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Title: ELASTI

Abstract

The mathematical underpinning of algorithm ELASTI is the so-called velocity-stress system of coupled partial differential equations governing linear (i.e., infinitesimal deformation) seismic wave propagation within a three-dimensional isotropic elastic body The medium is characterized by the three parameters: compressional (P) wave speed, shear (S) wave speed, and mass density, all of which may vary in the three spatial dimensions. The nine dependent variables (three particle velocity vector components and six stress tensor components) are stored within the algorithm on staggered spatial and temporal grids. The 3D spatial grid is rectangular, and grid intervals are uniform in each coordinate direction. Numerical solution methodology consists of explicit, time-domain, finite-differencing. Discrete finite-difference (FD) operators approximating partial derivatives possess 2nd-order accuracy in time and 4th-order accuracy in space. FD formulae for updating the wavefield variables are appropriately non-dimensionalized and normalized so that single-precision arithmetic calculations yield 1105824/01 adequate accuracy. This software will be used to generate seismic responses for typical geological/geophysical models of interest in the petroleum, mining, geotechnical, geothermal, hydrological, environmental assessment, and underground storage industries. Additionally, US government agencies (including the military) involved in monitoring of explosions or remote surveillance of underground facilities.

Authors:
; ;
Publication Date:
Research Org.:
Sandia National Laboratories
Sponsoring Org.:
USDOE
OSTI Identifier:
1324438
Report Number(s):
ELASTI v.4.5; 002736WKSTN00
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Software
Software Revision:
00
Software Package Number:
002736
Software Package Contents:
Media Directory; Software Abstract; Media includes Source Code; / 1 CD-ROM
Software CPU:
WKSTN
Source Code Available:
Yes
Other Software Info:
Algorithm ELASTI is designed to simulate propagation of seismic waves within a three-dimensional (3D) isotropic and heterogeneous linearly elastic medium. The numerical solution methodology is explicit, time-domain, finite-differencing of the velocity-stress partial differential system on staggered spatial and temporal grids. All of the common seismological wave types (i.e., compressional and shear body waves, reflections, refractions, mode-conversions, multiples, surface and interface waves, etc.) are generated with fidelity, provided spatial and temporal grid intervals are sufficiently fine. A variety of realistic seismic energy sources and receivers are implemented within the algorithm.
Related Software:
ILAYRS 1D, RECORD
Country of Publication:
United States

Citation Formats

Aldridge, David F, Preston, Leiph, and Symons, Neill P. ELASTI. Computer software. Vers. 00. USDOE. 13 Sep. 2011. Web.
Aldridge, David F, Preston, Leiph, & Symons, Neill P. (2011, September 13). ELASTI (Version 00) [Computer software].
Aldridge, David F, Preston, Leiph, and Symons, Neill P. ELASTI. Computer software. Version 00. September 13, 2011.
@misc{osti_1324438,
title = {ELASTI, Version 00},
author = {Aldridge, David F and Preston, Leiph and Symons, Neill P.},
abstractNote = {The mathematical underpinning of algorithm ELASTI is the so-called velocity-stress system of coupled partial differential equations governing linear (i.e., infinitesimal deformation) seismic wave propagation within a three-dimensional isotropic elastic body The medium is characterized by the three parameters: compressional (P) wave speed, shear (S) wave speed, and mass density, all of which may vary in the three spatial dimensions. The nine dependent variables (three particle velocity vector components and six stress tensor components) are stored within the algorithm on staggered spatial and temporal grids. The 3D spatial grid is rectangular, and grid intervals are uniform in each coordinate direction. Numerical solution methodology consists of explicit, time-domain, finite-differencing. Discrete finite-difference (FD) operators approximating partial derivatives possess 2nd-order accuracy in time and 4th-order accuracy in space. FD formulae for updating the wavefield variables are appropriately non-dimensionalized and normalized so that single-precision arithmetic calculations yield 1105824/01 adequate accuracy. This software will be used to generate seismic responses for typical geological/geophysical models of interest in the petroleum, mining, geotechnical, geothermal, hydrological, environmental assessment, and underground storage industries. Additionally, US government agencies (including the military) involved in monitoring of explosions or remote surveillance of underground facilities.},
doi = {},
year = {2011},
month = {9},
note =
}

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