西菲律宾海深水沉积物的声速结构特征

周娇; 田雨杭; 何高文; 罗伟东; 杨楚鹏; 谭玉芳

doi:10.3799/dqkx.2025.024

Volume 50 Issue 7

Jul. 2025

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Article Navigation > Earth Science > 2025 > 50(7): 2899-2911

Zhou Jiao, Tian Yuhang, He Gaowen, Luo Weidong, Yang Chupeng, Tan Yufang, 2025. Characteristics of Sound Velocity Structure in Deep Water Sediments of West Philippine Sea. Earth Science, 50(7): 2899-2911. doi: 10.3799/dqkx.2025.024

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Zhou Jiao, Tian Yuhang, He Gaowen, Luo Weidong, Yang Chupeng, Tan Yufang, 2025. Characteristics of Sound Velocity Structure in Deep Water Sediments of West Philippine Sea. Earth Science, 50(7): 2899-2911. doi: 10.3799/dqkx.2025.024

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Characteristics of Sound Velocity Structure in Deep Water Sediments of West Philippine Sea

doi: 10.3799/dqkx.2025.024

Zhou Jiao^{1, 2
,
,},
Tian Yuhang³,
He Gaowen^{1, 2},
Luo Weidong^{1, 2},
Yang Chupeng^{1, 2},
Tan Yufang^{1, 2}

1.
Key Laboratory of Marine Mineral Resources, Ministry of Natural Resources, Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China
2.
National Engineering Research Center for Gas Hydrate Exploration and Development, Guangzhou 511458, China
3.
Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2024-09-12
Publish Date: 2025-07-25

Abstract

Abstract

The sound velocity of deep-sea sediments is fundamental for constructing the acoustic field of the marine environment. This article tests and analyzes parameters such as longitudinal wave velocity, wet density, porosity, and median particle size of sediment column samples obtained from the deep waters of 4 818-6 630 m in the West Philippine Sea. It elucidates the basic characteristics and vertical variations of acoustic and physical parameters of seabed sediments in the study area, explores the relationship between physical parameters and sound velocity, compares measured data with empirical equation predictions, and proposes four typical sound velocity structures of seabed sediments in the study area. The results show that the longitudinal wave velocity distribution of sediment ranges from 1 460 to 1 674 m/s, the porosity ranges from 62.07% to 69.54%, the wet density varies from 1.34 to 1.62 g/cm³, and the median particle size varies from 7.75 to 8.40 Φ. The sediment parameters in the study area vary with depth, and density has a better effect on sound velocity than porosity and median particle size. By comparing the sound velocity of the bottom seawater, the sound velocity profile within the same layer, and the sound velocity of the lower surface of the upper seabed sediment, four types of sound velocity structure models were established in the research area, involving low velocity surface-low velocity layer-sound velocity reduction type (GMI1), low velocity surface-high velocity layer-sound velocity increase type (GMI2), high velocity surface-low velocity layer-sound velocity rreduction type (GMII1), and high velocity surface-high velocity layer-sound velocity increase type (GMII2).There are significant differences in the acoustic characteristics and sound velocity gradient changes of sediments in the southern (Zone A) and northern (Zone B) regions of the Central Rift Valley. Zone A can be divided into GMII1 and GMII1-GMI1 types, while Zone B can be divided into GMI2 and GMI1-GMII2 types.
- sound velocity characteristic,
- sound velocity structure,
- geoacoustic model,
- physical parameter,
- deep-sea sediment,
- West Philippine Sea,
- marine geology

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Characteristics of Sound Velocity Structure in Deep Water Sediments of West Philippine Sea

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