SINAIA (ROMANIA) SEQUENCE OF MAY JUNE 1993

A particular sequence of crustal earthquakes (h < 10 km, M(L) < 5.1) o ccurred in the southwestern extremity of the Eastern Carpathian are be nd (Sinaia region) starting on May 4, 1993. The main shock (M(L) 5.1) occurred on May 23 after significant 20-day foreshock activity. The fi rst locations delineate an epicentral area of approximately 225 km(2), elongated in a NW-SE direction, which agrees with the fault plane sol ution for the main shock. The digital recordings of the Romanian telem etered network are analyzed in order to estimate source parameters and to investigate scaling relations. An empirical deconvolution techniqu e and the spectral ratio method are used for this purpose. The main re sults, such as (1) the departure from a M(0)(1/3) scaling of the sourc e radius as a function of the seismic moment, (2) the scaling of the p eak velocity parameter as a function of local magnitude and (3) the sc aling of the dynamic stress drop with earthquake size, are interpreted in terms of an inhomogeneous source model.