A Parametric Analysis of The Seismic Input At NE Bulgaria (russe Site) Due To Recent Vrancea Intermediate - Depth Earthquakes.
Abstract
An analytical deterministic technique, based on the simultaneous account of the fault mechanism and seismic wave propagation, has been applied to generate synthetic seis- mic signals at Russe, NE Bulgaria due to the strongest intermediate-depth Vrancea earthquakes, which occurred during the last century (1940, 1977, 1986 and 1990). The computations have been validated by comparison with the available observations, i.e. accelerograms and macroseismic intensity data. The synthetic signals have been gen- erated varying the seismic source moment tensor and the Vp/Vs ratio of the uppermost layers along the investigated profile. Response and energetic spectra are calculated for the whole synthetic signals set. The obtained results show that all ground motion components give a significant contribution to the seismic input and that they can be influenced in similar degree by the investigated parameters. Therefore the seismic in- put (also at remote distances), should consider enough earthquake scenarios, and can be constructed via waveform modelling, considering all possible factors influencing the ground motion.
- Publication:
-
EGS General Assembly Conference Abstracts
- Pub Date:
- 2002
- Bibcode:
- 2002EGSGA..27.5581K