Identifying Strong-Motion Generation Areas of the 2007 Mw8.0 Pisco, Peru, Earthquake Using the Empirical Green's Function Method

Abstract eng:
The size of the strong motion generation areas (SMGA) and rise time for the Mw8.0 August 15, 2007 Pisco, Peru Earthquake were determined using the Empirical Green’s function method (EGFM) to synthetize waveforms in the frequency range between 0.1 and 1 Hz at seismic stations MOL and PRC. The criteria of Somerville et al. (1999) was applied to the slip distribution rupture model (Sladen et al, 2010) obtaining a two asperities source model as initial approach of the SMGAs. The observed waveforms of the mainshock were also divided in two wave packets to compute the contribution from each SMGA independently, by using two aftershocks (Mw5.6 and Mw5.0) as Empirical Green’s functions (EGF). The spectral analysis of the waveforms did not follow the omega-squared source spectra model, therefore the SMGAs (SMGA1 and SMGA2) were obtained by a grid searching, considering correlation coefficients and visual comparisons between the successive observed and synthetic waveforms. The agreement between the observed and synthesized waveforms from SMGA2 were poor, compared with those for SMGA1, moreover the source area parameters and amount of average slips for asperities followed the scaling laws for interplate earthquakes.

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