Spectral Analysis and Statistical Properties of Microseisms at Norsar PDF Download
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Author: Eivind Rygg
Publisher:
ISBN:
Category : Microseisms
Languages : en
Pages : 44
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Book Description
Below 0.7 cps the seismic noise recorded by the short period seismometers at NORSAR (Norwegian Seismic Array) is generally dominated by sources in the Atlantic and on the Norwegian coast. When strong low pressure areas are observed outside the coast, the noise has a dominating direction of propagation from the low, and a velocity generally in the range 3-4 km/sec. A low in the Baltic Sea has been found to contribute more to the noise at higher frequencies than the Atlantic sources, its influence extending to lower frequencies as the low moves towards the array. Strong local winds have been found to have little influence in the microseismic range. The noise coherence between sensors is some times much higher in the direction of dominating noise propagation than in other directions. This seems to happen when the noise level is high and when the lows are close to the coast. From the distribution of the sample variances it is assumed that the noise is stationary within half-hour intervals used in the noise analysis. The noise predictability has a maximum during periods with high microseismic activity. (Author).
Author: Eivind Rygg
Publisher:
ISBN:
Category : Microseisms
Languages : en
Pages : 44
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Book Description
Below 0.7 cps the seismic noise recorded by the short period seismometers at NORSAR (Norwegian Seismic Array) is generally dominated by sources in the Atlantic and on the Norwegian coast. When strong low pressure areas are observed outside the coast, the noise has a dominating direction of propagation from the low, and a velocity generally in the range 3-4 km/sec. A low in the Baltic Sea has been found to contribute more to the noise at higher frequencies than the Atlantic sources, its influence extending to lower frequencies as the low moves towards the array. Strong local winds have been found to have little influence in the microseismic range. The noise coherence between sensors is some times much higher in the direction of dominating noise propagation than in other directions. This seems to happen when the noise level is high and when the lows are close to the coast. From the distribution of the sample variances it is assumed that the noise is stationary within half-hour intervals used in the noise analysis. The noise predictability has a maximum during periods with high microseismic activity. (Author).
Author: James N. Murdock
Publisher:
ISBN:
Category : Microseisms
Languages : en
Pages : 106
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Author: H. Korhonen
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ISBN:
Category :
Languages : en
Pages : 38
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References:p.31-32.
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Category : Aeronautics
Languages : en
Pages : 1022
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Author: United States. Environmental Science Services Administration
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ISBN:
Category :
Languages : en
Pages : 88
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Author:
Publisher:
ISBN:
Category : Earth sciences
Languages : en
Pages : 636
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Author:
Publisher:
ISBN:
Category : Seismology
Languages : en
Pages : 88
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"During the past several years the ESSA Earthquake Research Committee (ERC) has conducted an annual scientific review of all Earthquake Research being done in ESSA. This year the scientific review meeting was held in Boulder, Colorado on 8 and 9 July 1970. All organizational elements of ESSA were encourages to be represented by qualified working scientists who could properly review their entire Earthquake Research program. This review was to include all work being done for ESSA by outside grantees and contractors as well as in house research. The grantees and contractors in most cases were invited to attend and present their own work"--Introduction
Author: Institute for Earth Sciences
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ISBN:
Category : Earth (Planet)
Languages : en
Pages : 748
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Author:
Publisher:
ISBN:
Category : Earth (Planet)
Languages : en
Pages : 592
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Author: James Nelson Galbraith (Jr)
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ISBN:
Category :
Languages : en
Pages : 1
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Computational experiments have been performed on seismic data digitized from the records obtained by the Air Force during the Logan and Blanca underground nuclear shots, by Dr. Bruce Bogert in New Jersey and by the Wichita Mountain Seismic Observatory. The experiments indicate that microseismic noise of about .3 cps frequency is associated with the oceans but the higher fre quencies are not. Attempts to identify definite wave types, such as Rayleigh and Love waves, and to follow wave packets from station to station failed, but the failure illustrated the com plexity of the microseisms and points out the necessity of a statistical study. For the sta tistical studies the microseisms were considered to be stochastic time series. It was found that the probability densities of the amplitudes were Gaussian and were not independent. Spectral analysis showed the typical microseism spectrum to have a maximum at about .3 cps and often other strong bands at 1.4 and 2 cps. (Author).
