HR: 1400h
AN: S43A-06    [Abstracts]
TI: A study of source parameters and attenuation of earthquakes in a regime of subduction in the east of Venezuela using Genetic Algorithms
AU: * Granado, C
EM: cgranado@funvisis.gob.ve
AF: FUNVISIS Venezuelan Foundation for Seismological Research, Caracas, Venezuela
AU: Vasquez, R
EM: rvasquez@funvisis.gob.ve
AF: FUNVISIS Venezuelan Foundation for Seismological Research, Caracas, Venezuela
AB: A sample of 50 earthquakes associated with the regime of subduction in the east of Venezuela has been analyzed in order to determine the following source parameters: seismic moment, stress drop and attenuation Q. The spectral content of the seismograms of this sample was studied with Brune´s model as a basic reference, while the numerical treatment- by means of Genetic Algorithms. The studied seismograms were obtained through the network of the Venezuelan Seismological Foundation, with FUNVISIS broadband sensors detecting noise signals for calculating Q. The spectral analysis of seismograms of this sample reveals preliminary values for M0 between 6.E+9 to 8.5E+12 Nm. When considering attenuation Q for frequencies of 2, 5, 4, 8 and 10 Hertz, a variable Q was obtained from 125 to 590, indicating a different tectonic behavior compared to a sample of superficial seismicity of greater attenuation for the same geographic region. Additionally, the correlation between Q(P) and Q(S) for the earthquakes of the relevant region was investigated.
DE: 7209 Earthquake dynamics (1242)
DE: 7215 Earthquake source observations (1240)
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
SC: Seismology [S]
MN: 2007 Joint Assembly