Site Effects and Microzonation in Acapulco

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

doi:10.1193/1.1585989

Cited by 21 publications

(13 citation statements)

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“…The paper addresses the issues arising from seismic response of rock mass ridges, taking into account methodologies developed to study the seismic response of soft soil sites in alluvial planes (Lachet et al, 1996;Chavez-Garcia and Cuenca, 1998;Frankel et al, 2002;Tuladhar et al, 2004) as well as evidences of amplification due to topographic effects (Geli et al, 1988;Chavez-Garcia et al, 1996Ashford et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Evidence of Amplification Effects in Fault Zone Related to Rock Mass Jointing

et al. 2006

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Results of geological, geomechanical and seismometric investigations aiming at the analysis of the seismic response in a carbonate ridge of the Nera River valley (Central Apennines -Italy) are discussed. Geological and geomechanical surveys were aimed at defining the stratigraphic and structural setting of the outcropping formations and the jointing conditions of the rock mass. Velocimetric records of both ambient noise and small-magnitude earthquakes were analysed in order to identify amplification conditions. The analysis was carried out in the time domain, through directional energy evaluation, and in the frequency domain, through H/V spectral ratios and spectral ratios with respect to a reference station. A local amplification factor was estimated from Housner intensity. The study revealed a significant seismic amplification in a fault zone. This effect was observed in intensely jointed and mylonitic rock masses, located inside moderately jointed rock masses, and is the result of specific geometries and significant impedance contrasts. A map of fault zones prone to amplification of ground motion was constructed, taking into account the jointing conditions of the rock masses and the structural setting of the investigated ridge. The study relied on an integrated methodological approach, which combined the available data under union and intersection criteria.

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Section: Introductionmentioning

confidence: 99%

Evidence of Amplification Effects in Fault Zone Related to Rock Mass Jointing

et al. 2006

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“…Nakamura (1989Nakamura ( , 2000 hypothesized that site response could be estimated from the spectral ratio of horizontal vs. vertical component of noise observed at the same site. Many studies show that the H/V ratio obtained from ambient vibrations coincides with response functions of near surface structures to incident shear wave (Ohmachi et al, 1991;Lermo and Chavez-Garcia, 1994;Zaslavsky et al, 1995;Gitterman et al, 1996;Seekins et al, 1996;Chavez-Garcia and Cuenca, 1998;Konno and Ohmachi 1998;Mucciarelli and Monachesi, 1998;Toshinava et al, 1997;Shapira et al, 2001). Recently, Bonilla et al (1997), Horike et al (2001) and contended that estimates of the frequency of the predominant peak are similar to those obtained from traditional sediment-to-bedrock spectral ratio of earthquake records (Borcherdt, 1970).…”

Section: Introductionmentioning

confidence: 91%

Site Response from Ambient Vibrations in the Towns of Lod and Ramle (Israel) and Earthquake Hazard Assessment

Zaslavsky

Shapira

Gorstein

et al. 2005

Bull Earthquake Eng

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Throughout their long history, the towns of Lod and Ramle have been severely affected by strong earthquakes. The last destructive earthquake occurred on July 11, 1927 and caused the destruction of large parts of these cities, reaching a seismic intensity of VIII-IX on the MSK scale. Such a high intensity from a relatively distant earthquake (about 70 km) of magnitude 6.2 is likely to be the result of local site effects of the sedimentary layers that may have significantly enhanced earthquake ground motions.This study is focused on estimating the seismic hazard to Lod and Ramle by implementing a three-step process: (1) detailed mapping of the characteristics of the H/V spectral ratios from ambient noise, (2) incorporating geological information and well data to construct subsurface models for different sites within the investigated area and (3) estimating the seismic hazard in terms of uniform hazard site-specific accelerations.The horizontal-to-vertical spectral ratios of ambient noise were used to approximate the fundamental resonance frequencies of the subsurface and their associated amplitudes. About 360 sites in Lod and Ramle were instrumented for varying periods. The soil sites exhibits H/V peak amplitudes ranging from 4 to 6 in the frequency range 0.5-2.5 Hz. These data were used to constrain 1-D subsurface models that were developed using geological data and borehole information. H/V spectral ratio observations were checked against theoretical subsurface transfer functions at locations where borehole information is available farther constraint the range of possible V s velocities of the different layers and thus, by means of trial an error it was possible to conclude a systematic spatial distribution of the V s velocity and thickness in the substrata that are also consistent with the spatial distribution of the fundamental resonance frequencies of the soft sediments obtained by means of the H/V spectral ratios, and other geological and geophysical information available at different locations in the study area.The evaluated subsurface models are introduced using the SEEH procedure of Shapira and van Eck [(1993) Natural Hazards 8, 201-205] to assess Uniform Hazard Site-Specific Acceleration Spectra for different zones within the towns of Lod and Ramle. These evaluations are very important for realistic assessment of the vulnerabilities of all types of existing and newly designed structures and for urban and land use planning. 356Y. ZASLAVSKY ET AL.

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“…Large numbers of seismic microzonation studies have been conducted in many earthquake prone areas of the world [4,8,[13][14][15][16]27,28,30,31]. However, few of these studies are well-documented in the literature.…”

Section: Introductionmentioning

confidence: 99%

Urban Seismic Microzonation Studies at Small Scales: Sisli/Istanbul (Turkey)

et al. 2011

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The main purpose of this study is to provide a high-resolution application of urban seismic microzonation. A probabilistic seismic hazard analysis was undertaken in the study area using Poisson probabilistic approaches. The resulting hazard is characterized by a 15% probability that a given level of acceleration will be exceeded in a 50-year period. Using deterministic seismic hazard analysis, the magnitudes were estimated by a quadruple rupture model (with three different fault lengths, 108, 119 and 174 km) of the North Anatolian Fault Zone in the Marmara Region. Using both analyses (deterministic and probabilistic), the magnitude of the design earthquake was taken as 7.6. From this design earthquake, accelerations were estimated for several distances (from 25 to 50 km) using several attenuation relationships. In the second phase of the study, soil amplification factors and site characteristic periods were determined and estimated by seismic measurements and Standard Penetration Test data for the Sisli area of central Istanbul. Microtremor and earthquake data were evaluated to compare the characteristic site period data obtained. According to Eurocode soil classifications, the study area mainly consists of B type soils. A small part of the study area has C and A type soils. Characteristic site periods obtained by seismic methods agree with strong (earthquake) and weak (ambient noise) motion spectral values in some parts of the study area. Finally, a seismic microzonation map was prepared for integrated use, incorporating all geophysical and geotechnical data.

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Site Effects and Microzonation in Acapulco

Cited by 21 publications

References 0 publications

Evidence of Amplification Effects in Fault Zone Related to Rock Mass Jointing

Evidence of Amplification Effects in Fault Zone Related to Rock Mass Jointing

Site Response from Ambient Vibrations in the Towns of Lod and Ramle (Israel) and Earthquake Hazard Assessment

Urban Seismic Microzonation Studies at Small Scales: Sisli/Istanbul (Turkey)

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