scholarly journals Time-domain study of tectonic strain-release effects on seismic waves from underground nuclear explosions

1982 ◽  
Author(s):  
K.K. Nakanishi ◽  
N.W. Sherman
Keyword(s):  
Time Domain ◽  
Seismic Waves ◽  
Underground Nuclear Explosions ◽  
Nuclear Explosions ◽  
Strain Release

Earthquakes and faults

1963 ◽  
Vol 53 (5) ◽  
pp. 873-891 ◽  
Author(s):  
F. F. Evison
Keyword(s):  
Seismic Waves ◽  
Surface Phenomenon ◽  
Local Phase ◽  
Fault Creep ◽  
Satisfactory Explanation ◽  
Underground Nuclear Explosions ◽  
Nuclear Explosions ◽  
Shallow Earthquakes ◽  
Deep Focus ◽  
Natural Earthquakes

Abstract The hypothesis that earthquakes are caused by faulting has been prominent in seismological theory for half a century, but continues to present many difficulties. Although the chief support comes from studies of large shallow earthquakes that have been accompanied by surface faulting, the evidence given by these infrequent events can be interpreted otherwise. No satisfactory explanation of deep-focus earthquakes has emerged; sudden faulting may be essentially a surface phenomenon. Nor does the hypothesis aid the understanding of such phenomena as sudden regional uplift, or slow fault creep. There is much to encourage the view that fracture of the ground is but a gross form of earthquake damage. On the other hand, the similarity between natural earthquakes and underground nuclear explosions, as radiators of seismic waves, suggests that sudden local phase transitions may provide a source mechanism for earthquakes at all depths.

Amplitudes and energies of primary seismic waves near the hardhat, haymaker, and shoal nuclear explosions

1966 ◽  
Vol 56 (3) ◽  
pp. 643-653 ◽  
Author(s):  
Lynn D. Trembly ◽  
Joseph W. Berg
Keyword(s):  
Theoretical Model ◽  
Seismic Waves ◽  
Theoretical Data ◽  
Source Model ◽  
Similar Data ◽  
Underground Nuclear Explosions ◽  
Nuclear Explosions ◽  
Long Period ◽  
Radiation Fields ◽  
Amplitude Data

abstract Records of near-source (0.3 to 20 km) primary seismic waves generated by the Hardhat, Haymaker, and Shoal underground nuclear explosions were analyzed in terms of displacement amplitude and energy variations with distance. The observed data were compared to similar data from a theoretical source model to determine the adequacy of the theoretical model. There was evidence that a long-period displacement field existed near the explosions as predicted by the theoretical source. Scatter in the observed amplitude data made it difficult to distinguish between the long-period and the radiation fields. However, the variation of total energy of the observed primary seismic waves with distance showed the presence of the long-period field. The comparison of observed and theoretical data indicates that a theoretical elastic source model approximated the observed sources.

Synthesis of nonstationary seismic signals

1970 ◽  
Vol 60 (5) ◽  
pp. 1615-1624 ◽  
Author(s):  
Paul R. Beaudet
Keyword(s):  
Seismic Waves ◽  
Radial Component ◽  
Synthetic Seismograms ◽  
Time Varying ◽  
Analog Filter ◽  
Stationary Characteristic ◽  
Underground Nuclear Explosions ◽  
Nuclear Explosions ◽  
Wide Range ◽  
Noise Input

Abstract Synthetic seismograms are a powerful tool which can be used to approximate the complex signature which an inhomogeneous, anisotropic, and imperfectly elastic Earth imparts to seismic waves generated by underground nuclear detonations. The concept and design of a time-varying analog filter for generating synthetic seismograms which approximate real seismograms observed from underground nuclear explosions have been developed. The basic design of this filter exploits a non-stationary characteristic commonly observed on seismograms, the gradual increase of period with time. The parameters of the time-varying analog filter were determined on the basis of the characteristics of the radial component of 50 seismograms recorded from underground nuclear detonations encompassing a wide range of yields (80 to 1000 kt) and distances (50 to 550 km) from the detonation. These parameters determine the time-varying response of the analog filter to a white noise input. The comparison of the spectra of synthetic and real seismograms indicates that the synthetic seismograms generated with the time-varying analog filter are close approximations to real seismograms having equivalent yield and range parameters.

Review of seismic source models for underground nuclear explosions

1981 ◽  
Vol 71 (4) ◽  
pp. 1249-1268 ◽  
Author(s):  
Robert P. Massé
Keyword(s):  
Seismic Source ◽  
Source Model ◽  
Underground Nuclear Explosions ◽  
Nuclear Explosions ◽  
Thrust Faulting ◽  
Seismic Source Models ◽  
Regional Source ◽  
Source Models ◽  
Strain Release ◽  
Wave Conversion

abstract A number of seismic source models for underground nuclear explosions have been developed over the past 2 decades. These models include the spherically symmetric compressional source model, the wave conversion source model, the tectonic strain release source model, the spall slapdown source model, and the near-regional source model. These model are reviewed in this study and are shown to be inconsistent with various geophysical data associated with underground nuclear explosions. In particular, the Rayleigh and Love wave signals generated by underground nuclear explosions have not been explained satisfactorily by any of these source models. To explain the observed explosion data, it may be necessary to model the explosion seismic source as a sequence of mechanisms producing seismic signals. These mechanisms all act within the first few seconds following the explosion detonation. One of the most important of these mechanisms is probably explosion-induced thrust faulting.

scholarly journals Discriminating underground nuclear explosions leading to late-time radionuclide gas seeps

2020 ◽  
Author(s):  
Dylan Robert Harp ◽  
Suzanne Michelle Bourret ◽  
Philip H. Stauffer ◽  
Ed Michael Kwicklis
Keyword(s):  
Late Time ◽  
Underground Nuclear Explosions ◽  
Nuclear Explosions ◽  
Gas Seeps
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