Solving a direct problem as a new method of seismic microzonation
Solving a direct problem as a new method of seismic microzonation

Solving a direct problem as a new method of seismic microzonation

DOI: 10.37153/2618-9283-2021-2-38-53

Authors:  

Алешин Александр Степанович Aleshin A.S.
д-р физ.-мат. наук, зав. лаб. ИФЗ РАН

Vladimir V. Pogrebchenko
senior researcher. The Schmidt Institute of Physics of the Earth, The Russian Academy of Sciences (IPE RAS). Moscow, Russian Federation

Sergey N. Nikitin

research associate. The Schmidt Institute of Physics of the Earth, The Russian Academy of Sciences (IPE RAS). Moscow, Russian Federation


Key words: seismic microzonation, direct problem, seismic properties of soils, model, response spectrum, dynamic coefficient, average model, shear wave velocity, seismic rigidity
Annotation:

The article describes a new type of seismic microzonation, called the method of solving a direct problem. The main methodological technique in this case is the formation of  models of the soil layer on the basis of complex engineering-geological and geophysical studies. An original computer simulation technique based on the use of a short acceleration pulse as theinitial seismic impact is proposed. In the calculations of the increment of seismic intensity, a new formula is used that takes into account all the factors of the influence of soil properties on the parameters of seismic impacts – seismic rigidity, water saturation, resonant effects and the nonlinearity of the reaction of soils to strong seismic impacts. Based on the obtained data, the models of ground layers at the construction site are mapped and the parameters of seismic impacts that correspond to the properties of each model of ground massif are determined. The proposals presented in the article are reflected in the regulatory documents devoted to the SMZ of objects of increased responsibility and territorial planning

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