Empirical evaluation of site effects in the metropolitan area of San José, Costa Rica

Moya, Aarón; Schmidt, Víctor; Segura, Carlos Humberto Cascante; Boschini, Ileana; Atakan, Kuvvet

doi:10.1016/s0267-7261(00)00049-x

Cited by 18 publications

(5 citation statements)

References 10 publications

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“…There exist, however, a few cases of disagreement: either H/V curves are flat and fail to exhibit the amplification witnessed by other techniques (Moya et al 2000;Haghshenas et al 2003), or the frequency of the H/V peak is different from values indicated by other techniques (Volant et al 1998;Zaré et al 1999;Haghshenas et al 2003;Maresca et al 2003). Satoh et al (2001) also report a case where the correlation of H/V peak frequency and fundamental frequency of site exhibits some restrictions: microtremor H/V peak frequencies roughly coincide with those of receiver function and SSR for S-waves only for frequencies lower than 1 Hz and peak amplitude larger than 3.…”

Section: Previous Experimental Results: a Short Reviewmentioning

confidence: 98%

Empirical evaluation of microtremor H/V spectral ratio

Haghshenas

Bard

Theodulidis

et al. 2008

Bull Earthquake Eng

229

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International audienceThe objective of this work is to perform a purely empirical assessment of the actual capabilities of the horizontal-to-vertical (H/V) spectral ratio technique to provide reliable and relevant information concerning site conditions and/or site amplification. This objective has been tackled through the homogeneous (re)processing of a large volume of earthquakes and ambient noise data recorded by different research teams in more than 200 sites located mainly in Europe, but also in the Caribbean and in Tehran. The original recordings were first gathered in a specific database with information on both the sites and recorded events. Then, for all sites close to an instrumented reference, average site-to-reference spectral ratios (“spectral ratio method” (SSR)) were derived in a homogeneous way (window selection, smoothing, signal-to-noise ratio threshold, averaging), as well as H/V ratios (“HVSRE–RF”) on earthquake recordings. H/V ratios were also obtained from noise recordings at each site (either specific measurements, or extracted from pre- or post-event noise windows). The spectral curves resulting from these three techniques were estimated reliable for a subset of 104 sites, and were thus compared in terms of fundamental frequency, amplitude and amplification bandwidth, exhibiting agreements and disagreements, for which interpretations are looked for in relation with characteristics of site conditions. The first important result consists in the very good agreement between fundamental frequencies obtained with either technique, observed for 81% of the analyzed sites. A significant part of the disagreements correspond to thick, low frequency, continental sites where natural noise level is often very low and H/V noise ratios do not exhibit any clear peak. The second important result is the absence of correlation between H/V peak amplitude and the actual site amplification measured on site-to-reference spectral ratios. There are, however, two statistically significant results about the amplitude of the H/V curve: the peak amplitude may be considered as a lower bound estimate of the actual amplification indicated by SSR (it is smaller for 79% of the 104 investigated sites), and, from another point of view, the difference in amplitude exhibits a questioning correlation with the geometrical characteristics of the sediment/basement interface: large SSR/HV differences might thus help to detect the existence of significant 2D or 3D effects

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Section: Previous Experimental Results: a Short Reviewmentioning

confidence: 98%

Empirical evaluation of microtremor H/V spectral ratio

Haghshenas

Bard

Theodulidis

et al. 2008

Bull Earthquake Eng

229

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“…Señales de sismos lejanos registrados tanto en AALJ como en SECA se caracterizan por poseer amplitudes comparativamente mayores a las de otras estaciones ubicadas en ciudades vecinas como HOVS y SLPF, esta última al este de San José (Moya et al, 1999;Schmidt et al, 2005). El caso de HOVS contrasta con el de AALJ tal y como se aprecia en la figura 4.…”

Section: Discusión Y Resultadosunclassified

“…El instrumento en la estación SLPF es el único del tipo K2 que formaba parte de una red local de movimiento fuerte llamada Red SAN (Moya et al, 1999). El resto de las estaciones de la tabla 1 poseen un aparato tipo ETNA y en algunas ocasiones tuvieron un aparato tipo QDR en forma temporal.…”

Section: Red De Movimiento Fuerteunclassified

Inversión de efectos de sitio y factor Q utilizando cocientes espectrales

Fernández¹

2009

Estud. geol.

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Site effects and Q factor were inverted using the spectral ratio technique. The study area corresponds to central Costa Rica where the Earthquake Engineering Laboratory (INII-UCR) runs a strong motion network. The technique differs from the usual approach in that it makes use of a reference earthquake instead of a reference site. For that reason, the amplitude of the site effects that are obtained corresponds to the absolute amplification. The results indicate that stations located on soft sediment sites tend to have larger amplification values compared to other stations located on more compacted soils. The Q factor we obtained was frequency dependent with an approximate value of Q(f) = (131,6 ± 0,1)f (1,1 ± 0,2) .

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“…The importance of site characterization of urban or metropolitan areas is recognized worldwide, with several studies performed in New York (Stephenson et al, 2009), Taipei (Wang, 2008), Perth (Liang et al, 2009), Seoul (Sun et al, 2014;Kim et al, 2017), Beijing (Liu et al, 2014), Vancouver (Molnar et al, 2020), San Josè, Costa Rica (Moya et al, 2000), Istanbul (Picozzi et al, 2009;Ansal et al, 2010), Memphis (Schneider et al, 2001), Bucharest , among others.…”

Section: Introductionmentioning

confidence: 99%

New Challenges for Seismic Risk Mitigation in Urban Areas

Barani¹,

Akinci²,

Şeşetyan³

et al. 2022

Frontiers Research Topics

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Empirical evaluation of site effects in the metropolitan area of San José, Costa Rica

Cited by 18 publications

References 10 publications

Empirical evaluation of microtremor H/V spectral ratio

Empirical evaluation of microtremor H/V spectral ratio

Inversión de efectos de sitio y factor Q utilizando cocientes espectrales

New Challenges for Seismic Risk Mitigation in Urban Areas

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