A Comparative Analysis of the Seismic Characteristics of Cavity Decoupled Nuclear and Chemical Explosions.

Murphy, John; Barker, B. W.

doi:10.21236/ada304812

Cited by 5 publications

(7 citation statements)

References 11 publications

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“…The high frequency S or Lg from explosions may be due to the generation of new cracks generated by a tamped explosion (Blandford, 1995a, b), but the evidence presented so far has probably not been fully convincing (Murphy and Barker, 1995). We therefore test Blandford's (1995a, b) hypothesis by examining data from several sources.…”

Section: Importance Of High-frequency S or Lgmentioning

confidence: 96%

“…Blandford's (1995a) analysis also indicated that the higher frequency S/P should decrease with shot depth because of greater overburden pressure which should inhibit cracking. However, an examination of Blandford's (1995a) and some other data by Murphy and Barker (1995) led them to conclude that the seismic characteristics of decoupled and coupled explosions are generally quite similar. According to Blandford (1995b), "the problem of high-frequency S generation from cracks is unsolved and there is no assurance that the high frequency S actually comes from such cracks".…”

Section: High Frequency S or Lg From Explosionsmentioning

confidence: 99%

“…Murphy and Barker (1995) also analyzed Salmon and Sterling data at several local distances, including 10S (16 km), 20S (32 km), and PL-MS (27 km). They found that the filtered signals at 20S and PL-MS showed larger S/P ratios for Salmon than for Sterling, in agreement with Blandford's hypothesis.…”

Section: Re-examination Of Salmon/sterling Data At Local Distancesmentioning

confidence: 99%

“…A possible reason is site effects. In Figures 26 and 28, the data from Sensor 9 are the same as those used by Murphy and Barker (1995, Figure 19). The beginning of the P and S windows are the same used by Murphy and Barker (1995) and vertical lines have been drawn to indicate window lengths of 1 and 2 sec for P and S, respectively.…”

Section: Re-examination Of Salmon/sterling Data At Local Distancesmentioning

confidence: 99%

“…In Figures 26 and 28, the data from Sensor 9 are the same as those used by Murphy and Barker (1995, Figure 19). The beginning of the P and S windows are the same used by Murphy and Barker (1995) and vertical lines have been drawn to indicate window lengths of 1 and 2 sec for P and S, respectively. Bandpassed outputs for frequency ranges of 12-16, and 16-20 Hz for the two events (Salmon in red and Sterling in black) are shown in Figures 29 through 32, in which the peak amplitudes in the P windows for the two events have been adjusted to be the same.…”

Section: Re-examination Of Salmon/sterling Data At Local Distancesmentioning

confidence: 99%

See 4 more Smart Citations

Study of Low and Lg from Explosions and Its Application to Seismic Monitoring of the CTBT

Gupta¹,

Wagner²

1998

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Section: Importance Of High-frequency S or Lgmentioning

confidence: 96%

Section: High Frequency S or Lg From Explosionsmentioning

confidence: 99%

Section: Re-examination Of Salmon/sterling Data At Local Distancesmentioning

confidence: 99%

Section: Re-examination Of Salmon/sterling Data At Local Distancesmentioning

confidence: 99%

Section: Re-examination Of Salmon/sterling Data At Local Distancesmentioning

confidence: 99%

See 3 more Smart Citations

Study of Low and Lg from Explosions and Its Application to Seismic Monitoring of the CTBT

Gupta¹,

Wagner²

1998

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Cavity Decoupling of Small Explosions in Limestone

Stroujkova¹,

Reinke

Duray

et al. 2014

Bulletin of the Seismological Society of America

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Effects of explosion depth and earth structure on the excitation ofLgwaves:S*revisited

Vogfjörd

1997

Bulletin of the Seismological Society of America

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Effects of explosion depth in 1D velocity structure on the amplitude and character of Lg are examined. For shallow spherical explosions, the S* wave can be a significant contributor to Lg. Its amplitude, however, decays exponentially with source depth, and for that reason, S* has usually been dismissed as insignificant for all but the shallowest source depths. However, the radiation pattern of S* has a narrow peak (<10°) at φd = sin−1(β/α)surface, where amplitudes are larger than in the original P wave. The width and amplitude of this peak also decrease with increasing source depth, but amplitudes at frequencies in the ∼1-Hz range remain significant for depths to at least 1 km. In favorable velocity structures, where αsurface ≦ βmantle, the radiation peak is trapped in the crust and S* in Lg can dominate seismograms from spherical explosions at depths down to 1 km. In such structures, the character of Lg may also be determined by whether the radiation peak ends up as turning waves or Moho reflections. Decoupled nuclear explosions may be most spherical-explosion-like, and the characteristics of S*-dominated Lg may be representative of observations from decoupled explosions, thus possibly providing a way of discriminating them from other shallow sources.

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A Comparative Analysis of the Seismic Characteristics of Cavity Decoupled Nuclear and Chemical Explosions.

Cited by 5 publications

References 11 publications

Study of Low and Lg from Explosions and Its Application to Seismic Monitoring of the CTBT

Study of Low and Lg from Explosions and Its Application to Seismic Monitoring of the CTBT

Cavity Decoupling of Small Explosions in Limestone

Effects of explosion depth and earth structure on the excitation ofLgwaves:S*revisited

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