Distributions and vertical variation patterns of sound speed of surface sediments in South China Sea |
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Institution: | 1. Laboratorio de Tecnología Ambiental, Instituto de Investigaciones Tecnológicas, Universidad de Santiago de Compostela, Bloque-A, Campus Universitario Sur, 15782 Santiago de Compostela, Spain;2. Department of Earth and Environmental Sciences, University of Windsor, Windsor, ON N9P 3P4, Canada |
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Abstract: | The distributions of sound speed show different characteristics in continental shelf, continental slope and Nansha Trough. The differences have closely related to the distributions of sediment physical properties in the southern South China Sea. According to the analysis of sound speeds and physical properties variation characteristics with buried depth, the vertical variations of sound speed are closely related to sediment texture, sedimentary environment, transport, erosion, compaction, consolidation, etc. The comparison results indicate 3 vertical variation patterns of sound speed: increasing model, invariant model and complicate variation model. The above 3 variation models represent the vertical distribution characteristics of sound speed in different depositional environments. Different variation patterns have different key factors which generally contain porosity or grain size. The calculated sound speeds with Buckingham’s theory of compressional waves in fluid-like marine sediments follows the trend of measured speeds accurately. |
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Keywords: | Distributions of sound speed Vertical variation patterns Surface sediments Physical properties |
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