NDLI: Using borehole core analysis to reveal Late Quaternary paleoearthquakes along the Nankou-Sunhe Fault, Beijing

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Using borehole core analysis to reveal Late Quaternary paleoearthquakes along the Nankou-Sunhe Fault, Beijing

Content Provider	Springer Nature Link
Author	Zhang, ShiMin Wang, DanDan Liu, XuDong Zhang, GuoHong Zhao, JunXiang Luo, MingHui Ren, JunJie Wang, Rui Zhang, YingLi
Copyright Year	2008
Abstract	The Nankou-Sunhe Fault is a buried active normal fault that traverses the urban area of Beijing. Its seismic risks have caused considerable concerns. This paper studies paleoearthquakes along this fault by analyzing and correlating bore-hole cores obtained from triple-tube coring, incorporating experience acquired from trenching. As a result, a model for identifying earthquake-derived colluvium by sediment-core analysis is proposed. Triple-tube coring technique is useful to collect continuous undisturbed soil core near the Nankou-Sunhe Fault. By identifying fault-scarp colluviums, determining cumulative displacement, and analysing stratum thickening on the hanging wall, we are able to establish a preliminary paleoearthquake sequence consisting of 13 surface-rupturing events since 60 ka. The seismic history can be divided into three periods based on different recurrence intervals. Between 60 and 40 ka, three earthquakes occurred with recurrence interval of ∼10 ka. From 40 to 25 ka, there were six earthquakes with the recurrence interval of about 2.5 ka. In the last 25 ka, four earthquakes have taken place with the recurrence interval varying considerably. The recurrence interval between the last three events is ∼5 ka. Smaller recurrence intervals correspond to stages of faster fault slip. The coseismic displacement of a single event is 0.8 to 2.2 m, average 1.4 m, largely equivalent to moment magnitudes 6.7–7.1. This study demonstrates the feasibility of bore-hole drilling in investigating paleoearthquakes along normal faults. It also suggests that closely spaced boreholes with continuous undisturbed cores are essential for reconstructing the complete paleoearthquake sequence.
Starting Page	1154
Ending Page	1168
Page Count	15
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	51
Issue Number	8
e-ISSN	18622801
Language	English
Publisher	SP Science in China Press
Publisher Date	2008-07-16
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	Nankou-Sunhe Fault bore-hole surveying triple-tube coring paleoearthquake colluvium Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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