Comparison of three methods to study the wavefield in the valley of Mexico using data from dense arrays
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| Format: | Artículo científico |
| Langue: | en |
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Sociedad Mexicana de Ingeniería Sísmica
2005
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| _version_ | 1876438822028312576 |
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| author | Agathe Roullé |
| author_facet | Agathe Roullé |
| contents | Comparison of three methods to study the wavefield in the valley of Mexico using data from dense arrays Agathe Roullé Francisco J. Chávez-García Ingeniería Observed seismic motion in the lakebed zone of the Valley of Mexico is complex because of thelarge epicentral distance, an irregular 3D crustal structure, large noise levels, strong site effects, andthe possible presence of mixed modes and multipathing. These conditions tax the possibilities of thearray-processing techniques. In this paper, we test three methods to determine the most appropriateto analyze the data from a new dense accelerograph array, recently installed in Colonia Roma ofMexico City: the conventional frequency-wavenumber (f-k) method, the maximum-likehood f-kmethod and the Multiple Signal Characterization technique (MUSIC). Tests with synthetic datashow that the f-k methods are more robust in presence of mixed signals but that MUSIC has betterresolution and is less sensitive to noise. Results from data analysis show the superiority of theconventional f-k method in case of data with small coherence and large spatial aliasing, whileMUSIC is more useful in case of data with high coherence and small time delays. Our results showthat the wavefield includes slow diffracted waves coming mainly from south to west at shortperiods and faster waves from the epicenter at long periods. These observations support the ideathat the observed large duration of ground motion is explained by the interaction of different modesof surface waves, arriving at different times at Mexico City, with the resonance of the clay layer. 2005 artículo científico 0185-092X https://www.redalyc.org/articulo.oa?id=61807302 en http://www.redalyc.org/revista.oa?id=618 Revista de Ingeniería Sísmica application/pdf Sociedad Mexicana de Ingeniería Sísmica Revista de Ingeniería Sísmica (México) Num.73 |
| format | Artículo científico |
| id | redalyc_61807302 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Sociedad Mexicana de Ingeniería Sísmica |
| spellingShingle | Comparison of three methods to study the wavefield in the valley of Mexico using data from dense arrays Agathe Roullé Ingeniería Comparison of three methods to study the wavefield in the valley of Mexico using data from dense arrays Agathe Roullé Francisco J. Chávez-García Ingeniería Observed seismic motion in the lakebed zone of the Valley of Mexico is complex because of thelarge epicentral distance, an irregular 3D crustal structure, large noise levels, strong site effects, andthe possible presence of mixed modes and multipathing. These conditions tax the possibilities of thearray-processing techniques. In this paper, we test three methods to determine the most appropriateto analyze the data from a new dense accelerograph array, recently installed in Colonia Roma ofMexico City: the conventional frequency-wavenumber (f-k) method, the maximum-likehood f-kmethod and the Multiple Signal Characterization technique (MUSIC). Tests with synthetic datashow that the f-k methods are more robust in presence of mixed signals but that MUSIC has betterresolution and is less sensitive to noise. Results from data analysis show the superiority of theconventional f-k method in case of data with small coherence and large spatial aliasing, whileMUSIC is more useful in case of data with high coherence and small time delays. Our results showthat the wavefield includes slow diffracted waves coming mainly from south to west at shortperiods and faster waves from the epicenter at long periods. These observations support the ideathat the observed large duration of ground motion is explained by the interaction of different modesof surface waves, arriving at different times at Mexico City, with the resonance of the clay layer. 2005 artículo científico 0185-092X https://www.redalyc.org/articulo.oa?id=61807302 en http://www.redalyc.org/revista.oa?id=618 Revista de Ingeniería Sísmica application/pdf Sociedad Mexicana de Ingeniería Sísmica Revista de Ingeniería Sísmica (México) Num.73 |
| title | Comparison of three methods to study the wavefield in the valley of Mexico using data from dense arrays |
| topic | Ingeniería |
| url | https://www.redalyc.org/articulo.oa?id=61807302 |