Improved body-wave magnitudes of Aleutian earthquakes

Tarr, Arthur C.

doi:10.2172/4486733

1971

DOI: 10.2172/4486733

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Improved body-wave magnitudes of Aleutian earthquakes

Arthur C. Tarr¹

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1975

1976

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Cited by 2 publications

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Seismic intensities, “size” of earthquakes and related parameters

Evernden

1975

Bulletin of the Seismological Society of America

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The simple model of an earthquake used in Evernden, et al. (1973) was extended to the conterminous United States and observed patterns of isoseismals for major earthquakes studied in relation to the model. Regional attenuation, a known major factor controlling isoseismal patterns, was quantitatively evaluated. Incorporating this regional variation into the model results in the prediction that in terms of energy released, the San Francisco earthquake of 1906 was 50 times as large as Owens Valley 1872 and more than 100 times larger than the Charleston 1886 and New Madrid 1811 earthquakes. All of these were probably of comparable “magnitude”. Other relevant parameters are investigated. Analysis of probability of occurrence of major earthquakes in the Eastern United States suggests average annual return times of intensity X and IX of thousands of years at least. Presently unknown local conditions may lead to much greater probabilities at some localities, and the importance of developing procedures for determining regions of abnormally high risk is stressed.

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Seismic intensities, “size” of earthquakes and related parameters

Evernden

1975

Bulletin of the Seismological Society of America

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Bias in estimates of mb at small magnitudes

Evernden

Köhler

1976

Bulletin of the Seismological Society of America

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A possibly significant factor in application of an identification criterion such as MS:mb is systematic bias in mb magnitude estimates at small magnitudes due to a variety of factors. Magnitude bias is the difference in magnitude value, positive or negative, between an observed network-based magnitude value and the expected magnitude value if all stations of the network had detected the event at high signal-to-noise ratio. This paper constitutes a partial study of the general problem; it evaluates the bias effects expected from both conceptual and operational networks when using parameters for noise and signal levels and standard deviations derived from observations, and when correcting observed station mb values solely via a simple parameter station correction factor. The analysis shows that any bias effects on mb inherent in any operational or potential worldwide network are so small as to have negligible effect on use of an MS:mb discriminant.

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Improved body-wave magnitudes of Aleutian earthquakes

Cited by 2 publications

References 4 publications

Seismic intensities, “size” of earthquakes and related parameters

Seismic intensities, “size” of earthquakes and related parameters

Bias in estimates of mb at small magnitudes

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