Abnormal Accelerating Stress Release Behavior on the Luhuo Segment of the Xianshuihe Fault, Southeastern Margin of the Tibetan Plateau, During the Past 3000 Years

Liang, Mingjian; Chen, Lichun; Ran, Yongkang; Li, Yanbao; Gao, Shuaipo; Han, Mingming; Lü, Lili

doi:10.3389/feart.2020.00274

Cited by 3 publications

(4 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, the Moxi fault displayed a slip rate of around 6–9.9 mm/year [ 14 ]. Incorporating the regional field survey data, trench excavation, and historical seismic analysis, Liang et al (2020) assessed a slip rate of 5 mm/year for the Zheduotang section and 8.4 mm/year for the Luhuo section, marking the inaugural determination of fault-zone activity variations over disparate periods [ 15 ]. From a geodesic perspective, Meng et al (2008) used a two-dimensional spiral dislocation model with GNSS data to deduce slip rates of 11.4 mm/year for the northwest section and 8.4 mm/year for the southeast section of the Xianshuihe fault [ 16 ].…”

Section: Regional Tectonic Backgroundmentioning

confidence: 99%

Research on the Surface Deformation, Fault Rupture, and Coseismic Geohazard of the 2022 Luding Mw 6.8 Earthquake

Lu,

Yang,

Zeng

et al. 2023

Sensors

View full text Add to dashboard Cite

An Mw 6.8 earthquake occurred in Luding County, Ganzi Tibetan Autonomous Prefecture, Sichuan Province, on 5 September 2022. This seismic event triggered numerous coseismic geohazards in the seismic zone. In this study, the ascending- and descending-track synthetic aperture radar (SAR) images observed by the Sentinel-1A satellite are utilized to extract the coseismic surface deformation of the Luding earthquake. Subsequently, a faulting model is estimated based on the elastic dislocation theory, under the constraint of the InSAR observation. Additionally, the POT technique was employed to detect coseismic geohazards. High-spatial-resolution optical remote sensing images served to validate the reliability of the detection results. The coseismic interferometric synthetic aperture radar (InSAR) deformation field indicated a maximum deformation of ~190 mm and ~140 mm along the ascending and descending tracks, respectively. The estimated best-fitting faulting model suggests that the optimal seismogenic fault strike and dip angles are 169.3° and 70°, respectively. The fault slip predominantly exhibits left-lateral strike-slip characteristics and is concentrated at depths of 3–12 km. The estimated maximum fault slip was 2.67 m, occurring at a depth of 7 km. The pixel offset tracking (POT) result derived from the pre- and post-earthquake SAR images found a total of 245 medium- to large-scale coseismic geohazards, with a verification rate from optical images exceeding 64%. The distribution of these geohazards is notably dense within the significant fault rupture segment. Geohazards on the fault hanging wall are densely packed, whereas landslides along the Dadu River’s fault footwall are also notably frequent.

show abstract

Section: Regional Tectonic Backgroundmentioning

confidence: 99%

Research on the Surface Deformation, Fault Rupture, and Coseismic Geohazard of the 2022 Luding Mw 6.8 Earthquake

Lu,

Yang,

Zeng

et al. 2023

Sensors

View full text Add to dashboard Cite

show abstract

“…The left-lateral strike-slip XF, located along the northern boundary of the CDB, is seismically highly active, where more than ten large earthquakes (Ms ≥ 6.9) occurred in recorded history (Allen et al, 1991;Wen et al, 2008). Based on multiple measurements, the strike-slip rate of the fault has been estimated to be ~2.5-5.6 mm/ yr (Li et al, 2017;Liang, 2019;Liang et al, 2020b;Gao, 2021). Previous trench excavations have revealed that several paleoearthquakes have occurred since the Holocene, specifically, five events in the Qianning segment over the past ~9,000 yr (Li et al, 2017), six events in the Luhuo segment over the past ~3,000 yr (Liang et al, 2020b).…”

Section: Regional Seismotectonic Settingmentioning

confidence: 99%

“…Based on multiple measurements, the strike-slip rate of the fault has been estimated to be ~2.5-5.6 mm/ yr (Li et al, 2017;Liang, 2019;Liang et al, 2020b;Gao, 2021). Previous trench excavations have revealed that several paleoearthquakes have occurred since the Holocene, specifically, five events in the Qianning segment over the past ~9,000 yr (Li et al, 2017), six events in the Luhuo segment over the past ~3,000 yr (Liang et al, 2020b). The seismic sequences of the Luhuo and Qianning segments are consistent with clustering and abnormal accelerating stress release behavior patterns (Li et al, 2017;Liang et al, 2020b).…”

Section: Regional Seismotectonic Settingmentioning

confidence: 99%

“…Previous trench excavations have revealed that several paleoearthquakes have occurred since the Holocene, specifically, five events in the Qianning segment over the past ~9,000 yr (Li et al, 2017), six events in the Luhuo segment over the past ~3,000 yr (Liang et al, 2020b). The seismic sequences of the Luhuo and Qianning segments are consistent with clustering and abnormal accelerating stress release behavior patterns (Li et al, 2017;Liang et al, 2020b). The recent research data based on faulted landforms, paleoseismic trenches and GPS data reveal that the JLF is generally a Holocene active fault with dextral strike-slip and thrust component Zhang et al, 2021).…”

Section: Regional Seismotectonic Settingmentioning

confidence: 99%

See 1 more Smart Citation

Paleoearthquakes of the Yangda-Yaxu fault across the Nujiang suture and Lancang river suture zone, southeastern Tibetan Plateau

Han¹,

Chen²,

Li³

et al. 2022

Front. Earth Sci.

