Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/7400
Authors: | Ameri, G.* Oth, A.* Pilz, M.* Bindi, D.* Parolai, S.* Luzi, L.* Mucciarelli, M.* Cultrera, G.* |
Title: | Separation of source and site effects by Generalized Inversion Technique using the aftershock recordings of the 2009 L'Aquila earthquake | Journal: | Bulletin of Earthquake Engineering | Series/Report no.: | 3/9(2011) | Publisher: | Springer | Issue Date: | Jun-2011 | DOI: | 10.1007/s10518-011-9248-4 | Keywords: | Generalized Inversion Technique 2009 L'Aquila earthquake |
Subject Classification: | 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion |
Abstract: | We exploit S-wave spectral amplitudes from 112 aftershocks (3.0 ≤ ML ≤ 5.3) of the L’Aquila 2009 seismic sequence recorded at 23 temporary stations in the epicentral area to estimate the source parameters of these events, the seismic attenuation characteristics and the site amplification effects at the recording sites. The spectral attenuation curves exhibit a very fast decay in the first few kilometers that could be attributed to the large attenuation of waves traveling trough the highly heterogeneous and fractured crust in the fault zone of the L’Aquila mainshock. The S-waves total attenuation in the first 30 km can be parameterized by a quality factor QS(f) = 23f^0.58 obtained by fixing the geometrical spreading to 1/R. The source spectra can be satisfactorily modeled using the omega-square model that provides stress drops between 0.3 and 60 MPa with a mean value of 3.3±2.8 MPa. The site responses show a large variability over the study area and significant amplification peaks are visible in the frequency range from 1 to more than 10 Hz. Finally, the vertical component of the motion is amplified at a number of sites where, as a consequence, the horizontal-to-vertical spectral ratios (HVSR) method fails in detecting the amplitude levels and in few cases the resonance frequencies. |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | Existing users please Login |
---|---|---|---|---|
Ameri_2011_BEE_Aquila.pdf | 5.7 MB | Adobe PDF |
WEB OF SCIENCETM
Citations
24
checked on Feb 10, 2021
Page view(s)
146
checked on Mar 16, 2024
Download(s)
23
checked on Mar 16, 2024