Paleoseismic study of the east Kalpintage fault in southwest Tianshan based on deformation of alluvial fans and 10Be dating

Li, An; Ran, Yongkang; Xu, Lei; Liu, Huaguo

doi:10.1007/s11069-013-0675-1

Cited by 11 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two views are popular. The first view suggests that the left-lateral slip of the Haiyuan fault and the northern margin zone of the Qinling Mountains on the northeastern margin of the Tibetan Plateau have affected the formation and evolution of the basins in northern China since the late Cenozoic (Gaudemer et al, 1995;Li et al, 2013;Peltzer et al, 1985;Tapponnier et al, 1982Tapponnier et al, , 1986Wang et al, 2014;Zhang et al, 1999). This view considers the India-Eurasian collision to be the main driver of the formation and evolution of the basins in northern China since the late Cenozoic.…”

Section: Discussionmentioning

confidence: 99%

The vertical slip rate of the Sertengshan piedmont fault, Inner Mongolia, China

Zhang

et al. 2017

Journal of Asian Earth Sciences

View full text Add to dashboard Cite

The vertical slip rate of a normal fault is one of the most important parameters for evaluating its level of activity. The Sertengshan piedmont fault has been studied since the 1980s, but its absolute vertical slip rate has not been determined. In this paper, we calculate the displacements of the fault by measuring the heights of piedmont terraces on the footwall and the stratigraphic depths of marker strata in the hanging wall. We then calculate the vertical slip rate of the fault based on the displacements and ages of the marker strata. We selected nine sites uniformly along the fault to study the vertical slip rates of the fault. The results show that the elevations of terraces T3 and T1 are approximately 1060 m and 1043 m, respectively. The geological boreholes in the basin adjacent to the nine study sites reveal that the elevation of the bottom of the Holocene series is between 1017 and 1035 m and that the elevation of the top of the lacustrine strata is between 925 and 1009 m. The data from the terraces and boreholes also show that the top of the lacustrine strata is approximately 65 ka old. The vertical slip rates are calculated at 0.74-1.81 mm/a since 65 ka and 0.86-2.28 mm/a since the Holocene. The slip rate is the highest along the Wujiahe segment and is lower to the west and east. Based on the findings of a previous study on the fault system along the northern margin of the Hetao graben basin, the vertical slip rates of the Daqingshan and Langshan faults are higher than those of the Sertengshan and Wulashan faults, and the strikeslip rates of these four northern Hetao graben basin faults are low. These results agree with the vertical slip components of the principal stress field on the faults. The results of our analysis indicate that the Langshankou, Wujiahe, and Wubulangkou areas and the eastern end of the Sertengshan fault are at high risk of experiencing earthquakes in the future.

show abstract

Section: Discussionmentioning

confidence: 99%

The vertical slip rate of the Sertengshan piedmont fault, Inner Mongolia, China

Zhang

et al. 2017

Journal of Asian Earth Sciences

View full text Add to dashboard Cite

show abstract

“…Based on seismic reflection profile data combined with displacement or buckling deformation at the bottom of the sedimentary sequence, PQF is a steeply dipping basement fault (Tuner et al., 2011). Geological results indicate that there are different shortening rates in the western and eastern segments (2.5–2.7 and ∼0.3 mm/a, respectively, Li et al., 2013, 2020). The decrease in shortening rates is not gradual, but rather a sharp decrease from west to east at the PQF.…”

Section: Regionally Active Tectonic Frameworkmentioning

confidence: 99%

“…Although the Kepingtage FTB is thrusting southward, the Piqiang Fault (PQF), a NNW-trending left-lateral strike-slip fault divides it into eastern and western segments. Asymmetric five-and three-row anticlinal belts exist in the eastern and western PQF sections, respectively (Allen et al, 1999;Li et al, 2013Li et al, , 2020. Therefore, the PQF adjusted the deformation difference between the eastern and western segments.…”

mentioning

confidence: 99%

Present‐Day Strike‐Slip Faulting and Thrusting of the Kepingtage Fold‐and‐Thrust Belt in Southern Tianshan: Constraints From GPS Observations

Yao

et al. 2022

Geophysical Research Letters

View full text Add to dashboard Cite

Across inherited complex fold‐and‐thrust belts (FTBs), shortening may be accommodated at different rates depending on structural style variations; such cases have rarely been documented We present the example of the Kepingtage FTB in southern Tianshan, which is bisected by the NNW‐trending left‐lateral strike‐slip Piqiang Fault (PQF) into eastern and western segments. The 1.45 ± 0.31–2.10 ± 0.42 mm/a shortening rate of the eastern segment is accommodated in a diffuse‐deformation pattern within the five‐row thrust‐anticlinal zone and the 2.36 ± 0.23–3.70 ± 0.59 mm/a shortening rate of the western segment is accommodated within the two‐row thrust‐anticlinal zone at the FTB front. To accommodate the latitudinal variability, the PQF exhibits a 2.30 ± 0.20–4.10 ± 0.40 mm/a segmentation strike‐slip rate. The 2.35 ± 0.33–4.20 ± 0.45 mm/a shortening rate of the Kepingtage FTB and southern Tianshan Fault is one‐third of the total convergence rate between the Tarim Basin and Kazakh Platform at 77°–79°E; hence, the complex Tianshan deformation occurred mainly at the FTB.

