Abstract
Earthquake has left much life and property damages. The occurrence of such events necessitates the execution of plans for combating the earthquakes. One of the most important methods for combating earthquakes includes assessing dynamic characteristics of soil and site effect. One of the methods by which one can state dynamic characteristics of the soil of an area is the measurement of microtremors. Microtremors are small-scale vibrations that occur in the ground and have an amplitude range of about 0.1–1 microns. Microtremor measurement is fast, applicable, cost-effective. Microtremor measurements were taken at 15 stations in the Babol, north of Iran. Regarding H/V spectral ratio method, peak frequency and amplification factor were calculated for all microtremor stations. According to the analysis, the peak frequency varies from 0.67 to 8.10 Hz within the study area. Also, the authors investigated the validity of the results by comparing them with SESAME guidelines and geotechnical conditions of study area. The microtremor analysis results are consistent with SESAME guidelines and geotechnical condition of study area. The results show that the microtremor observations are acceptable methods for assessing dynamic characteristics of soil and site effect in the Babol City.
Highlights
Numerous observations in earthquake-affected areas have shown that the local intensity of earthquake shaking and the amount of structural damage due to seismic impact are in some way influenced by the local subsoil
In order to represent the spatial distribution of the peak frequency over the Babol City, interpolation between the microtremor stations was carried out
The authors evaluate the applicability of microtremor measurement in Babol City
Summary
Numerous observations in earthquake-affected areas have shown that the local intensity of earthquake shaking and the amount of structural damage due to seismic impact are in some way influenced by the local subsoil. The effect of local soil condition is known to have caused serious damage during several earthquakes. It is well accepted that, besides the earthquake magnitude and fault distance, local geological conditions, known as site effects, can impose significant influences on the earthquake ground motion at a given place (Rezaei et al 2015; Panzera et al 2013). Soft soil layers amplify the earthquake ground motion This fact increases the importance of assessing the site effects, in order to introduce suitable solutions for minimizing the earthquake damage and loss of life. These assessments are performed by different methods. This approach is being used as fast, applicable, cost-effective site effect assessment method
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