Geophysical Study and 3D Modeling of Site Effects in the Basin of Marga Marga, Viña Del Mar, Chile


Abstract eng:
The February 27, 2010 earthquake has induced damage to several buildings in the entire area of central Chile. Particularly in the Marga Marga basin, an anomalous concentration of structural damage was found in the downtown area of Viña del Mar city. Indeed, extensive damage was found in several medium-height buildings distributed along a narrow area of approximately 1 km in length. These observations suggest the existence of localized seismic amplification effects. A geophysical characterization using Surface-Waves based techniques and gravimetry was conducted to characterize the main dynamic properties of the soil and the depth of the basin. These data were complemented with several Standard Penetration Test (SPT) measurements to develop a 3D geotechnical characterization of the area. Based on this geotechnical description, a computational 3D model was developed to estimate possible site amplification effects explaining that concentration of structural damage. Initial results are in good agreement with damage observations and suggest an explanation related to basement shape.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 3853.:
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