show abstract

“…The ages of the terraces at Pishan have not been directly determined, but as the formation of terraces is likely to be climatically controlled, we can estimate a likely age range from terrace abandonment dates from elsewhere, provided that the two places have a similar climatic history over the relevant time period. Dating from aggradational terraces around the Tarim Basin and the Qilian Shan, 250–800 km distance from Pishan, has found ages from a few thousand years to >140 ka (e.g., Avouac & Peltzer, ; Li et al, , ; Mériaux et al, ; Saint‐Carlier et al, ) and slightly farther afield Stockmeyer et al () recently dated a suite of terraces on the northern front of the Tien Shan as 5–212 ka. Given that present‐day GPS velocities could allow no more than 3 mm/yr in the strike‐perpendicular direction (Ge et al, ) and that the oldest of the terraces (Tw10 and Tw9) are deformed vertically by at least 120 m (Figure ), it is likely that the oldest Pishan terraces are toward the older end of these age ranges.…”

Section: Folding In the Geomorphologymentioning

confidence: 99%

Blind Thrusting, Surface Folding, and the Development of Geological Structure in the M_w 6.3 2015 Pishan (China) Earthquake

et al. 2017

View full text Add to dashboard Cite

The relationship between individual earthquakes and the longer‐term growth of topography and of geological structures is not fully understood, but is key to our ability to make use of topographic and geological data sets in the contexts of seismic hazard and wider‐scale tectonics. Here we investigate those relationships at an active fold‐and‐thrust belt in the southwest Tarim Basin, Central Asia. We use seismic waveforms and interferometric synthetic aperture radar (InSAR) to determine the fault parameters and slip distribution of the 2015 Mw6.3 Pishan earthquake—a blind, reverse‐faulting event dipping toward the Tibetan Plateau. Our earthquake mechanism and location correspond closely to a fault mapped independently by seismic reflection, indicating that the earthquake was on a preexisting ramp fault over a depth range of ∼9–13 km. However, the geometry of folding in the overlying fluvial terraces cannot be fully explained by repeated coseismic slip in events such as the 2015 earthquake nor by the early postseismic motion shown in our interferograms; a key role in growth of the topography must be played by other mechanisms. The earthquake occurred at the Tarim‐Tibet boundary, with the unusually low dip of 21°. We use our source models from Pishan and a 2012 event to argue that the Tarim Basin crust deforms only by brittle failure on faults whose effective coefficient of friction is ≤0.05 ± 0.025. In contrast, most of the Tibetan crust undergoes ductile deformation, with a viscosity of order 1020–1022 Pa s. This contrast in rheologies provides an explanation for the low dip of the earthquake fault plane.

show abstract

Paleoseismic study of the east Kalpintage fault in southwest Tianshan based on deformation of alluvial fans and 10Be dating

Cited by 11 publications

References 10 publications

The vertical slip rate of the Sertengshan piedmont fault, Inner Mongolia, China

The vertical slip rate of the Sertengshan piedmont fault, Inner Mongolia, China

Present‐Day Strike‐Slip Faulting and Thrusting of the Kepingtage Fold‐and‐Thrust Belt in Southern Tianshan: Constraints From GPS Observations

Blind Thrusting, Surface Folding, and the Development of Geological Structure in the M_w 6.3 2015 Pishan (China) Earthquake

Contact Info

Product

Resources

About

Paleoseismic study of the east Kalpintage fault in southwest Tianshan based on deformation of alluvial fans and 10Be dating

Cited by 11 publications

References 10 publications

The vertical slip rate of the Sertengshan piedmont fault, Inner Mongolia, China

The vertical slip rate of the Sertengshan piedmont fault, Inner Mongolia, China

Present‐Day Strike‐Slip Faulting and Thrusting of the Kepingtage Fold‐and‐Thrust Belt in Southern Tianshan: Constraints From GPS Observations

Blind Thrusting, Surface Folding, and the Development of Geological Structure in the Mw 6.3 2015 Pishan (China) Earthquake

Contact Info

Product

Resources

About

Blind Thrusting, Surface Folding, and the Development of Geological Structure in the M_w 6.3 2015 Pishan (China) Earthquake