Determining surface-wave magnitudes from regional Nevada Test Site data

Bradley B. Woods; David G. Harkrider

doi:10.1111/j.1365-246x.1995.tb01833.x

Determining surface-wave magnitudes from regional Nevada Test Site data

Geophysical Journal International ◽

10.1111/j.1365-246x.1995.tb01833.x ◽

1995 ◽

Vol 120 (2) ◽

pp. 474-498 ◽

Cited By ~ 2

Author(s):

Bradley B. Woods ◽

David G. Harkrider

Keyword(s):

Surface Wave ◽

Test Site ◽

Nevada Test Site

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Theoretical and observed distance corrections for Rayleigh-wave magnitude

Bulletin of the Seismological Society of America ◽

10.1785/bssa0620061611 ◽

1972 ◽

Vol 62 (6) ◽

pp. 1611-1619 ◽

Cited By ~ 2

Author(s):

R. W. Alewine

Keyword(s):

Surface Wave ◽

Energy Dissipation ◽

Rayleigh Wave ◽

Test Site ◽

Nevada Test Site ◽

Surface Wave Magnitude ◽

Dissipation Coefficient ◽

Distance Relation ◽

Energy Dissipation Coefficient ◽

Distance Correction

abstract Examination of the distance correction factor used in the widely accepted formula for surface-wave magnitude reveals that this empirically derived linear formula fails to give an accurate approximation to the theoretical nonlinear amplitude-distance relation for epicentral distances less than 15°. For epicentral distances greater than 15°, the empirical formula contains an implied oceanic-type energy-dissipation coefficient. When the original Gutenberg theoretical surface-wave magnitude formula with an appropriate continental energy-dissipation coefficient is applied to explosion data from the Nevada Test Site, a consistent surface-wave magnitude is obtained at all distances. A systematic method of normalizing Rayleigh-wave magnitudes obtained over different types of propagation paths is suggested. This normalization might provide a means for better separating natural events and explosions in the mb—Ms plots.

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Canadian detection and discrimination thresholds for earthquakes and underground explosions in Asia

Canadian Journal of Earth Sciences ◽

10.1139/e69-147 ◽

1969 ◽

Vol 6 (6) ◽

pp. 1455-1458 ◽

Cited By ~ 5

Author(s):

P. W. Basham

Keyword(s):

Surface Wave ◽

Surface Waves ◽

Central Asia ◽

Body Wave ◽

Test Site ◽

Discrimination Threshold ◽

Nevada Test Site ◽

Novaya Zemlya ◽

Seismograph Network

A suite of 33 Asian earthquakes and 36 Central Asia and Novaya Zemlya underground explosions are used to define the minimum detection levels in terms of surface-wave and body-wave magnitudes and the discrimination thresholds of the M versus m discriminant for the Canadian seismograph network. Under low microseismic noise conditions surface-waves can be observed for earthquakes down to m 4.9 and explosions down to m 5.9 for the region near the central Asia test sites. For events above these magnitudes, the M versus m relationships provide reliable discrimination between earthquakes and explosions. Comparison with an intracontinental study leads to the conclusion that the discrimination threshold is limited by path effects and greater distances to events about m 1.0 larger near the Asian test sites than near the Nevada test site.

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