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The effect of local wind on seismic noise near 1 Hz at the MELT site and in Iceland

The effect of local wind on seismic noise near 1 Hz at the MELT site and in Iceland


Titill: The effect of local wind on seismic noise near 1 Hz at the MELT site and in Iceland
Höfundur: Wilcock, William S. D.
Webb, Spahr C.
Bjarnason, Ingi Þorleifur   orcid.org/0000-0001-5716-7053
Útgáfa: 1999
Tungumál: Enska
Umfang: 1543-1557
Háskóli/Stofnun: Háskóli Íslands
University of Iceland
Svið: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Deild: Raunvísindastofnun (HÍ)
Science Institute (UI)
Birtist í: Bulletin of the Seismological Society of America;89(6)
Efnisorð: Jarðmöttull; Jarðeðlisfræði; Sneiðmyndatökur; Jarðskjálftar; Jarðskjálftamælingar
URI: https://hdl.handle.net/20.500.11815/572

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Tilvitnun:

William S. D. Wilcock, Spahr C. Webb, Ingi Þorleifur Bjarnason. (1999). The effect of local wind on seismic noise near 1 Hz at the MELT site and in Iceland. Bulletin of the Seismological Society of America, 89(6), 1543-1557.

Útdráttur:

The mantle electromagnetic and tomography (MELT) experiment on the east Pacific rise near 17°S was the first large teleseismic experiment on a midocean ridge. During the six-month deployment, no compressional arrivals were well recorded above 0.5 Hz. In comparison, the ICEMELT experiment in Iceland recorded compressional arrivals at 1-2 Hz from about 2 earthquakes per month. We compare noise spectra from the two experiments and show that this difference in detection is at least in part a result of noise. Near 1 Hz, seismic noise in the oceans is produced locally by wind-generated waves. At both experiment sites, 1-Hz noise levels are well correlated with local sea-surface-wind speeds derived from satellite observations. For a given wind speed, 1-Hz noise levels are about 10-20 dB lower in Iceland. At the MELT site, cross-correlations of wind speed with the logarithm of noise in a narrow-frequency band yield correlation coefficients exceeding 0.7 at frequencies between 0.4 Hz and 2 Hz. Noise levels at 1 Hz increase with wind by 1.3-1.4 dB per m/sec for wind speeds less than 10 m/sec. For the ICEMELT experiment, high correlation coefficients extend to markedly higher frequencies for coastal stations, and there is a 10-dB drop in 1-Hz noise levels 100-km inland. Noise levels increase by about 0.8 dB per m/sec. The strong correlation between wind speed and l-Hz seismic noise provides justification for using satellite wind speed data to search for locations on the global spreading system where there is a better probability of recording high-frequency arrivals. The calmest sites are found on the northern east Pacific rise, near the equator in all oceans, and near 34 ° N and 22 ° S on the mid- Atlantic ridge.

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