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Title: Seismic source functions from free-field ground motions recorded on SPE: Implications for source models of small, shallow explosions

Abstract

In this, reduced displacement potentials (RDPs) for chemical explosions of the Source Physics Experiments (SPE) in granite at the Nevada Nuclear Security Site are estimated from free-field ground motion recordings. Far-field P wave source functions are proportional to the time derivative of RDPs. Frequency domain comparisons between measured source functions and model predictions show that high-frequency amplitudes roll off as ω-2, but models fail to predict the observed seismic moment, corner frequency, and spectral overshoot. All three features are fit satisfactorily for the SPE-2 test after cavity radius Rc is reduced by 12%, elastic radius is reduced by 58%, and peak-to-static pressure ratio on the elastic radius is increased by 100%, all with respect to the Mueller-Murphy model modified with the Denny-Johnson Rc scaling law. A large discrepancy is found between the cavity volume inferred from RDPs and the volume estimated from laser scans of the emplacement hole. The measurements imply a scaled Rc of ~5 m/kt1/3, more than a factor of 2 smaller than nuclear explosions. Less than 25% of the seismic moment can be attributed to cavity formation. A breakdown of the incompressibility assumption due to shear dilatancy of the source medium around the cavity is the likelymore » explanation. New formulas are developed for volume changes due to medium bulking (or compaction). A 0.04% decrease of average density inside the elastic radius accounts for the missing volumetric moment. Assuming incompressibility, established Rc scaling laws predicted the moment reasonable well, but it was only fortuitous because dilation of the source medium compensated for the small cavity volume.« less

Authors:
ORCiD logo [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
Contributing Org.:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); National Security Technologies, LLC. (NSTec), Las Vegas, NV (United States)
OSTI Identifier:
1468564
Alternate Identifier(s):
OSTI ID: 1402187
Report Number(s):
LA-UR-14-28317
Journal ID: ISSN 2169-9313
Grant/Contract Number:  
AC52-06NA25396; AC52‐06NA25946
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 120; Journal Issue: 5; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; 58 GEOSCIENCES; chemical explosions; seismic source functions; source models

Citation Formats

Rougier, Esteban, and Patton, Howard J. Seismic source functions from free-field ground motions recorded on SPE: Implications for source models of small, shallow explosions. United States: N. p., 2015. Web. doi:10.1002/2014JB011773.
Rougier, Esteban, & Patton, Howard J. Seismic source functions from free-field ground motions recorded on SPE: Implications for source models of small, shallow explosions. United States. doi:10.1002/2014JB011773.
Rougier, Esteban, and Patton, Howard J. Mon . "Seismic source functions from free-field ground motions recorded on SPE: Implications for source models of small, shallow explosions". United States. doi:10.1002/2014JB011773. https://www.osti.gov/servlets/purl/1468564.
@article{osti_1468564,
title = {Seismic source functions from free-field ground motions recorded on SPE: Implications for source models of small, shallow explosions},
author = {Rougier, Esteban and Patton, Howard J.},
abstractNote = {In this, reduced displacement potentials (RDPs) for chemical explosions of the Source Physics Experiments (SPE) in granite at the Nevada Nuclear Security Site are estimated from free-field ground motion recordings. Far-field P wave source functions are proportional to the time derivative of RDPs. Frequency domain comparisons between measured source functions and model predictions show that high-frequency amplitudes roll off as ω-2, but models fail to predict the observed seismic moment, corner frequency, and spectral overshoot. All three features are fit satisfactorily for the SPE-2 test after cavity radius Rc is reduced by 12%, elastic radius is reduced by 58%, and peak-to-static pressure ratio on the elastic radius is increased by 100%, all with respect to the Mueller-Murphy model modified with the Denny-Johnson Rc scaling law. A large discrepancy is found between the cavity volume inferred from RDPs and the volume estimated from laser scans of the emplacement hole. The measurements imply a scaled Rc of ~5 m/kt1/3, more than a factor of 2 smaller than nuclear explosions. Less than 25% of the seismic moment can be attributed to cavity formation. A breakdown of the incompressibility assumption due to shear dilatancy of the source medium around the cavity is the likely explanation. New formulas are developed for volume changes due to medium bulking (or compaction). A 0.04% decrease of average density inside the elastic radius accounts for the missing volumetric moment. Assuming incompressibility, established Rc scaling laws predicted the moment reasonable well, but it was only fortuitous because dilation of the source medium compensated for the small cavity volume.},
doi = {10.1002/2014JB011773},
journal = {Journal of Geophysical Research. Solid Earth},
number = 5,
volume = 120,
place = {United States},
year = {2015},
month = {4}
}

