期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
卷 107, 期 B8, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2001JB000265
关键词
microseisms; wave climate; microseism source areas; Rayleigh wave attenuation; microseism propagation characteristics; ocean bottom seismometer
[1] Comparison of the ambient noise data recorded at near-coastal ocean bottom and inland seismic stations at the Oregon coast with both offshore and nearshore buoy data shows that the near-coastal microseism spectrum results primarily from nearshore gravity wave activity. Low double-frequency (DF), microseism energy is observed at near-coastal locations when seas nearby are calm, even when very energetic seas are present at buoys 500 km offshore. At wave periods >8 s, shore reflection is the dominant source of opposing wave components for near-coastal DF microseism generation, with the variation of DF microseism levels poorly correlated with local wind speed. Near-coastal ocean bottom DF levels are consistently similar to20 dB higher than nearby DF levels on land, suggesting that Rayleigh/Stoneley waves with much of the mode energy propagating in the water column dominate the near-coastal ocean bottom microseism spectrum. Monitoring the southward propagation of swell from an extreme storm concentrated at the Oregon coast shows that near-coastal DF microseism levels are dominated by wave activity at the shoreline closest to the seismic station. Microseism attenuation estimates between on-land near-coastal stations and seismic stations similar to150 km inland indicate a zone of higher attenuation along the California coast between San Francisco and the Oregon border.
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