Self Cite

View full text Add to dashboard Cite

The WNW-trending Yangda-Yaxu fault (YYF) is located in the interior of the Qiangtang block (QTB). The YYF cuts through the Nujiang suture and Lancang river suture zone and divides Nujiang fault (NF) and Lancangjiang fault (LCJF) into two sections with significantly different activity levels, suggesting that the YYF may function as a specific structure in this region. In addition, a recent work argues that the YYF plays an important role in strain partitioning in southeastern Tibet and poses a high surface-faulting risk to the Sichuan-Tibet railway. However, no M ≥ 5.0 earthquakes have been recorded, and no palaeoseismic research has been conducted along the fault, leading to limited knowledge regarding its rupture behavior, which is essential for understanding regional tectonic deformation and assessing the regional seismic potential. In this study, we constrained the timings and recurrence intervals of late Quaternary paleoseismic events along the YYF for the first time. Through trench excavations and exposure cleaning combined with radiocarbon dating, five faulting events were identified, namely, E1 through E5 from youngest to oldest (831–1,220, 3,307–6,703, 9,361–10,286, 12,729–14,651, and before 14,651 yr BP). The recurrence interval of major earthquakes along the YYF follows a quasi-periodic pattern with an interval of ∼4,000 yr. Combining the clear linear geomorphic features along the fault and the paleoearthquake results in this paper, we believe that YYF is a newly-generated active fault, and has a significant control effect on the late Quaternary evolution of the NF and the LCJF. Further analysis revealed that the YYF also plays an important role in accommodating crustal deformation.

show abstract

Spatial Variations of Late Quaternary Slip Rates along the Ganzi–Xianshuihe Fault Zone in the Eastern Tibet

Sun,

Li,

Liang

et al. 2024

Remote Sensing

View full text Add to dashboard Cite

The Ganzi–Xianshuihe Fault Zone is a large-scale sinistral strike-slip fault zone on the eastern Tibet. As the boundary fault zone of the Bayankala Block and the Chuandian Block, it controls the clockwise rotation of the southeastern Tibet. However, there is still controversy regarding the activity changes between fault zones. Therefore, accurately determining the slip rates of faults in the area is crucial for characterizing regional plate motions and assessing associated seismic hazards. We focused on studying four fault segments near the Ganzi–Xianshuihe Fault Zone, including the Manigango, Ganzi, Luhuo, and Daofu segments. In each segment, we selected typical sinistral piercing points and carried out Unmanned Aerial Vehicle (UAV) photogrammetry to obtain high-resolution terrain data. We utilized LaDiCaoz_V2.2 and GlobalMapper software (LaDiCaoz_V2.2 and Global Mapper v17.0) to measure the offsets, together with optically stimulated luminescence (OSL) dating, to constrain the timing of fault activity. The estimated slip rates for the Manigango, Ganzi, Luhuo, and Daofu segments are as follows: 9.2 ± 0.75 mm/yr, 9.59 ± 1.7 mm/yr, 4.23 ± 0.66 mm/yr, and 7.69 ± 0.76 mm/yr, respectively. Integrating previous results with slip rates estimated in this study, our analysis suggests the slip rate of the Ganzi–Xianshuihe Fault Zone is around 8–10 mm/year, exhibiting a consistent slip rate from northwest to southeast. This reflects the overall coordination of the movement on the eastern Tibet, with the strike-slip fault zone only controlling the direction of movement.

show abstract

Abnormal Accelerating Stress Release Behavior on the Luhuo Segment of the Xianshuihe Fault, Southeastern Margin of the Tibetan Plateau, During the Past 3000 Years

Cited by 3 publications

References 34 publications

Research on the Surface Deformation, Fault Rupture, and Coseismic Geohazard of the 2022 Luding Mw 6.8 Earthquake

Research on the Surface Deformation, Fault Rupture, and Coseismic Geohazard of the 2022 Luding Mw 6.8 Earthquake

Paleoearthquakes of the Yangda-Yaxu fault across the Nujiang suture and Lancang river suture zone, southeastern Tibetan Plateau

Spatial Variations of Late Quaternary Slip Rates along the Ganzi–Xianshuihe Fault Zone in the Eastern Tibet

Contact Info

Product

Resources

About