Late Quaternary history of paleoseismic activity along the Hohhot Segmentof the Daqingshan piedmont faultin Hetao depression zone, North China

The Daqingshan Piedmont Fault (DPF) is one of the major active normal faults in the Hetao depression zone in the
 northern part of Ordos Block, North China. It extends in NEE direction along the Daqingshan piedmont zone in the
 eastern part of the depression, dipping to the south, for a length of 223 km. The fault formed in the Eocene and underwent
 strong movement during the Cenozoic time. Its vertical displacement amplitude has exceeded 2400 m since the
 Quaternary. The fault can be divided into 5 active segments. Paleoseismological studies were concentrated on its
 western part from Baotou to Tumdzuoqi whereas the Hohhot Segment to the east was scarcely studied. To fill this gap
 of knowlegde, the authors carried out in-depth study on the Daqingshan piedmont fault during recent years. Excavation
 of trenches at Kuisu, Ulanblang, and Bakouzi sites on the Hohhot Segment of the Daqingshan piedmont fault
 and study of geomorphic surfaces allow us to identify and date paleoearthquakes and to evaluate the completeness of
 paleoseismic activity history. This was done both for the individual sites and for the entire segment since the Late
 Quaternary using the «method for displacement confining» along the fault and «method for correlation between multiple
 trenches». In this paper we present the geological loggings of two trenches at Kuisu site, provide the evidence
 for 6 events since 19 ka BP and the cumulative displacement amount produced by them is around 7 m. But the cumulative
 displacement amount obtained from difference in heights of geomorphic surfaces is 5.??.5.5 m. Results of tests
 using the method of displacement confining show that the event sequence revealed at this site can be considered complete.
 The data supplemented with information obtained in the Ulanblang and Bakouzi trenches show that 7 paleoseismic
 events occurred on the Hohhot Fault Segment since 19 ka BP, i.e. they occurred at 18.75 ± 0.75 ka, 16.97 ±
 ± 0.96 ka, 14.65 ± 0.67 ka, 11.82 ± 0.69 ka, 9.45 ± 0.26 ka, 6.83 ± 0.26 ka, and 4.50 ± 0.23 ka BP, respectively, and
 the average recurrence interval is 2.375 ± 0.432 ka. These results basically reflects the history of paleoseismic activity
 on the fault segment in this period of time.

Abstract licence: CC BY

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