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WITHDRAWN Determination of Seismic Intensities From Seismic Microzoning Results for the Xalapa Conurbation Zone, Veracruz, México

Description: 

WITHDRAWN The effects of earthquakes in México have caused great disasters, which are accompanied by economic and human losses;in the State of Veracruz, throughout its history, important damages have been manifested due to earthquakes of great intensity. The State occupies the second and third place in the number of fatalities at the national level, with the Xalapa earthquakes of 1920 and the Orizaba earthquake of 1973, only after the Mexico City earthquake of 1985.

The objective of this study was to create seismic intensity maps in terms of maximum accelerations for the metropolitan area of ​​Xalapa, using the results of environmental vibration studies in the area. The seismic records obtained from the non-permanent seismic monitoring network of the Veracruz University in the Xalapa area, and the results of the environmental vibration analysis obtained for more than 500 vibration points taken in the seismic microzonation of the metropolitan area were used.

A one-dimensional propagation methodology of the signal of the earthquakes recorded in the seismic monitoring stations of the metropolitan area was proposed, from the rock to the surface using a convolution operator, related to the empirical transfer function obtained from the seismic noise. This study used acceleration records from various stations, within the earthquake catalog of the seismic monitoring network, both to validate the methodology and to generate seismic scenarios for each of the earthquakes under study.

The maps were created for earthquakes of various magnitudes and seismogenic sources, to obtain maps of maximum amplification of the terrain in the metropolitan area, and thus establish areas of greater acceleration of the terrain and therefore of greater danger. The aforementioned methodology will be applied to obtain maps of the maximum accelerations in a practical and efficient way, which will serve to delimit the areas with the greatest danger, with which the population and decision makers, will be able to take immediate actions after the occurrence of an earthquake and orient them where to direct the aid after the earthquake.

Session: Understanding and Modeling the Uncertainties in Earthquake Ground Motions [Poster]

Type: Poster

Date: 4/20/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Gilbert Francisco Torres Morales

Student Presenter: No

Invited Presentation: 

Authors