Realistic modelling of observed seismic motion in compIex sedimentary basins
Three applications of a numerical technique are illustrated to model realistically the seismic ground motion for complex two-dimensional structures. First we consider a sedimentary basin in the Friuli region, and we model strong motion records from an aftershock of the 1976 earthquake. Then we simul...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Istituto Nazionale di Geofisica e Vulcanologia (INGV)
1994-06-01
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| Series: | Annals of Geophysics |
| Subjects: | |
| Online Access: | http://www.annalsofgeophysics.eu/index.php/annals/article/view/4141 |
| _version_ | 1819296034288828416 |
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| author | G. F. Panza D. Fah |
| author_facet | G. F. Panza D. Fah |
| author_sort | G. F. Panza |
| collection | DOAJ |
| description | Three applications of a numerical technique are illustrated to model realistically the seismic ground motion for complex two-dimensional structures. First we consider a sedimentary basin in the Friuli region, and we model strong motion records from an aftershock of the 1976 earthquake. Then we simulate the ground motion caused in Rome by the 1915, Fucino (Italy) earthquake, and we compare our modelling with the damage distribution observed in the town. Finally we deal with the interpretation of ground motion recorded in Mexico City, as a consequence of earthquakes in the Mexican subduction zone. The synthetic signals explain the major characteristics (relative amplitudes, spectral amplification, frequency content) of the considered seismograms, and the space distribution of the available macroseismic data. For the sedimentary basin in the Friuli area, parametric studies demonstrate the relevant sensitivity of the computed ground motion to small changes in the subsurface topography of the sedimentary basin, and in the velocity and quality factor of the sediments. The relative Arias Intensity, determined from our numerical simulation in Rome, is in very good agreoment with the distribution of damage observed during the Fucino earthquake. For epicentral distances in the range 50 km-100 km, the source location and not only the local soil conditions control the local effects. For Mexico City, the observed ground motion can be explained as resonance effects and as excitation of local surface waves, and the theoretical and the observed maximum spectral amplifications are very similar. In general, our numerical simulations estimate the maximum and average spectral amplification for specific sites, i.e. they are a very powerful tool for accurate micro-zonation |
| first_indexed | 2024-12-24T04:51:41Z |
| format | Article |
| id | doaj.art-7e564f1eceaa4b98a6ff337a79ad92a5 |
| institution | Directory Open Access Journal |
| issn | 1593-5213 2037-416X |
| language | English |
| last_indexed | 2024-12-24T04:51:41Z |
| publishDate | 1994-06-01 |
| publisher | Istituto Nazionale di Geofisica e Vulcanologia (INGV) |
| record_format | Article |
| series | Annals of Geophysics |
| spelling | doaj.art-7e564f1eceaa4b98a6ff337a79ad92a52022-12-21T17:14:31ZengIstituto Nazionale di Geofisica e Vulcanologia (INGV)Annals of Geophysics1593-52132037-416X1994-06-0137610.4401/ag-4141Realistic modelling of observed seismic motion in compIex sedimentary basinsG. F. PanzaD. FahThree applications of a numerical technique are illustrated to model realistically the seismic ground motion for complex two-dimensional structures. First we consider a sedimentary basin in the Friuli region, and we model strong motion records from an aftershock of the 1976 earthquake. Then we simulate the ground motion caused in Rome by the 1915, Fucino (Italy) earthquake, and we compare our modelling with the damage distribution observed in the town. Finally we deal with the interpretation of ground motion recorded in Mexico City, as a consequence of earthquakes in the Mexican subduction zone. The synthetic signals explain the major characteristics (relative amplitudes, spectral amplification, frequency content) of the considered seismograms, and the space distribution of the available macroseismic data. For the sedimentary basin in the Friuli area, parametric studies demonstrate the relevant sensitivity of the computed ground motion to small changes in the subsurface topography of the sedimentary basin, and in the velocity and quality factor of the sediments. The relative Arias Intensity, determined from our numerical simulation in Rome, is in very good agreoment with the distribution of damage observed during the Fucino earthquake. For epicentral distances in the range 50 km-100 km, the source location and not only the local soil conditions control the local effects. For Mexico City, the observed ground motion can be explained as resonance effects and as excitation of local surface waves, and the theoretical and the observed maximum spectral amplifications are very similar. In general, our numerical simulations estimate the maximum and average spectral amplification for specific sites, i.e. they are a very powerful tool for accurate micro-zonationhttp://www.annalsofgeophysics.eu/index.php/annals/article/view/4141wave-propagation modellingseismic strong ground motionsedimentary basinseismic micro-zonation |
| spellingShingle | G. F. Panza D. Fah Realistic modelling of observed seismic motion in compIex sedimentary basins Annals of Geophysics wave-propagation modelling seismic strong ground motion sedimentary basin seismic micro-zonation |
| title | Realistic modelling of observed seismic motion in compIex sedimentary basins |
| title_full | Realistic modelling of observed seismic motion in compIex sedimentary basins |
| title_fullStr | Realistic modelling of observed seismic motion in compIex sedimentary basins |
| title_full_unstemmed | Realistic modelling of observed seismic motion in compIex sedimentary basins |
| title_short | Realistic modelling of observed seismic motion in compIex sedimentary basins |
| title_sort | realistic modelling of observed seismic motion in compiex sedimentary basins |
| topic | wave-propagation modelling seismic strong ground motion sedimentary basin seismic micro-zonation |
| url | http://www.annalsofgeophysics.eu/index.php/annals/article/view/4141 |
| work_keys_str_mv | AT gfpanza realisticmodellingofobservedseismicmotionincompiexsedimentarybasins AT dfah realisticmodellingofobservedseismicmotionincompiexsedimentarybasins |