Developing a Map of Geologically Defined Site-Condition Categories for California

Wills, Christopher; Clahan, Kevin B.

doi:10.1785/0120050179

Cited by 222 publications

(211 citation statements)

References 15 publications

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“…We apply amplitude-dependent amplification factors as a function of V S30 (Borcherdt 1994) with NEHRP class B/C as a reference (Wills and Clahan 2006); this reference agrees well with the attenuation relation for rock condition in Equation 1 (Sokolov et al 2008). Figure 8 shows shake maps calculated from the two approaches for site amplification mapping, on the left using the topographic slope (Wald and Allen 2007), on the right using the seismological method developed in this paper.…”

Section: Comparison With Wald and Allen (2007)supporting

confidence: 53%

Shake Map Methodology for Intermediate-Depth Vrancea (Romania) Earthquakes

2009

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We establish and test a shake map methodology for intermediate-depth Vrancea earthquakes, based on seismological information gathered in Romania during recent years. We use region-(azimuth-) dependent attenuation relations derived from stochastic simulations of ground motions using spectral models of Vrancea earthquakes. Both region boundaries and Fourier amplification spectra for the characterization of seismic site effects are based on several hundred weak, moderate and strong-motion records and macroseismic intensity maps. We determine region-specific, magnitude-and distance-dependent amplification factors of peak values and instrumental intensity relative to rock. We interpolate recorded ground motions and ground motion estimates from the obtained amplification factors and attenuation relations for rock conditions. The resulting shake maps show a good agreement with macroseismic descriptions of moderate-sized and large Vrancea earthquakes, demonstrating the feasibility of a seismological approach to shake map generation. Unlike previous methodologies, this approach requires neither expensive assessments of geology-dependent site amplification factors, nor large numbers of strong-motion records. Our results are in good agreement with empirical topographic slope-site amplification relations, but give a better reflection of the abnormal attenuation of seismic waves in the Transylvanian region and the strong amplification in the Focsani basin.

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Section: Comparison With Wald and Allen (2007)supporting

confidence: 53%

Shake Map Methodology for Intermediate-Depth Vrancea (Romania) Earthquakes

2009

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“…Iwahashi et al [46] presented a correlation between V S30 measurements and several topographic parameters, including topographic heights, slope gradient, local convexity, and surface texture. Other authors have proposed different approaches based on geomorphological units [47], geotechnical categories [48] and geological units [49][50][51], as a proxy for V S30 assessment. More recently, Thompson et al [52] proposed a V S30 map for California, United States, using a hybrid geostatistical approach to account for geology, topography, and site-specific shear wave velocity measurements.…”

Section: Assessment Of Seismic Site Effectsmentioning

confidence: 99%

Geospatial Big Data-Based Geostatistical Zonation of Seismic Site Effects in Seoul Metropolitan Area

Kim

Sun

Cho

2017

IJGI

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Seismic site effects are influenced mainly by geospatial uncertainties corresponding to geological or geotechnical spatial variance. Therefore, the development of a geospatial database is essential to characterize site-specific geotechnical information in multiscale areas and to optimize geospatial zonation methods with potentially high degrees of spatial variability based on trial-and-error geostatistical assessments. In this study, a multi-source geospatial information framework, which included the construction of a big data platform, estimation of geostatistical density, optimization of the geostatistical interpolation method, assessment of seismic site effects, and determination of geospatial zonation for decision making, was established. Then, this framework was applied to the Seoul metropolitan area, South Korea. The GIS-based framework was established to develop the geospatial zonation of site-specific seismic site effects before considering the local characteristics of site effects dependent on topographic or geological conditions, based on a geospatial big-data platform in Seoul. The zonal conditions were composed of geo-layers, site effect parameters, and other multi-source geospatial maps for each administrative area, and infrastructure was determined based on the integration of the optimized geoprocessing framework.

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“…Geological attributes are often connected to shear wave velocity in view of limited number of observation sites (e.g. Wills and Silva, 1998;Wills and Clahan, 2006). On the basis of the overlapping ranges of V S,30 accorded to different geological units, Wills et al (2000) introduced intermediate classes namely BC, CD, and DE corresponding to an average V S,30 of 760 m/s, 360 m/s, and 180 m/s, respectively.…”

Section: Site Classificationmentioning

confidence: 99%

Seismic hazard assessment – a holistic microzonation approach

Nath

Thingbaijam

2009

Nat. Hazards Earth Syst. Sci.

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Abstract. The probable mitigation and management issues of seismic hazard necessitate seismic microzonation for hazard and risk assessment at the local level. Such studies are preceded with those at a regional level. A comprehensive framework, therefore, encompasses several phases from information compilations and data recording to analyses and interpretations. The state-of-the-art methodologies involve multi-disciplinary approaches namely geological, seismological, and geotechnical methods delivering multiple perspectives on the prevailing hazard in terms of geology and geomorphology, strong ground motion, site amplification, site classifications, soil liquefaction potential, landslide susceptibility, and predominant frequency. The composite hazard is assessed accounting for all the potential hazard attributing features with relative rankings in a logic tree, fuzzy set or hierarchical concept.

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Developing a Map of Geologically Defined Site-Condition Categories for California

Cited by 222 publications

References 15 publications

Shake Map Methodology for Intermediate-Depth Vrancea (Romania) Earthquakes

Shake Map Methodology for Intermediate-Depth Vrancea (Romania) Earthquakes

Geospatial Big Data-Based Geostatistical Zonation of Seismic Site Effects in Seoul Metropolitan Area

Seismic hazard assessment – a holistic microzonation approach

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