Espectros de control para el Valle de los Chillos

Abstract

In order to quantify the seismic hazard for Chillos valley especially for the parishes Cotogchoa, Rumipamba, San Pedro de Taboada, Sangolquí and San Rafael, we have been obtained control spectra in terms of horizontal acceleration with 5% of damping, evaluated in soil types C and D according to the “Norma Ecuatoriana de la Contrucción 2015” (NEC-15). For this purpose, two scenarios seismic have been set product of Puengasi and Machachi faults, which due to the proximity to the study area could cause negative effects. Also, periods of recurrence have been found by Characteristic Earthquake model and Gutenberg Richter modified. The methodology used in obtaining these spectra has been by strong motion models as: Chiou and Youngs (2013), Campbell and Borzognia (2013) and Abrahamson et al. (2013), belonging to PEER (Pacific Earthquake Engineering Research Center's) and applicable for shallow crustal earthquakes. So, we have obtained an average spectrum based on the three models for each parish, considering the two possible seismic scenarios evaluated in two soil types, and it has been compared to the spectrum reported by the NEC-15.