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Title: New Source Model for Chemical Explosions

Abstract

With sophisticated inversion scheme, we recover characteristics of SPE explosions such as corner frequency f c and moment M 0, which are used to develop a new source model for chemical explosions.

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 National Nuclear Security Administration (NNSA)
OSTI Identifier:
1345925
Report Number(s):
LA-UR-17-21841
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE

Citation Formats

Yang, Xiaoning. New Source Model for Chemical Explosions. United States: N. p., 2017. Web. doi:10.2172/1345925.
Yang, Xiaoning. New Source Model for Chemical Explosions. United States. doi:10.2172/1345925.
Yang, Xiaoning. Fri . "New Source Model for Chemical Explosions". United States. doi:10.2172/1345925. https://www.osti.gov/servlets/purl/1345925.
@article{osti_1345925,
title = {New Source Model for Chemical Explosions},
author = {Yang, Xiaoning},
abstractNote = {With sophisticated inversion scheme, we recover characteristics of SPE explosions such as corner frequency fc and moment M0, which are used to develop a new source model for chemical explosions.},
doi = {10.2172/1345925},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Mar 03 00:00:00 EST 2017},
month = {Fri Mar 03 00:00:00 EST 2017}
}

Technical Report:

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  • Routine industrial mining explosions play two important roles in seismic nuclear monitoring research: (1) they are a source of background events that need to be discriminated from potential nuclear explosions; (2) as some of the only explosions occurring in the current de facto global moratoria on nuclear testing, their signals should be exploited to improve the calibration of seismic m monitoring systems. A common issue monitoring arising in both of these roles is our limited physical understanding of the causes behind observed differences and similarities in the seismic signals produced by routine industrial mining blasts and small underground nuclear tests.more » In 2003 a consortium (Weston, SMU, LLNL, LANL and UTEP) carried out a Source Phenomenology Experiment (SPE), a series of dedicated explosions designed to improve this physical understanding, particularly as it relates to seismic methods of discriminating between signals from three different source types: earthquakes, industrial blasts, and nuclear tests. Here we very briefly review prior field experimental work that examined the seismic relationships between these source types.« less
  • From the very beginning of its arrangement in 1947, the Institute for Dynamics of the Geospheres RAS (former Special Sector of the Institute for physics of the Earth, RAS) was providing scientific observations of effects of nuclear explosions, as well as large-scale detonations of HE, on environment. This report presents principal results of instrumental observations obtained from various large-scale chemical explosions conducted in the Former-Soviet Union in the period of time from 1957 to 1989. Considering principal aim of the work, tamped and equivalent chemical explosions have been selected with total weights from several hundreds to several thousands ton. Inmore » particular, the selected explosions were aimed to study scaling law from excavation explosions, seismic effect of tamped explosions, and for dam construction for hydropower stations and soil melioration. Instrumental data on surface explosions of total weight in the same range aimed to test military technics and special objects are not included.« less
  • One of the problems associated with monitoring a comprehensive nuclear test ban treaty is that of discrimination between small explosions and earthquakes based on seismic data. Chemical explosions are used routinely in the mining and construction industries in both the United States and the Soviet Union. These chemical explosions usually occur at very shallow depths (a few tens of feet), and probably are all shallower than a few hundred meters. Most nuclear explosions are detonated at depths of less than about one kilometer, and the deepest underground nuclear explosions are a few kilimeters deep. On the other hand, most earthquakesmore » occur deeper in the earth's crust. Thus, accurate estimation of the depths of seismic sources can be helpful in discriminating earthquakes from explosions. During the past several years, the Principal Investigator (PI) for this summer project has been studying the use of short-period Rayleigh waves (Rg) as a depth discriminant for seismic sources in New England.« less
  • Recent advances in the damage mechanics of brittle solids have made is possible to calculate stress-strain curves for the non-linear source regime of underground nuclear explosions where the rock is being actively fractured. It has been shown that the damage-based rheology can explain the anomalously broad source pulses observed in the free field of explosions in granite. It also offers a physical explanation for why such pulse broadening was not observed in laboratory experiments in terms of the scaling of rock strength with the size of preexisting fractures. In this report the authors discuss how damage mechanics may be usedmore » to modify the Mueller-Murphy source model to explicitly include the fracture distribution in the explacement medium thereby providing a physical interpretation of source parameters which specify the width of the pressure pulse at the elastic radius, and the elastic radius itself. These parameters are currently evaluated empirically using calibration shots of known yield for each site. The resultant improvement of our understanding of the relation between the source medium and seismic coupling at high frequencies is especially important in view of the recent trend toward the use of higher frequency regional phases for yield estimation and discrimination allowed by improved seismic accessibility to test sites.« less