Mechanism of deep-water international submarine cables damage: submarine earthquakes

ZHANG Mengran, XIE Anyuan, HE Huizhong, LU Rong, TANG Minqiang

Journal of Marine Sciences ›› 2024, Vol. 42 ›› Issue (4) : 100-113.

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Journal of Marine Sciences ›› 2024, Vol. 42 ›› Issue (4) : 100-113. DOI: 10.3969/j.issn.1001-909X.2024.04.009

Mechanism of deep-water international submarine cables damage: submarine earthquakes

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Abstract

Submarine earthquake is one of the most major factors causing deep-water international submarine cables damage. Understanding the process of submarine cables damage and the mechanism of submarine cables damage caused by turbidity currents after earthquake are of great significance to the security maintenance of international submarine communications. Combined with the lastest research result of global seabed topography and using professional international submarine cables engineering software Makaiplan, the process of plenty of submarine cables damage after Grand Banks Earthquake and Hengchun Earthquake were studied, then the relationship between the pattern of submarine cable damage and the developing process of turbidity currents after earthquake was found, and the mechanism of submarine cables damage caused by turbidity currents after earthquake was summarized. Study result shows that submarine cables break points are located intentively in submarine canyons and trenches. The movement speed of turbidity currents in submarine canyon and submarine trench, which caused submarine cable damage, can reach several ten kilometers to several hundred kilometres per hour. Terrestrial rivers and continental shelf undersea river channels provide materials transportation for the development of turbidity currents. Submarine canyons and trenchs are the pathes of turbidity currents movement then damage plenty of submarine cables. The turbidity currents that developed from upper continental slope in passive continental margin after earthquake can damage submarine cables laid on continental slope, continental rise and abyssal plain. This kind of turbidity currents achieves maximum speed on continental slope, then self-accelerate on abyssal plain. Multiple turbidity currents can develop at different positions of continental slope at the same time in active continental margin, then strike submarine cables which laid on canyons and trenches for multiple times. This kind of turbidity currents achieves maximum speed and self-accelerates in submarine trenches. There are several earthquake-resistance measures: submarine cable routes trying to avoid crossing submarine canyons and trenches which connected to terrestrial rivers or continental shelf channels; using shallow water type submarine cable which has outer armor protection when crossing inevitably; laying submarine cables suspended slightly on the bottom of canyons or trenches with Uraduct protection on them; changing the cross-section shape of submarine cable.

Key words

submarine earthquake / deep-water cables / submarine canyon / submarine trench / turbidity currents / self-accelerate / mechanism / earthquake-resistance measures

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ZHANG Mengran , XIE Anyuan , HE Huizhong , et al . Mechanism of deep-water international submarine cables damage: submarine earthquakes[J]. Journal of Marine Sciences. 2024, 42(4): 100-113 https://doi.org/10.3969/j.issn.1001-909X.2024.04.009

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Abstract
Makailay软件是专门用于海底电缆收放的软件,本文通过对该软件工作原理及放缆实例的分析,重点阐述了该软件在沙特红海某二维深水过渡带项目节点释放过程中起到的指导作用及其对深水节点点位精度的提高。建议在以后的深海地震勘探项目中推广应用,以提高放缆精度。
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