Near Field and Regional Modeling of Explosions at the Degelen Test Site

Stevens, J. L.; Rimer, N.; Xu, H.; Murphy, J. R.; Baker, G. E.; Kocharyan, G. G.; Ivanov, B. A.; Day, S. M.

Near Field and Regional Modeling of Explosions at the Degelen Test Site

Active / Technical Report | Accession Number: ADA529646 |

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Abstract:

The objective of this research program is to improve the capability to predict the seismic source characteristics of underground explosions in rock. This is being accomplished by development of improved dynamic failure models that are constrained by a large unique data set of near-field waveforms and parametric data from both U.S. tests and historic Soviet explosions at the Degelen Test Site. In addition, we are analyzing regional seismic data along a seismic line located north of the Degelen Test Site that recorded data at 9 stations spaced approximately evenly from the test site to a distance of about 100 km. This project is a collaborative effort between SAIC and the Russian Institute for the Dynamics of the Geospheres IDG. IDG is in the process of digitizing data from 25 nuclear tests at Degelen. The complete data set consists of 81 near-field waveforms recorded underground at shot depth and 124 near-regional seismic records. Most seismic records include both a vertical and radial waveform. This data set provides a rare opportunity to observe and model the seismic wavefield of the explosions as they evolve from the near field of the explosion out to regional distances. To date, IDG has digitized 27 near-field waveforms and 122 seismic waveforms. We are in the process of defining the optimum procedures to model this data. The goal is to develop material models that are consistent with the data and have a realistic physical basis. Work to date at SAIC has focused on implementation and testing of improved numerical modeling procedures and simulation of near-regional data. We are testing acoustic fluidization as a physical mechanism for strength reduction in nonlinear explosion simulations. Near regional data is being modeled using wave number integration. We are also comparing the Degelen data with similar data from NTS explosions. The near-field Degelen data received to date is lower in amplitude than would be predicted based on NTS experience. Although both the

Author(s):

Stevens, J. L. ; Rimer, N. ; Xu, H. ; Murphy, J. R. ; Baker, G. E. ; Kocharyan, G. G. ; Ivanov, B. A. ; Day, S. M.

Author Organization(s):

SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA

Descriptive Note:

Conference paper

Supplementary Note:

Proceedings of the 23rd Seismic Research Review: Worldwide Monitoring of Nuclear Explosions held in Jackson Hole, WY on 2-5 of October, 2001. U.S. Government or Federal Rights. The original document contains color images.

Pagination:

0011

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:

Approved For Public Release

Distribution Statement:

Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR

Identifying Numbers

Contract/Grant Number(s):

DTRA01-00-C-0050

Monitor Series:

DTRA/FB

Subject Terms

Joint Capability Areas:

JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_8_Building Partnerships; JCA_1.2_Force Preparation; JCA_1.4.2_Health Service Delivery; JCA_1.4_Force Support; JCA_1_Force Support; JCA_5_Command and Control; JCA_5.3_Planning; JCA_8.2_Shape

Communities of Interest:

Energy and Power Technologies

Descriptor(s):

*ROCK MECHANICS, *UNDERGROUND EXPLOSIONS, *NUCLEAR EXPLOSIONS, SEISMIC DATA, SYMPOSIA, MATHEMATICAL MODELS, WAVEFORMS

Field(s)/Group(s):

Geology, Geochemistry and Mineralogy, Nuclear Explosions and Devices (Non-Military)

Keyword(s):

DEGELEN TEST SITE, NUMERICAL MODELING

Report Date:

2001 Oct 01

Creation Date:

2010 Oct 13