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Works referenced in this record:

An Explosion Model Comparison with Insights from the Source Physics Experiments
journal, September 2013

  • Ford, S. R.; Walter, W. R.
  • Bulletin of the Seismological Society of America, Vol. 103, Issue 5
  • DOI: 10.1785/0120130035

Constraints on burial depth and yield of the 25 May 2009 North Korean test from hydrodynamic simulations in a granite medium: 25 MAY 2009 NORTH KOREAN TEST, DOB AND YIELD
journal, August 2011

  • Rougier, Esteban; Patton, Howard J.; Knight, Earl E.
  • Geophysical Research Letters, Vol. 38, Issue 16
  • DOI: 10.1029/2011GL048269

Modeling Ms-Yield Scaling of Nevada Test Site Nuclear Explosions for Constraints on Volumetric Moment due to Source-Medium Damage
journal, August 2012

  • Patton, H. J.
  • Bulletin of the Seismological Society of America, Vol. 102, Issue 4
  • DOI: 10.1785/0120110302

Advanced Seismic Analyses of the Source Characteristics of the 2006 and 2009 North Korean Nuclear Tests
journal, June 2013

  • Murphy, J. R.; Stevens, J. L.; Kohl, B. C.
  • Bulletin of the Seismological Society of America, Vol. 103, Issue 3
  • DOI: 10.1785/0120120194

The physical basis of m b : M s and variable frequency magnitude methods for earthquake/explosion discrimination
journal, January 1985

  • Stevens, Jeffry L.; Day, Steven M.
  • Journal of Geophysical Research, Vol. 90, Issue B4
  • DOI: 10.1029/JB090iB04p03009

Seismic Source Characteristics of Nuclear and Chemical Explosions in Granite from Hydrodynamic Simulations
journal, November 2012

  • Xu, Heming; Rodgers, Arthur J.; Lomov, Ilya N.
  • Pure and Applied Geophysics, Vol. 171, Issue 3-5
  • DOI: 10.1007/s00024-012-0623-0

Chemical Explosion Experiments to Improve Nuclear Test Monitoring
journal, July 2013

  • Snelson, Catherine M.; Abbott, Robert E.; Broome, Scott T.
  • Eos, Transactions American Geophysical Union, Vol. 94, Issue 27
  • DOI: 10.1002/2013EO270002

Comparison of amplitudes of seismic waves from nuclear explosions in four mediums
journal, March 1963

  • Werth, Glenn C.; Herbst, Roland F.
  • Journal of Geophysical Research, Vol. 68, Issue 5
  • DOI: 10.1029/JZ068i005p01463

Application of Network-averaged Teleseismic P-wave Spectra to Seismic Yield Estimation of Underground Nuclear Explosions
journal, October 2001

  • Murphy, J. R.; Barker, B. W.
  • Pure and Applied Geophysics, Vol. 158, Issue 11
  • DOI: 10.1007/PL00001144

Seismic Source Studies for Chemical Explosions in Granite
journal, December 2013

  • Stroujkova, A.; Morozov, I.
  • Bulletin of the Seismological Society of America, Vol. 104, Issue 1
  • DOI: 10.1785/0120130173

Source Spectral Modeling of Regional P/S Discriminants at Nuclear Test Sites in China and the Former Soviet Union
journal, December 2006

  • Fisk, M. D.
  • Bulletin of the Seismological Society of America, Vol. 96, Issue 6
  • DOI: 10.1785/0120060023