The antiresonance phenomena in seismic microzonation

DOI: 10.37153/2618-9283-2021-3-8-18

Authors:  
Rubric:     Seismic zoning   
Key words: antiresonance effect, inverse layer, technogenic and natural changes in the properties of the soil mass
Annotation:
The
interference of incident and reflected seismic waves in the ground massif near
the day surface is the cause of resonant effects. In the practice of seismic
microzonation (SMZ), a resonant increase in the total seismic intensity is of
particular importance. At the same time, the presence of inverse layers in the
ground layers interference leads to a decrease in the intensity of the total
seismic impact, what is naturally named antiresonance. The article considers
the conditions for the occurrence of antiresonance and evaluates the limits of
its effectiveness. The natural and man-made causes of antiresonance and the
possibility of using it to reduce the intensity of seismic impacts are
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