Distribution and development characteristics of submarine pockmarks on the south side of Riji Reef

Wang Jiahao; Shang Jihong; Wu Ziyin; Zhao Dineng; Zhu Chao; Liu Zhihao; Cui Binghao

doi:10.12284/hyxb2023089

Volume 45 Issue 6

Jun. 2023

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Wang Jiahao，Shang Jihong，Wu Ziyin, et al. Distribution and development characteristics of submarine pockmarks on the south side of Riji Reef[J]. Haiyang Xuebao，2023, 45(6)：62–74 doi: 10.12284/hyxb2023089

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Distribution and development characteristics of submarine pockmarks on the south side of Riji Reef

doi: 10.12284/hyxb2023089

Wang Jiahao^{1, 2
,},
Shang Jihong^{1, 2
,
,},
Wu Ziyin^{1, 2, 3},
Zhao Dineng^{1, 2, 4},
Zhu Chao^{1, 2, 5},
Liu Zhihao^{1, 2, 3},
Cui Binghao^{1, 2, 6}

1.
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
2.
Key Laboratory of Submarine Geoscience, Ministry of Natural Resources, Hangzhou 310012, China
3.
School of Oceanography, Shanghai Jiao Tong University, Shanghai 200240, China
4.
Donghai Laboratory, Zhoushan, 316021, China
5.
Ocean College, Zhejiang University, Hangzhou 316021, China
6.
College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China

Received Date: 2022-10-27
Rev Recd Date: 2023-01-17

Available Online: 2023-07-19

Publish Date: 2023-06-30

Abstract

Abstract

Submarine pockmark is a depression landform formed by fluid spilling out of the seabed along the migration path and eroding the seafloor sediments. In this paper, the distribution and development of pockmarks on the south side of Riji Reef in the South China Sea are studied by using high-resolution bathymetric data and sub-bottom profile data. Based on the characteristics of high-resolution geomorphology and the laws of sub-bottom profile, 219 large scale pockmarks in the area were identified and counted, there is weak correlation between seawater depth and pockmark scale: seawater depth has no obvious positive correlation with diameter and depth of pockmark, and has no obvious negative correlation with inner slope of pockmark. It reveals the internal relationship between the special geomorphology and the distribution, shape and change of pockmark: the round and elliptical pockmarks are mostly distributed on the top of the sea knoll, the half-moon type pockmarks are mostly distributed in the middle and lower part of the sea knoll, while the bead-like elongated type pockmarks are mainly distributed in the canyon between the deep sea knolls. It is concluded that the change of the pockmark shape and scale which are from the top of the sea knoll to the canyon directly corresponds to the development process of the pockmark in different stages, and that the pockmarks are essentially influenced by the tectonics and dynamics control of the area.
- pockmark,
- tectonic geomorphology,
- genesis,
- evolution

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References(45)

References

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