Holocene paleoearthquakes of the Daqingshan fault detected from   knickpoint identification and alluvial soil profile

doi:10.1016/j.jseaes.2014.11.025

CORC > 北京大学 > 地球与空间科学学院

	Holocene paleoearthquakes of the Daqingshan fault detected from knickpoint identification and alluvial soil profile
	He, Zhongtai ; Ma, Baoqi
刊名	journal of asian earth sciences
	2015
关键词	IRS-P5 River gullies Knickpoints Alluvial fans Paleosol Paleoearthquake SAN-ANDREAS FAULT SOUTHERN-CALIFORNIA PALLETT CREEK EARTHQUAKES RIVERS
DOI	10.1016/j.jseaes.2014.11.025
英文摘要	Are there any effective methods to reveal paleoearthquakes on normal faults except traditional trenching technique? In this paper, we study Holocene paleoearthquakes of the Daqingshan fault which is a normal fault along the Daqingshan piedmont of Inner Mongolia in China. We identify knickpoints from stream profiles and study alluvial soil profiles to reconstruct the Holocene paleoearthquakes of the fault. From the fault's footwall we extract 25 gullies from IRS-P5 DEM data, and identify knickpoints in the profile that result from fault motion disturbing each channel. We combine the retreat distances and the knickpoint retreat rates to determine each knickpoint's forming time. We study alluvial fan outcrops that contain various paleosol sequences. As three distinct Holocene paleosols developed in the Daqingshan piedmont alluvial fans, we assume that the soil profile development was interrupted by fault activity preserved by interbedded gravel between the paleosols. The gravel layer between two adjacent paleosol layers represents material transported there after a paleoseismic event. Thus we date paleosol layers which are above and below the gravel layer to constrain paleoseismic events. Since trenches had been made by our predecessors along the fault to reveal the Holocene paleoearthquakes, we identify the Holocene paleoearthquake records from both sides of the fault, and then compare the results with the results from the trenches. The final result demonstrates that the knickpoints' sequence in the footwall and the paleosols' ages in the hanging wall correspond very closely with the Holocene paleoearthquakes along the Daqingshan piedmont fault. Methods in this paper have future application value to study paleoearthquakes on other normal faults with similar structure to the Daqingshan fault. (C) 2014 Elsevier Ltd. All rights reserved.; Geosciences, Multidisciplinary; SCI(E); 0; ARTICLE; hezhongtai@126.com; 261-271; 98
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155323]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	He, Zhongtai,Ma, Baoqi. Holocene paleoearthquakes of the Daqingshan fault detected from knickpoint identification and alluvial soil profile[J]. journal of asian earth sciences,2015.
APA	He, Zhongtai,&Ma, Baoqi.(2015).Holocene paleoearthquakes of the Daqingshan fault detected from knickpoint identification and alluvial soil profile.journal of asian earth sciences.
MLA	He, Zhongtai,et al."Holocene paleoearthquakes of the Daqingshan fault detected from knickpoint identification and alluvial soil profile".journal of asian earth sciences (2015).