Surface Slip Distribution and Earthquake Rupture Model of the Fuyun Fault, China, Based on High-Resolution Topographic Data

Liang, Zihan; Wei, Zhenyu; Sun, Huiping; Zhuang, Qitian; Zielke, Olaf

doi:10.2113/2021/7913554

Cited by 8 publications

(3 citation statements)

References 48 publications

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“…Although research on late Quaternary faulting and fault slip‐rate has been ongoing for 40 yr (e.g., Kirby et al., 2007; Klinger et al., 2011; Lasserre et al., 1999; Tapponnier et al., 1981; P. Z. Zhang et al., 1988), the relatively recent development of new techniques enabling easy acquisition of high‐resolution geomorphic data (e.g., unmanned aerial vehicle or UAV, LiDAR) now improves by orders of magnitude the precision of surface offset measurements (e.g., Liang et al., 2021; Yao et al., 2019). The most prominent fault along the dextral KJfz is the ∼230 km long Beng Co fault (BCF), source of the 1951, Mw 7.7 Beng Co earthquake, largest instrumentally recorded event within southern Tibet north of the Yarlung‐Zangbo suture (YZS, Figure 1a).…”

Section: Introductionmentioning

confidence: 99%

Holocene Slip Rate Along the Beng Co Fault and Dextral Strike‐Slip Extrusion of Central Eastern Tibet

Xu²,

Ren³

et al. 2022

Tectonics

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The dearth of quantitative studies of Holocene fault slip‐rates makes kinematic modeling of crustal deformation across SE Tibet debatable. The ∼230 km long, WNW‐striking, dextral Beng Co fault (BCF) is the most prominent strike‐slip fault of southern Tibet. Using new UAV topographic data and OSL/14C dating of geomorphic markers, we measure horizontal offsets and ages of fluvial terraces/fans and lacustrine shorelines at eight sites west and east of the Beng Lake pull‐apart. Along the eastern BCF's northern branch, our measurements at two different locations are consistent with offsets of ∼4.7 ± 1.1 and ∼8.7 ± 0.7 m during the past ∼3.1–3.6 and 3.6–5.2 ka, respectively. Along the southern branch, ∼25 ± 5 m of slip have accrued since ∼9 ka. The total Holocene slip‐rate across both faults (4.2–5.4 or 4.8 ± 0.5 mm/yr), consistent with GPS/InSAR values, implies that the BCF contributes significantly to the eastward extrusion of eastern‐central Tibet. This rate is slightly larger than the lower bound of the extension rate (∼6 ± 1.8 mm/yr) recently determined across the middle Gulu rift normal fault, which splays off southwards from the southeastern tip of the BCF's southern branch. Empirical relationships suggest that the reported ∼90 km length of the Mw 7.7, 1951 Beng Co earthquake surface rupture is too short, which implies that the eastern BCF is immature, or requires additional, partly deep slip, along other branches of the eastern BCF. That there is no field evidence of rupturing along the western BCF in the last ∼1,000 yr indicates that the Bange County area, west of Beng Co, may be at risk of an Mw ≈ 7.4? event.

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Section: Introductionmentioning

confidence: 99%

Holocene Slip Rate Along the Beng Co Fault and Dextral Strike‐Slip Extrusion of Central Eastern Tibet

Xu²,

Ren³

et al. 2022

Tectonics

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“…Additionally, a Digital Elevation Model (DEM) is generated, which is a type of digital terrain model that uses numerical values to simulate the ground terrain based on limited elevation data. [44,45] The aerial data were collected using the CW-15 fixed-wing unmanned aerial vehicle (Figure 4), manufactured by Chengdu Zongheng, equipped with a fixed-focus digital camera. The data collection period spanned from 10 to 12 January 2022.…”

Section: Data Acquisition and Processmentioning

confidence: 99%

Typical Fine Structure and Seismogenic Mechanism Analysis of the Surface Rupture of the 2022 Menyuan Mw 6.7 Earthquake

Wen,

Yuan,

Xie

et al. 2023

Remote Sensing

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On 8 January 2022, a seismic event of significant magnitude (Mw 6.7, Ms 6.9) occurred in the northeastern region of the Tibetan Plateau. This earthquake was characterized by left-lateral strike-slip motion, accompanied by a minor reverse movement. The Menyuan earthquake resulted in the formation of two main ruptures and one secondary rupture. These ruptures were marked by a left-lateral step zone that extended over a distance of 1 km between the main ruptures. The length of the rupture zones was approximately 37 km. The surface rupture zone exhibited various features, including left-lateral offset small gullies, riverbeds, wire fences, road subgrades, mole tracks, cracks, and scarps. Through a comprehensive field investigation and precise measurement using unmanned aerial vehicle (UAV) imagery, 111 coseismic horizontal offsets were determined, with the maximum offset recorded at 2.6 ± 0.3 m. The analysis of aftershocks and the findings from the field investigation led to the conclusion that the earthquake was triggered by the Lenglongling fault and the Tuolaishan fault. These faults intersected at a release double-curved structure, commonly referred to as a stepover. During this particular process, the Lenglongling fault was responsible for initiating the coseismic rupture of the Sunan–Qilian fault. It is important to note that the stress applied to the Tuolaishan fault has not been fully relieved, indicating the presence of potential future hazards.

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“…They found the previously reported maximum displacement of the 1920 earthquake might be the result of at least two earthquakes, which challenged our understanding of the Haiyuan Fault's characteristic (Ren et al, 2015). And the approach has been applied on other large faults in China, such as the Altyn Tagh Fault (Ren et al, 2015), the Fuyun fault (Liang et al, 2021), the Tianjingshan fault (Li et al, 2017), and the Xianshuihe fault (Ma et al, 2022).…”

Section: Cumulative Displacement Measurementsmentioning

confidence: 99%

Review on the Application of Airborne LiDAR in Active Tectonics of China: Dushanzi Reverse Fault in the Northern Tian Shan

Wei

Sun

2022

Front. Earth Sci.

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High-resolution topographic data are fundamental for active tectonics studies. Within the last 2 decades, the airborne light detection and ranging (LiDAR) system provided a solution for the accurate and efficient acquisition of detailed geomorphic features. The use of LiDAR data for the identification of microstructural and geomorphic features, fault zone activity analysis, and earthquake disaster assessment remains challenging and has been the focus of active tectonics studies. Based on the LiDAR data of Dushanzi anticline–a reverse fault zone in Xinjiang, China, our group carried out a significant number of active tectonic research studies. By reviewing the specific content of these works, we summarized the main application of LiDAR for a specific structure, the Dushanzi Reverse Fault in the northern Tianshan. In addition, other applications of LiDAR in active tectonics are summarized in this paper. These studies show that high-resolution LiDAR data facilitate detailed studies of the fault activity and paleoseismicity. We hope more researchers can realize the advantages of LiDAR technology in active tectonics research and apply LiDAR technology into their own practical work, so as to promote the development of active tectonics research.

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Surface Slip Distribution and Earthquake Rupture Model of the Fuyun Fault, China, Based on High-Resolution Topographic Data

Cited by 8 publications

References 48 publications

Holocene Slip Rate Along the Beng Co Fault and Dextral Strike‐Slip Extrusion of Central Eastern Tibet

Holocene Slip Rate Along the Beng Co Fault and Dextral Strike‐Slip Extrusion of Central Eastern Tibet

Typical Fine Structure and Seismogenic Mechanism Analysis of the Surface Rupture of the 2022 Menyuan Mw 6.7 Earthquake

Review on the Application of Airborne LiDAR in Active Tectonics of China: Dushanzi Reverse Fault in the Northern Tian Shan

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