Site effect evaluation at Mexico City: Dominant period and relative amplification from strong motion and microtremor records

Lermo, J.; Chávez-García, Francisco J.

doi:10.1016/0267-7261(94)90012-4

Cited by 99 publications

(42 citation statements)

References 10 publications

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“…At other sites, which are faced with considerably simpler structural geometry, similar 1-D modelling produces reasonable results (FIELD et al, 1992;LERMO and CHÁ VEZ-GARCÍA, 1994). However, our results give a good approximation of the lowest resonant frequency.…”

Section: Obser6ations and Discussion Regarding The 1-d Modellingcontrasting

confidence: 48%

About the Efficiency of Numerical 1-D and 2-D Modelling of Site Effects in Basin Structures

Riepl

Zahradnı́k

Plicka

et al. 2000

Pure and Applied Geophysics

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In the present study we compare results obtained from experimental estimates of local site amplification effects with those from numerical modelling using four different techniques. We benefit from an extremely precise knowledge of the near-surface structure and experimental estimates of the local amplification factors which are determined from seismic weak-motion data recorded by a dense array across a sedimentary basin at a European test-site in Northern Greece. The possibilities and limitations of the different modelling techniques (a 1-D technique, and three 2-D techniques) to model the effects of local amplification effects are tested. Amplifications calculated by the numerical techniques are only qualitatively compared with observed data from experimental studies in the time domain and directly in the frequency domain.As a result we conclude that, in the case of a complex subsurface geometry, 1-D modelling underestimates the amplification patterns in terms of absolute amplification level, and cannot correctly account for resonant frequencies, at least for modes higher than the fundamental mode. If a more realistic incident wave field than just a plane wave is taken into account, 2-D modelling reveals the fundamental frequency and shows adequate amplifications not only at the fundamental frequency but also at higher frequencies. The general trend of the amplifications at the lowest frequencies is well determined by the 2-D numerical modelling, and can therefore supply information for seismic risk analysis.

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Section: Obser6ations and Discussion Regarding The 1-d Modellingcontrasting

confidence: 48%

About the Efficiency of Numerical 1-D and 2-D Modelling of Site Effects in Basin Structures

Riepl

Zahradnı́k

Plicka

et al. 2000

Pure and Applied Geophysics

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“…In this study, we use the so-called Nakamura's technique [Nakamura, 1989] based on the calculation of horizontal-to-vertical component spectral ratios (H/V) from ambient noise measurements. For a complete overview of the method, its assumptions and its limitations, the reader is referred to Lachet and Bard [1994] and Lermo and Chávez-García [1994]. It has been shown to be an efficient way to determine the dominant resonance frequency of a site [e.g.…”

Section: Site Effects At Strong-motion Stationsmentioning

confidence: 99%

A preliminary investigation of strong-motion data from the French Antilles

et al. 2006

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Strong-motion networks have been operating in the Caribbean region since the 1970s, however, until the mid-1990s only a few analogue stations were operational and the quantity of data recorded was very low. Since the mid-1990s, digital accelerometric networks have been established on islands within the region. At present there are thought to be about 160 stations operating in this region with a handful on Cuba, 65 on the French Antilles (mainly Guadeloupe and Martinique), eight on Jamaica, 78 on Puerto Rico (plus others on adjacent islands) and four on Trinidad.After briefly summarising the available data from the Caribbean islands, this article is mainly concerned with analysing the data that has been recorded by the networks operating on the French Antilles in terms of their distribution with respect to magnitude, source-to-site distance, focal depth and event type; site effects at certain stations; and also with respect to their predictability by ground motion estimation equations developed using data from different regions of the world. More than 300 good quality triaxial acceleration time-histories have been recorded on Guadeloupe and Martinique at a large number of stations from earthquakes with moment magnitudes larger than 4.8, however, most of the records are from considerable source-to-site distances. From the data available it is found that many of the commonly-used ground motion estimation equations for shallow crustal earthquakes poorly estimate the observed ground motions on the two islands; ground motions on Guadeloupe and Martinique have smaller amplitudes and are more variable than expected. This difference could be due to regional dependence of ground motions because of, for example, differing tectonics or crustal structures or because the ground motions so far recorded are, in general, from smaller earthquakes and greater distances than the range of applicability of the investigated equations.

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“…KAGAMI et al (1982KAGAMI et al ( , 1986 and FIELD et al (1990) demonstrated also that simultaneous observation of the spectra of ambient noise was appropriate to identify the fundamental frequency in surface layers. The comparison between the fundamental frequency obtained of the ambient noise H/V spectral ratios and receiver functions of earthquake recording (strong or weak motion data) allowed researchers (LERMO et al 1988;LERMO and CHA´VEZ-GARCI´A, 1994b;FIELD and JACOB, 1995;CHA´VEZ-GARCI´A and CUENCA, 1996;TOSHINAWA et al 1997;OJEDA and ESCALLON, 2000;DUVAL et al 2001;SATOH et al 2001;HORIKE et al 2001) to report that the fundamental frequencies of ambient noise spectral ratios agree with the fundamental frequencies observed in earthquake motions and give a good estimation of the fundamental frequency of the site. YAMANAKA et al (1993) found a very good agreement between the sediment-to-bedrock spectral ratios (hereafter refered to as SSR ratios) from strong motion data and ambient noise at periods more than 5 sec in Los Angeles, California.…”

Section: Introductionmentioning

confidence: 99%

Reliability of Ambient Noise Horizontal-to-Vertical Spectral Ratio in Urban Environments: The Case of Thessaloniki City (Northern Greece)

Panou

Theodulidis

Hatzidimitriou

et al. 2005

Pure appl. geophys.

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In the framework of an ambient noise measurement project in the downtown district of the City of Thessaloniki (Northern Greece), several tests and evaluation of noise recordings were performed in selected sites. This data set was processed and compared with previous results for the same sites in terms of horizontal-to-vertical (H/V) spectral ratio obtained from weak and strong motion earthquake data. The recording system used was tested against a reference one. Finally, systematic ambient noise measurements were performed at eight sites in the city's downtown area, to evaluate diurnal and seasonal variations. It was concluded that the recording system used was reliable and the ambient noise H/V spectral ratios were in good agreement with relevant results previously obtained. Diurnal variation of the ambient noise H/V spectral ratio showed that it is preferable to perform measurements during the calm hours of the day, when man-made noise is relatively low. However, no systematic seasonal fluctuation effect on the ambient noise H/V spectral ratio was identified.

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Site effect evaluation at Mexico City: Dominant period and relative amplification from strong motion and microtremor records

Cited by 99 publications

References 10 publications

About the Efficiency of Numerical 1-D and 2-D Modelling of Site Effects in Basin Structures

About the Efficiency of Numerical 1-D and 2-D Modelling of Site Effects in Basin Structures

A preliminary investigation of strong-motion data from the French Antilles

Reliability of Ambient Noise Horizontal-to-Vertical Spectral Ratio in Urban Environments: The Case of Thessaloniki City (Northern Greece)

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