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Title: Reflection processing of the large-N seismic data from the Source Physics Experiment (SPE)

Abstract

The purpose of the SPE is to develop a more physics-based model for nuclear explosion identification to understand the development of S-waves from explosion sources in order to enhance nuclear test ban treaty monitoring.

Authors:
 [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
OSTI Identifier:
1291181
Report Number(s):
LA-UR-16-25181
TRN: US1601700
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; NUCLEAR EXPLOSION DETECTION; SEISMIC S WAVES; PROCESSING; REFLECTION; MONITORING; TREATIES

Citation Formats

Paschall, Olivia C. Reflection processing of the large-N seismic data from the Source Physics Experiment (SPE). United States: N. p., 2016. Web. doi:10.2172/1291181.
Paschall, Olivia C. Reflection processing of the large-N seismic data from the Source Physics Experiment (SPE). United States. doi:10.2172/1291181.
Paschall, Olivia C. 2016. "Reflection processing of the large-N seismic data from the Source Physics Experiment (SPE)". United States. doi:10.2172/1291181. https://www.osti.gov/servlets/purl/1291181.
@article{osti_1291181,
title = {Reflection processing of the large-N seismic data from the Source Physics Experiment (SPE)},
author = {Paschall, Olivia C.},
abstractNote = {The purpose of the SPE is to develop a more physics-based model for nuclear explosion identification to understand the development of S-waves from explosion sources in order to enhance nuclear test ban treaty monitoring.},
doi = {10.2172/1291181},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 7
}

Technical Report:

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  • The authors consider plane-wave motion at normal incidence in a horizontal layered system. The system is assumed lossless, and only the compressional waves are treated. A procedure is introduced for determining the reflection coefficients of the layered system when the observed seismic data may contain random noise. No deconvolution of the measured seismic data is required by the procedure when the input is a narrow wavelength. (Author)
  • A dataset of regional seismograms assembled for a series of Integrated Verification Experiments conducted by the Los Alamos National Laboratory Source Region program is described. The seismic data has been assembled from networks operated by Lawrence Livermore National Laboratory and Sandia National Laboratory. Examples of the data are shown and basic recording characteristics of the network are described. The seismograms are available on a data tape in SAC format upon request.
  • The following is primarily a review of 'Analysis and Simulation of Near-Field Wave Motion Data from the Source Physics Experiment Explosions,' Antoun, et al, published by Lawrence Livermore National Laboratory (LLNL) after SPE-1 in 2011 (Ref. 1). However, LLNL analysis of SPE-2 (Ref. 2) will also be discussed. A review by Los Alamos National Laboratory (LANL) personnel of Reference 1 finds both the evidence of the effects of joints on the data and the correlation of calculations with the data weak. This conclusion is made on three separate levels: (1) Fundamental observations made of the various referenced figures taken asmore » presented; (2) Observations made following corrections to errors and omissions to the selected data; and (3) Observations made after considering likely errors in the raw data set. The evidence presented in the referenced papers relies on subjective interpretation of various figures. This is the nature of this technical field of study and, indeed, much of our observation is also subjective.« less
  • An objective of the Source Physics Experiment (SPE) is to identify low-yield nuclear explosions from a regional distance. Low-yield nuclear explosions can often be difficult to discriminate among the clutter of natural and man-made explosive events (e.g., earthquakes and mine blasts). The SPE is broken into three phases. Phase I has provided the first of the physics-based data to test the empirical models that have been used to discriminate nuclear events. The Phase I series of tests were placed within a highly fractured granite body. The evolution of the project has led to development of Phase II, to be placedmore » within the opposite end member of geology, an alluvium environment, thereby increasing the database of waveforms to build upon in the discrimination models. Both the granite and alluvium sites have hosted nearby nuclear tests, which provide comparisons for the chemical test data. Phase III of the SPE is yet to be determined.« less
  • The purpose if this study was to process and interpret a seismic reflection line from Bland County, Virginia, and to compare it to an earlier line in this location. A longer Vibroseis sweep with greater bandwidth was used for the new line, which provided a considerable improvement in signal to noise ratio and resulted in better residual statics. Additional processing steps, including crooked line CDP sort and predictive deconvolution, also led to improved resolution, particularly in the shallow section. The geologic section interpreted from the seismic profile represents a series of fault slices between the St. Clair Narrows thrust platesmore » above autochthonous Lower Cambrian shelf strata. A previously interpreted Eocambrian rift basin is clearly defined on this line; the basin is bounded by a large normal fault at its north end. Seismicity in Bland and Giles counties may originate in reactivated Eocambrian faults which presumably formed during opening of the Proto-Atlantic Ocean. 23 refs., 13 figs.« less