Abstract: Temperature, salinity, and pressure are the three effectors of marine sediment’s physical, mechanical and acoustic properties. The authors focus on the effect of temperature perturbation on seafloor sediment, and study the spectrum Characteristics. They use the sediment remainder of the South China Sea, make artificial samples and then place them in a temperature-controlled environment, measure the sediment acoustic signals, and finally obtain the sediment’s spectrum characteristics by fast Fourier transform. The characteristics of temperature perturbation can be described by frequency drift, frequency amplitude, frequency bandwidth, and energy reception, respectively. For example, temperature contributes to the seafloor sediment’s spectrum regularity, with low repeatability; temperature increase enhances acoustic signal attenuation; frequency bandwidth and amplitude are negatively correlated, but the correlation of thermal-amplify is much clearer than thermal-bandwidth. The experiment suggests that the frequency in different temperature distinguishes the acoustics spectrum.

Key words: seafloor sediment, seafloor sediment, acoustics, acoustics, spectrum, spectrum, primary frequency, primary frequency, bandwidth, bandwidth