scholarly journals Segmentation and termination of the surface rupture zone produced by the 1932 Ms 7.6 Changma earthquake: New insights into the slip partitioning of the eastern Altyn Tagh fault system

Lithosphere ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 19-39
Author(s):  
Jiaxin Du ◽  
Bihong Fu ◽  
Qiang Guo ◽  
Pilong Shi ◽  
Guoliang Xue ◽  
...  
Keyword(s):  
Slip Rate ◽  
Rupture Zone ◽  
Fault System ◽  
Surface Rupture ◽  
Altyn Tagh Fault ◽  
Slip Rates ◽  
Leading Role ◽  
Surface Rupture Zone ◽  
Altyn Tagh ◽  
Slip Partitioning

Abstract The 1932 Ms 7.6 earthquake struck the active Changma fault in the NE Tibetan Plateau, and produced a distinct surface rupture along the fault zone. However, the segmentation and termination of the surface rupture zone are still unclear. In this paper, the active tectonic analyses of multiple satellite images complemented by field investigations present the 120-km-long surface rupture zone, which can be divided into five discrete first-order segments, ranging from 14.4 to 39.56 km in length, linked by step-overs. Our results also indicate that the 1932 rupture zone could jump across step-overs 0.3–4.5 km long and 2.2–5.4 km wide in map view, but was terminated by a 6.3-km-wide restraining step-over at the eastern end. The left-lateral slip rates along the mid-eastern and easternmost segments of the Changma fault are 3.43 ± 0.5 mm/yr and 4.49 ± 0.5 mm/yr since 7–9 ka, respectively. The proposed tectonic models suggest that the slip rates on the Changma fault are similar to the slip rate on the eastern segment of the Altyn Tagh fault system near the junction point with the Changma fault. These results imply that the Changma fault plays a leading role in the slip partitioning of the easternmost segment of the Altyn Tagh fault system.

New constraints on Quaternary slip partitioning near the eastern termination of the Altyn Tagh Fault 

2021 ◽  
Author(s):  
Nimrod Wieler ◽  
Amit Mushkin ◽  
Eitan Shelef ◽  
Huiping Zhang ◽  
Amir Sagy ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Late Quaternary ◽  
Slip Rate ◽  
Alluvial Fan ◽  
Luminescence Dating ◽  
The Tibetan Plateau ◽  
Altyn Tagh Fault ◽  
Slip Rates ◽  
Altyn Tagh ◽  
Slip Partitioning

<p>Slip partitioning along the northern boundary of the Tibetan Plateau is essential for understanding regional deformation and the seismic potential of the different faults that accommodate it. Within this framework the Altyn Tagh Fault (ATF) is commonly viewed as the primary structure that separates the Tibetan Plateau from the stable Gobi-Alashan block to the north. Late Quaternary sinistral slip rates of 8-12 mm/yr across the central ATF between 86° and 93°E decrease eastwards to zero as the fault approaches its mid-continental termination at ~97°E. To better understand how late Quaternary slip is partitioned along the ATF’s eastern termination we obtained new slip-rate measurements  for the ~200-km-long left-lateral ENE striking Sanweishan Fault (SSF) located ~60 km north of the ATF between 94°-96°E near the town of Dunhuang.</p><p>Multiple sinistral offsets ranging up to 600 m were identified by linking the clast assemblage of offset alluvial fan remnants with their provenance upstream of the fault.  Luminescence dating revealed depositional ages ranging from 100 - 200 ka for the offset features and time-invariant minimum sinistral slip of 2.5±1 mm/yr during the last ~200 ka, which is approximately an order of magnitude higher than previously reported slip-rates for the SSF. Our results indicate that the SSF and the eastern segment of the ATF accommodate comparable magnitudes of late Quaternary slip. Considering this substantial transfer of lateral slip as far as 60 km north of the eastern ATF we propose that the SSF may represent juvenile northeastward expansion of the Tibetan Plateau into previously stable parts of the Gobi-Alashan block.</p>

Geodetic evidence for a low slip rate in the Altyn Tagh fault system

Nature ◽  
2000 ◽  
Vol 404 (6773) ◽  
pp. 69-72 ◽  
Author(s):  
Rebecca Bendick ◽  
Roger Bilham ◽  
Jeffrey Freymueller ◽  
Kristine Larson ◽  
Guanghua Yin
Keyword(s):  
Slip Rate ◽  
Fault System ◽  
Altyn Tagh Fault ◽  
Altyn Tagh

Structural analysis and tectonic evolution of the western domain of the Eastern Kunlun Range, northwest Tibet

