SITE EFFECTS IN MEXICO-CITY URBAN ZONE - A COMPLEMENTARY STUDY

Site effects are a major factor affecting seismic risk at Mexico City conurbation and have been carefully studied. However, most of the stud ies and instrumentation concentrate in Mexico City. We present an eval uation of site effects in the counties of Estado de Mexico, to the Nor th of Mexico City, that have been incorporated into Mexico City conurb ation. We measured microtremors at 67 points and operated a temporal d igital seismograph network. Our results allow us to extend the dominan t period map of Mexico City to the heavily populated and industrialize d counties of Estado de Mexico. Additionally, we propose a map of maxi mum relative amplification. Both maps are consistent with local geolog y, and could be useful for microzonation of this region.