Special Session: The 8th September Mw8.2 Tehuantepec and 19th September Mw7.1 Puebla-Morelos, Mexico Earthquakes: Reconnaissance Findings and Impact on Urban Areas in South-central Mexico
Type: Oral
Day: 5/17/2018
Time: 4:30 PM
Room: Brickell
Abstract
Mexico City was built on an islet of the former lake Texcoco. As a consequence of the gradual growth of Mexico's capital, replacing the water body, the city experiences some of the most outstanding site effects worldwide, including the long duration and large amplification of seismic waves. To explain the city's anomalous ground motion, we constructed a basin structure and studied the ground motion using recorded and simulated ground motions. The 3D velocity model of Mexico's capital (CDMX-E3D) presented here is based on an ongoing array deployment and geotechnical information. The velocity model is more detailed in the Xochimilco sub-basin, home of more than 1.5 million people, where several collapses and damages were reported during the September 19th earthquake. We used noise recordings of 20 moving arrays of 18 broadband seismometers deployed for five days with interstation distance ~500 m. With this data, we estimated the shallow crustal structure of the Xochimilco sub-basin employing ambient noise tomography. Using the newly developed model we carried out low-frequency (f<1.25 Hz) finite-element ground motion simulations of the September 19th earthquake. These simulations show great amplification in the Xochimilco region as well as a belt region in the northwestern area of the city, where damage is prevalent in large magnitude earthquakes. This Project was funded by the Secretaria de Ciencia, Tecnología e Innovación (SECITI) of Mexico City. Project SECITI/073/2016.
Author(s):
Rabade S. Universidad Nacional Autonoma de Mexico
Baena-Rivera M. Universidad Nacional Autonoma de Mexico
Contreras M. Universidad Nacional Autonoma de Mexico
Ramírez-Guzmán L. Universidad Nacional Autonoma de Mexico
Aguirre-Gonzalez J. Universidad Nacional Autonoma de Mexico
Ayala-Hernández M. Universidad Nacional Autonoma de Mexico
Macias-Castillo M. A. Universidad Nacional Autonoma de Mexico
Aguilar-Calderón L.A. Universidad Nacional Autonoma de Mexico
Almora-Mata D. Universidad Nacional Autonoma de Mexico
Castro-Parra G. Universidad Nacional Autonoma de Mexico
Delgado-Diance R. Universidad Nacional Autonoma de Mexico (UNAM)
Leonardo-Suárez M. Universidad Nacional Autonoma de Mexico
Molina Avila I. Universidad Nacional Autonoma de Mexico
Perez-Yañez C. Universidad Nacional Autonoma de Mexico (UNAM)
Ruiz-Gordillo A. L. Universidad Nacional Autonoma de Mexico
Sandoval-Gomez H. Universidad Nacional Autonoma de Mexico (UNAM)
Torres-Noguez M. Universidad Nacional Autonoma de Mexico
Velasco-Miranda J. M. Universidad Nacional Autonoma de Mexico
Alcántara-Nolasco L. Universidad Nacional Autonoma de Mexico (UNAM)
Vázquez-Larquet R. Universidad Nacional Autonoma de Mexico (UNAM)
Mora-Contreras A. Universidad Nacional Autonoma de Mexico
3-D Velocity Structure of the Mexico City Basin and Ground Motion Simulation of the 7.1 19 September 2017 Earthquake
Category
The 8th September Mw8.2 Tehuantepec and 19th September Mw7.1 Puebla-Morelos, Mexico Earthquakes: Reconnaissance Findings and Impact on Urban Areas in South-central Mexico