Very low frequency ambient noise at the seafloor under the Beaufort Sea icecap
Very low frequency ambient noise at the seafloor under the Beaufort Sea icecap
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波弗特海冰盖下海底的极低频环境噪声
DOI：
10.1121/1.402474
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
A. Schultz
中科院分区：
文献类型：
--
作者：
S. Webb;A. Schultz
报告了1990年3月在波弗特海海底部署四台仪器的第一批结果。这些仪器在两周的时间里记录了从0.0005赫兹到8赫兹的压力波动。这些测量得到的压力谱显示，与太平洋或大西洋海底的测量结果相比，0.1赫兹附近微震峰值的能量非常低。微震频带显示了一系列可能与海洋-海底瑞利波波导的模式有关的波峰和波谷。微震峰的形状在实验过程中非常稳定，尽管幅度变化了约10d B。相邻仪器之间的信号非常一致，表明阿拉斯加湾的一个震源在微震频段内传播。压力谱在0.02赫兹以下迅速向更低的频率上升，但北极的谱在所有频率下都比太平洋或大西洋海底的谱能量低。漫长的时期..。
The first results from a deployment of four instruments on the floor of the Beaufort Sea in March 1990 are presented. The instruments recorded pressure fluctuations in the band from 0.0005 to 8 Hz during a 2‐week period. The pressure spectra derived from these measurements show very low energy in the microseism peak near 0.1 Hz in comparison with measurements from the Pacific or Atlantic seafloor. The microseism band shows a series of spectral peaks and valleys likely associated with the modes of the ocean–seafloor Rayleigh wave waveguide. The shape of the microseism peak is remarkably stable during the experiment although the amplitude varies by about 10 dB. The signals are very coherent between adjacent instruments and suggest propagation in the microseism band from a source in the Gulf of Alaska. The pressure spectra rise rapidly toward lower frequency below 0.02 Hz, but Arctic spectra are less energetic than spectra from sites on either Pacific or Atlantic seafloors at all frequencies. The long period...