2019 ◽  
Vol 132 (5-6) ◽  
pp. 1291-1315 ◽  
Author(s):  
Chen Wu ◽  
Changfeng Liu ◽  
Suoya Fan ◽  
Andrew V. Zuza ◽  
Lin Ding ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Fault System ◽  
Sediment Provenance ◽  
The Tibetan Plateau ◽  
Altyn Tagh Fault ◽  
Slip Rates ◽  
Tectonic Model ◽  
Relative Contribution ◽  
Field Evidence ◽  
Altyn Tagh

Abstract The Tibetan Plateau, the largest highland on Earth, formed due to the collision of India-Asia over the past 50–60 m.y., and the evolution of the Tibetan Plateau impacts our knowledge of continental tectonics. Examination of the northernmost margin of the Tibetan Plateau is key to unravelling the deformation mechanisms acting in northern Tibet. The left-slip Altyn Tagh fault system defines the northwest margin of the Tibetan Plateau, separating the Western and Eastern Kunlun Ranges in the southwest. Both Cenozoic and pre-Cenozoic crustal deformation events at this junction between the Altyn Tagh and Kunlun Ranges were responsible for the construction of northwestern Tibet, yet the relative contribution of each phase remains unconstrained. The western domain of the Eastern Kunlun Range is marked by active NE-trending, left-slip deformation of the Altyn Tagh fault and an E-striking Cenozoic thrust system developed in response India-Asia collision. To better constrain the Paleozoic Altyn Tagh and Kunlun orogens and establish the Cenozoic structural framework, we conducted an integrated investigation involving detailed geologic mapping (∼1:50,000 scale), U-Pb zircon geochronology, and synthesis of existing data sets across northwestern Tibet. Our new zircon analyses from Paleoproterozoic–Cretaceous strata constrain stratigraphic age and sediment provenance and highlight Proterozoic–Paleozoic arc activity. We propose a tectonic model for the Neoproterozoic–Mesozoic evolution of northwestern Tibet wherein restoration of an ∼56-km-long balanced cross section across the western domain of the Eastern Kunlun suggests that Cenozoic minimum shortening strain was ∼30% (∼24 km shortening). Field evidence suggests this shortening commenced after ca. 25–20 Ma, which yields an average long-term shortening rate of 1.2–0.9 mm yr–1 and strain rates of 4.7 × 10–16 s–1 to 2.3 × 10–16 s–1. Geometric considerations demonstrate that this contractional deformation did not significantly contribute to left-slip offset on the Altyn Tagh fault, which has ∼10 mm/yr slip rates.

The First Quantitative Slip-Rate Estimated Along the Ashikule Fault at the Western Segment of the Altyn Tagh Fault System

2015 ◽  
Vol 89 (6) ◽  
pp. 2088-2089 ◽  
Author(s):  
PAN Jiawei ◽  
LI Haibing ◽  
VAN DER WOERD Jerome ◽  
SUN Zhiming ◽  
SI Jialiang ◽  
...  
Keyword(s):  
Slip Rate ◽  
Fault System ◽  
Altyn Tagh Fault ◽  
Altyn Tagh ◽  
Western Segment

Is the North Altyn fault part of a strike-slip duplex along the Altyn Tagh fault system?

Geology ◽  
2000 ◽  
Vol 28 (3) ◽  
pp. 255 ◽  
Author(s):  
Eric Cowgill ◽  
An Yin ◽  
Wang Xiao Feng ◽  
Zhang Qing
Keyword(s):  
Strike Slip ◽  
Fault System ◽  
Altyn Tagh Fault ◽  
The North ◽  
Altyn Tagh

Detailed mapping of the surface rupture of the 12 February 2014 Yutian Ms7.3 earthquake, Altyn Tagh fault, Xinjiang, China

2020 ◽  
Author(s):  
Zhaode Yuan ◽  
Jing Liu-Zeng ◽  
Xue Li ◽  
Jing Xu ◽  
Wenqian Yao ◽  
...  
Keyword(s):  
Surface Rupture ◽  
Altyn Tagh Fault ◽  
Altyn Tagh

scholarly journals Soil gas distribution in the main coseismic surface rupture zone of the 1980, M s  = 6.9, Irpinia earthquake (southern Italy)

2014 ◽  
Vol 119 (3) ◽  
pp. 2440-2461 ◽  
Author(s):  
Giancarlo Ciotoli ◽  
Sabina Bigi ◽  
Chiara Tartarello ◽  
Pietro Sacco ◽  
Salvatore Lombardi ◽  
...  
Keyword(s):  
Southern Italy ◽  
Soil Gas ◽  
Rupture Zone ◽  
Gas Distribution ◽  
Surface Rupture ◽  
Surface Rupture Zone
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