[S03-4] Imaging of heterogeneities in the Earth with seismic scattered waves and ambient noise IV

[S03-4-04] HV Spectral Ratio (HVSR) for preliminary seismic characterization of Sun Pyramid in Teotihuacan, Mexico

Jose Pina-Flores^{1, 2}, Shinichi Matsushima³, ^○Francisco J Sanchez-Sesma¹, Juan C Molina-Villegas⁴, Jesus Morales-Valdez¹, Mario A Saenz-Castillo⁵, Cesar A Sierra-Alvarez⁵, Hiroshi Kawase³ (1.Instituto de Ingenieria, Universidad Nacional Autonoma de Mexico, Mexico, 2.Facultad de Ingenieria, Universidad Nacional Autonoma de Mexico, Mexico, 3.Disaster Prevention Research Institute, Kyoto University, Uji, Japan, 4.Facultad de Ingenieria,Universidad de Medellin, Colombia, 5.EAFIT University of Medellin, Colombia)

Currently Teotihuacan is one of the most important archaeological sites in Mexico and it is the most representative city of the classic period in the central Mexican anti-plane. In the center of Teotihuacan two monumental structures stand out: The Moon and the Sun pyramids. The latter is the largest structure. With the purpose of knowing its seismic characteristics and constructive processes of the Sun Pyramid, we carried out a campaign of environmental seismic noise measurements with 16 sensors distributed in the different locations and levels of the pyramid. In this work we show some preliminary results of the HV Spectral Ratios (HVSRs) which show a clear effect of amplification in different frequencies for the different levels produced by the existence of irregular geometry. Also, we will focus on the directionality of HVSRs in order to understand the topological effect and the heterogeneity within the pyramid.