Genesis and evolution of the mass transport deposits in the middle segment of the Pearl River canyon, South China Sea: Insights from 3D seismic data

Wang, Xingxing; Wang, Yingmin; He, Manchao; Chen, Weitao; Zhuo, Haiteng; Gao, Shengmei; Wang, Minghan; Zhou, Jiawei

doi:10.1016/j.marpetgeo.2017.08.036

Cited by 32 publications

(18 citation statements)

References 61 publications

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“…The deposits finally spread as a fan‐shaped planform at about 2 hr after the slide release as shown in Figure . The simulated slide motions of these synthetic scenarios well match the geophysical observations interpreted in previous studies (W. Li, Wu, Völker, et al, ; Sun, Cartwright, et al, ; Wang et al, ; Wang et al, ). For the most credible scenario (Slide 5), the key features of residual sediments, including the shape of runout as well as spatial thickness distributions on the slope and in the ocean basin, well‐capture those identified by Sun, Cartwright, et al () through high‐resolution seismic data.…”

Section: Resultssupporting

confidence: 84%

“…The bottom slide layer is coupled kinematically and dynamically to the upper water layer during the simulation. The sediments in the Baiyun Slide zone are dominated by organic‐rich fine‐grained sediments (sand/silt and mud; Sun, Cartwright, et al, ; Wang et al, ), which justifies the usage of the mudflow module in NHWAVE. The kinematic viscosity is set to be 0.1 m 2 /s and the Manning coefficient for the viscous slide is n = 0.05 s 2 /m 2/3 .…”

Section: Tsunami Modeling Approachmentioning

confidence: 99%

“…In this study, we intend to investigate the tsunamigenic potential of the Baiyun slide complex (named after (W. Li, Wu, Wang, et al, 2014)), which is one of the most well-studied landslides by marine geologists in the SCS (Figure 1). The geomorphology, internal structure, and spatial distribution of the Baiyun slide complex as well as the kinematics of slope failure have been studied using high-resolution 2-D/3-D seismic data, multibeam bathymetric data, and sediment cores (W. Li, Wu, Völker, et al, 2014;Sun, Alves, et al, 2018;Sun, Cartwright, et al, 2018;Sun et al, 2017;Sun et al, 2008;Wang et al, 2014;Wang et al, 2017;Wu et al, 2011). These studies provide valuable information of the key landslide features (i.e., initial water depth, slide thickness distribution, volume, etc.…”

Section: Introductionmentioning

confidence: 99%

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Tsunamigenic Potential of the Baiyun Slide Complex in the South China Sea

Shi

et al. 2019

JGR Solid Earth

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The Baiyun slide complex contains geological evidence for some of the largest landslide ever discovered in the continental slopes of the South China Sea. High‐resolution seismic data suggest that a variety of landslides with varied scales have occurred repeatedly in this area. The largest landslide reconstructed from bathymetric and seismic data has an estimated spatial coverage of ~5,500 km2 and a conservative volume of ~1,035 km3. Here, using geomorphological and geotechnical data, we construct a series of probable landslide scenarios and assess their tsunamigenic capacity. By treating the slides as deformable mudflows, we simulate the dynamics of landslide movements. The simulated landslide motions match the geophysical observations interpreted in previous studies. Particularly, we are able to reproduce the spatial distribution of observed runout, including the distance, shape, and deposit thickness, for the most credible slide scenario. We investigate tsunami impacts generated by different slide scenarios and highlight the importance of initial water depth, sliding direction, and nearshore bathymetry. The worst‐case scenario is capable of producing basin‐wide tsunami, with maximum wave amplitudes reaching ~5 m near Hong Kong and Macau, 1–3 m in western Philippines, and at least 1 m along central Vietnam, southeast Hainan, and southern Taiwan. The most noticeable phenomenon we observed is that the southern Chinese coast is the hardest‐hit region in all the simulated scenarios regardless of the diverse slide features. We conclude that the persistence of high tsunami impact is caused by the unique bathymetric feature of the wide continental shelf in front of southern China.

