Relative tectonic activity of the Sertengshan piedmont fault based on geomorphic parameters
The Sertengshan piedmont fault was active in the Holocene.Recent studies have mainly explored the paleoearthquakes and the slip rate in different segments.This paper extracted the river geomorphic parameters in the Sertengshan piedmont fault area,thus obtaining the longitu-dinal profile,hypsometric integral(HI),and normalized channel steepness index of 28 rivers.Results indicate that the longitudinal profiles of most rivers are well-fitted by an exponential function,indicating that most of the basins are in their prime years.The HI values range from 0.35 to 0.66,in which 12 basins are in the juvenile stage with HI greater than 0.5,and 16 basins are in the prime stage with HI in the range of 0.3-0.5.The precipitation and lithology reveal limited influence on the steepness index,while the steepness index is principally affected by the tectonic uplift rate.Along the fault zone,high values of the steepness index in each channel show an increasing-decreasing-increasing-decreasing-slowing trend.Overall,the tectonic movement of the Sertengshan piedmont fault zone is relatively active,with the western and central parts being more active than the eastern part.Furthermore,the tectonic activity in the western part of the fault zone and the transition of fault strike is strong,which is almost consistent with the distribu-tion characteristics of structural activities presented in previous studies.
geomorphic parametersSertengshan piedmont faultfluvial longitudinal profilechannel steepness indexhypsometric integral
万方数据
维普
