Zoning Verification in Mexico City using strong motions of the M7.1 M7.1 Puebla-Morelos earthquake of September 19, 2017

Mehmet Celebi, Valerie J. Sahakian, Diego Melgar, & Luis Quintanar

Published July 25, 2018, SCEC Contribution #8200, 2018 SCEC Annual Meeting Poster #300

Spectral ratios computed from accelerations recorded by strong-motion stations in Mexico City during the mainshock of the September 19, 2017, M7.1 Puebla-Morelos earthquake reveal predominate periods consistent with those mapped in the 2004 Mexican Seismic Design Code. Furthermore, the predominant periods thus computed validate those studies using mainshock and aftershock recordings of the handful strong motion stations that recorded the 19 September 1985 M8.1 Michoacán earthquake. 2017 data from stations in Zones I, II and IIIa,b,c,d allow confirmation of site frequencies (periods) attributable to the specific zones (particularly those in Zone IIIa,b,c,d. Spectral ratios are computed from (1) ratio of smoothed amplitude spectra of a horizontal channel in direction X of a station w.r.t the horizontal channel in the same X direction of a reference stiff soil (or rock) station, and (2) H/V ratio (or also known as the Nakamura’s method), of both horizontal and vertical channels of the same station. Identified frequencies (periods) derived by both methods are in good agreement with those indicated in the zoning maps of Mexico City in the 2004 Seismic Design Code.

Key Words
Strong-motions, spectral ratio, zoning, site period,

Citation
Celebi, M., Sahakian, V. J., Melgar, D., & Quintanar, L. (2018, 07). Zoning Verification in Mexico City using strong motions of the M7.1 M7.1 Puebla-Morelos earthquake of September 19, 2017. Poster Presentation at 2018 SCEC Annual Meeting.

Related Projects & Working Groups
Earthquake Engineering Implementation Interface (EEII)