Very low frequency Ocean Bottom ambient seismic noise and coupling on the shallow continental shelf
Very low frequency Ocean Bottom ambient seismic noise and coupling on the shallow continental shelf
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甚低频海底环境地震噪声与浅大陆架耦合
DOI：
10.1007/bf00285664
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
M. Badiey
中科院分区：
文献类型：
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作者：
M. Trevorrow;Tokuo J. Yamamoto;A. Turgut;D. Goodman;M. Badiey
利用海底地震仪(OBS)研究了浅水(<；100m)大陆边缘沉积物中极低频率(0.01~1.0 Hz)环境地震噪声源。研究发现，地表重力(水)波和水-沉积物界面波是主要的地震运动。给出了海床加速度和动水压力的实际实验测量，包括埋藏式和板式OBS装置的并列比较。研究发现，在研究的低频下，OBS-沉积物的共振效应可以忽略不计。然而，在海床和水之间存在相对运动的任何地方，暴露的OBS都会受到“附加质量”力的影响，使其随水而不是沉积物移动。基于测量的海底运动的计算表明，中性密度的埋藏式地震仪具有比任何暴露的OBS设计更好的沉积物耦合特性。
Sources of very low frequency (0.01 to 1.0 Hz) ambient seismic noise in the shallow (<100 m) water continental margin sediments are investigated using Ocean Bottom Seismometers (OBS). The predominant seismic motions are found to be due to surface gravity (water) waves and water-sediment interface waves. Actual experimental measurements of seabed acceleration and hydrodynamic pressure are given, including side by side comparisons between buried and plate-mounted OBS units. OBS-sediment resonant effects are found to be negligible at the low frequencies under investigation. Wherever there exists relative motion between the seabed and the water, however, an exposed OBS is subject to ‘added mass’ forces that cause it to move with the water rather than the sediments. Calculations based on measured seabed motions show that a neutral density, buried seismometer has superior sediment coupling charactersitics to any exposed OBS design.