Abstract
The Trans-Mexican Volcanic Belt (TMVB), located in central Mexico, is an area for which low to moderate seismic risk is considered. This is based on the limited instrumental data available, even though large historical earthquakes have damaged some urban centers in the past. However, site effects is an aspect that must be considered in estimating risk, because there are some instances of important amplifications that have been documented with serious effects. In this work, ambient noise and earthquake records from 90 seismic permanent and temporary stations are used to analyze site response in the TMVB. The results obtained show a heterogeneous range in the value of the fundamental frequency. When possible, a comparison was made of the results obtained from ambient noise and earthquake records. In almost all these comparisons, no significant differences were observed in terms of the fundamental frequency. However, there were some stations with a flat average HVSR ambient noise curve that contradicted earthquake data results, which showed peaks at some frequencies. Our results are a first step towards categorizing the different site responses in the TMVB but in order to provide finer details, it is necessary to improve the actual monitoring conditions.
Highlights
Within the context of seismic engineering, the study of site response involves changes in variables related to the seismic intensity, in terms of amplitude, duration, and frequency content
Most of the average curves shown correspond to the Horizontalto-Vertical Spectral Ratio (HVSR) analyses based on ambient noise data, between 0.1 and 25 Hz
The results presented here only correspond to the analysis of ambient noise data
Summary
Within the context of seismic engineering, the study of site response involves changes in variables related to the seismic intensity, in terms of amplitude, duration, and frequency content. Lozano et al [18] studied the influence of source characteristics on the site effects in the Valley of Mexico from 36 interplate and inslab Mexican earthquakes and 12 teleseismic events originated in South America Their results agree with those obtained by [16] and concluded that observed site effects were independent of the characteristics and location of the source. Clemente-Chávez et al [19] presented the first study of site effects in the TMVB outside the Valley of Mexico, based on local shallow seismicity They analyzed HVSR curves obtained from 22 earthquakes recorded by 25 seismological stations located in the study zone. Average values for the fundamental frequency f0 and amplification factors obtained from the HVSR curves were reported Their results were compared with previous studies and they attributed the differences found to the location of the source. It is important to consider that a more accurate and reliable analysis can be carried out throughout microzonation studies, so our results only give a general overview
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