A method for estimating site vS30 based on geological attributes and topographic features
As a crucial parameter in earthquake engineering,the average shear wave velocity pla-ying a pivotal role in predicting the seismic performance and response characteristics of a specific site.This study introduces a comprehensive method for vS30 estimation,integrating geological at-tributes and diverse terrain factors.By utilizing drilling data,digital elevation model data,and 1∶250 000 geological map of Gansu Province,the proposed method undergoes a comparative vali-dation against conventional vS30 estimation methods.The results show that geological attributes and topographical features have a strong indication in the vS30 estimation of specific sites.Based on the division of geological units,the proposed estimation method of vS30 in Gansu Province was es-tablished by introducing four topographic factors,namely,topographic slope,surface texture,local convexity,and height above nearest drainage.In regions characterized by marked disparities in ge-ological attributes and terrain features,such as the Hexi Corridor and Loess Plateau,the estima-tion accuracy of the proposed method is higher than that of the traditional methods.The estima-tion results of vS30 obtained by the proposed method can provide a reference for determining the value of vS30 in Gansu Province,and also provide a new idea for estimating the value of vS30 in are-as with significant differences in geological attributes and topographic features.
site effectaverage shear wave velocityGansu ProvincevS30estimation method
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