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- W2915672787 abstract "This paper aims at evaluating the effectiveness of some numerical techniques used for ground motion modeling. The focus of the analysis in the paper is on the site of the Catania ENEA-ENEL accelerometric station that recorded the M = 5.8 Eastern Sicily earthquake on December 13, 1990. The recorded seismogram features an anomalously high amplitude, which was interpreted as a possible effect of crustal structure or site response. In the first part of the paper, the authors compare the recorded seismograms to those computed numerically by the 2-D Spectral Element Method (SPEM), a technique which solves the 2-D full-wave propagation through a complex geological structure. The agreement is very good. Next, the authors show that any plane layer representation, which simplifies the same structure, does not provide a comparable agreement. In this case, synthetic seismograms are computed by the wavenumber integration method. Finally, the authors compare the H/V spectral ratios (HVSR) obtained from: (1) seismic noise; (2) the earthquake record; and (3) the seismogram simulated by the SPEM. Again, the overall agreement is very good. However, microtremor HVSR identify well the fundamental mode of vibration near 1.5 Hz well, but miss a peak at higher frequencies. The study has several outcomes. First, it demonstrates that the whole approach based on the SPEM and used in a previous study to simulate the ground shaking for a destructive scenario earthquake provides reliable results. Second, the paper shows that the model used to represent the crustal structure beneath the area is realistic. Indeed, simplified models do not predict the site response adequately. Finally, the paper explains the high amplitude displayed by the Catania station during the 1990 earthquake as a combined effect of site and structure-path." @default.
- W2915672787 created "2019-03-02" @default.
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- W2915672787 date "2005-01-01" @default.
- W2915672787 modified "2023-09-24" @default.
- W2915672787 title "Numerical Modelling of the December 13, 1990, M=4.8 Eastern Sicily Earthquake" @default.
- W2915672787 hasPublicationYear "2005" @default.
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