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The Mexican volcanic belt (MVB) is a seismogenic zone that transects thecentral part of Mexico with an east–west orientation. The seismic risk andhazard of this seismogenic zone has not been studied in detail due to thescarcity of instrumental data as well as because seismicity in thecontinental regime of central Mexico is not too frequent. However, it isknown that there are precedents of large earthquakes (<i>M</i><sub>w</sub> > 6.0)that have taken place in this zone. The valley of Mexico City (VM) is thesole zone, within the MVB, that has been studied in detail. Studies havemainly focused on the ground amplification during large events such as the1985 subduction earthquake that occurred off coast of Michoacán. Thepurpose of this article is to analyze the behavior of site effects in the MVBzone based on records of shallow earthquakes (data not reported before) thatoccurred in the zone between 1998 and 2011. We present a general overview ofsite effects in the MVB, a classification of the stations in order to reducethe uncertainty in the data when obtaining attenuation parameters in futureworks, as well as some comparisons between the information presented here andthat presented in previous studies.  A regional evaluation of site effects and Fourier acceleration spectrum(FAS) shape was estimated based on 80 records of 22 shallow earthquakeswithin the MVB zone. Data of 25 stations were analyzed. Site effects wereestimated by using the horizontal-to-vertical spectral ratio (HVSR)methodology. The results show that seismic waves are less amplified in thenortheast sites of the MVB with respect to the rest of the zone and that itis possible to classify two groups of stations: (1) stations with negligiblesite amplification (NSA) and (2) stations with significant site amplification(SSA). Most of the sites in the first group showed small (<3)amplifications while the second group showed amplifications ranging from 4to 6.5 at frequencies of about 0.35, 0.75, 15 and 23 Hz. With these groupsof stations, average levels of amplification were contrasted for the firsttime with those caused by the subduction zone earthquakes. With respect tothe FAS shapes, most of them showed similarities at similar epicentraldistances. Finally, some variations of site effects were found when comparedto those obtained in previous studies on different seismicity regions. Thesevariations were attributed to the location of the source.  These aspects help to advance the understanding about the amplificationbehavior and of the expected seismic risk on central Mexico due to largeearthquakes within the MVB seismogenic zone

natural hazards and earth system sciences

On the behavior of site effects in central Mexico (the Mexican volcanic belt – MVB), based on records of shallow earthquakes that occurred in the zone between 1998 and 2011