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Section: Resultssupporting

confidence: 84%

Section: Tsunami Modeling Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tsunamigenic Potential of the Baiyun Slide Complex in the South China Sea

Shi

et al. 2019

JGR Solid Earth

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“…In steeper areas (e.g., delta lips), mass failures occur frequently (1 to 5 or more per year on modern delta-lips) (Talling et al, 2013;Talling, 2014;Clare et al, 2016;Hizzett et al, 2018). In the study area, bathymetric and seismic data indicate that a paleo-delta extends to the shelf edge (Lüdmann et al, 2001;Zhou et al, 2015;Wang et al, 2017). However, because the present Pearl River delta is confined to the river estuary (Wei and Wu, 2011), the paleo-delta is likely not receiving large volumes of river-derived sediment and mass failure on the paleo-delta lip is probably infrequent.…”

Section: Erosion In Linear Zonesmentioning

confidence: 88%

Continental slope-confined canyons in the Pearl River Mouth Basin in the South China Sea dominated by erosion, 2004–2018

et al. 2019

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“…A series of submarine canyons have been reported in the northern SCS margin, including both modern and ancient examples (Figures and ; Zhu, Graham, Pang, & McHargue, ; Ding, Li, & Li, ; Harris & Whiteway, ; Zhou et al, ; Wang et al, ). In margin sector 1 of the YGH and western QDN margins, very few canyons are observed on the modern seafloor (Figure b).…”

Section: Along‐strike Variability In the Distribution Of Submarine Camentioning

confidence: 99%

Along‐strike variability in shelf‐margin morphology and accretion pattern: An example from the northern margin of the South China Sea

et al. 2018

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Interplays among diachronous tectonism, uneven sediment supply, and local marine hydraulic processes make the northern margin of the South China Sea (SCS) an ideal location to investigate the complexity of along‐strike variability in shelf margins. This study examines shelf‐margin morphology, stratigraphy, and sedimentation from the northern SCS using multichannel seismic reflection profiles complemented with the data from commercial and ocean drilling sites. Analysis of seismic reflection profiles reveals three categories of shelf‐margin cross‐sectional profiles, the concave‐up, linear, and sigmoidal, according to which five margin sectors were recognized. Results show that these margin segments differ in relief, shelf‐edge trajectory, submarine canyon development, and long‐term accretion pattern. The westernmost margin sector, or the Yinggehai (YGH)‐western Qiongdongnan (QDN) margin, has appeared to be supply dominated since its commencement at ca. 10.5 Ma, which is characterized by well‐developed prograding clinoforms, low‐angle shelf‐edge trajectories, and an absence of canyons. Presence of concave‐up profiles is also suggestive of high sediment influx. In contrast, the eastern QDN margin was primarily regulated by local subsidence and faulting, leading to a stationary shelf‐edge migrating pattern and linear upper‐slope morphology. Densely distributed slope‐confined gullies indicate the margin’s disequilibrium and erosive nature. Further east, the Pearl River Mouth (PRM) margin formed much earlier (ca. 30 Ma) and experienced a more complicated accretion history, including three phases which were dominated by sequential marginal faulting (before ca. 30 Ma), basement structure (ca. 30–23 Ma), and sediment supply (ca. 23 Ma to the present). The overall sigmoidal morphology and truncated stratigraphy of this margin probably resulted from the sculpting of local marine processes, especially ocean currents and internal waves. The exception of the central PRM margin where concave‐up profiles develop is mainly related to canyon erosion. Overall, this study highlights the vital role of local forcing factors in controlling along‐margin variations and determining the final fates of different margin segments. A comparison between the northern SCS and other well‐established examples reveals that concave‐upward shelf‐margin shapes, which are usually associated with high sediment supply, little influence from hydraulic regimes, or sometimes, high degree of canyon development, may be an indicator of good reservoir potential beyond the shelf edge.

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Genesis and evolution of the mass transport deposits in the middle segment of the Pearl River canyon, South China Sea: Insights from 3D seismic data

Cited by 32 publications

References 61 publications

Tsunamigenic Potential of the Baiyun Slide Complex in the South China Sea

Tsunamigenic Potential of the Baiyun Slide Complex in the South China Sea

Continental slope-confined canyons in the Pearl River Mouth Basin in the South China Sea dominated by erosion, 2004–2018

Along‐strike variability in shelf‐margin morphology and accretion pattern: An example from the northern margin of the South China Sea

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