地震三维正演模拟并行计算程序

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  • 2022-06-10 05:16
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地震三维正演模拟并行计算程序,用的是粘弹性波动方程,在linux下运行,需要安装并行环境,比如mpich
fdmpi_v_1.1.rar
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内容介绍
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta charset="utf-8"><meta name="generator" content="pdf2htmlEX"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><link rel="stylesheet" href="https://csdnimg.cn/release/download_crawler_static/css/base.min.css"><link rel="stylesheet" href="https://csdnimg.cn/release/download_crawler_static/css/fancy.min.css"><link rel="stylesheet" href="https://csdnimg.cn/release/download_crawler_static/1645850/raw.css"><script src="https://csdnimg.cn/release/download_crawler_static/js/compatibility.min.js"></script><script src="https://csdnimg.cn/release/download_crawler_static/js/pdf2htmlEX.min.js"></script><script>try{pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({});}catch(e){}</script><title></title></head><body><div id="sidebar" style="display: none"><div id="outline"></div></div><div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://csdnimg.cn/release/download_crawler_static/1645850/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">Computers<span class="_ _0"> </span>&amp;<span class="_ _0"> </span>Geosciences<span class="_ _0"> </span>28<span class="_ _0"> </span>(2002)<span class="_ _0"> </span>887<span class="_ _1"></span>&#8211;<span class="_ _1"></span>899</div><div class="t m0 x2 h3 y2 ff1 fs1 fc0 sc0 ls0 ws0">Parallel<span class="_ _2"> </span>3-D<span class="_ _2"> </span>viscoelastic<span class="_ _2"> </span>&#64257;nite<span class="_ _2"> </span>difference<span class="_ _2"> </span>seismic<span class="_ _2"> </span>modelling</div><div class="t m1 x3 h4 y3 ff2 fs2 fc0 sc0 ls0 ws0">$</div><div class="t m2 x4 h5 y4 ff1 fs3 fc0 sc0 ls0 ws0">Thomas<span class="_ _3"> </span>Bohlen*</div><div class="t m2 x5 h6 y5 ff3 fs0 fc0 sc0 ls0 ws0">Kiel<span class="_ _0"> </span>University,<span class="_ _0"> </span>Institute<span class="_ _0"> </span>of<span class="_ _4"> </span>Geosciences,<span class="_ _0"> </span>Geophysics,<span class="_ _0"> </span>Otto&#8211;Hahn&#8211;Platz<span class="_ _0"> </span>1,<span class="_ _0"> </span>D&#8211;24118<span class="_ _0"> </span>Kiel,<span class="_ _0"> </span>Germany</div><div class="t m2 x6 h2 y6 ff1 fs0 fc0 sc0 ls0 ws0">Received<span class="_ _0"> </span>5<span class="_ _0"> </span>June<span class="_ _0"> </span>2001;<span class="_ _0"> </span>received<span class="_ _0"> </span>in<span class="_ _4"> </span>revised<span class="_ _0"> </span>form<span class="_ _0"> </span>23<span class="_ _4"> </span>November<span class="_ _0"> </span>2001</div><div class="t m2 x7 h7 y7 ff4 fs4 fc0 sc0 ls0 ws0">Abstract</div><div class="t m2 x8 h8 y8 ff1 fs4 fc0 sc0 ls0 ws0">Computational<span class="_ _5"> </span>power<span class="_ _5"> </span>has<span class="_ _5"> </span>advanced<span class="_ _5"> </span>to<span class="_ _5"> </span>a<span class="_ _5"> </span>state<span class="_ _5"> </span>where<span class="_ _5"> </span>we<span class="_ _6"> </span>can<span class="_ _5"> </span>begin<span class="_ _6"> </span>to<span class="_ _5"> </span>perform<span class="_ _5"> </span>wave&#64257;eld<span class="_ _5"> </span>simulations<span class="_ _5"> </span>for<span class="_ _5"> </span>realistic</div><div class="t m2 x7 h8 y9 ff1 fs4 fc0 sc0 ls0 ws0">(complex)<span class="_ _7"> </span>3-D<span class="_ _7"> </span>earth<span class="_ _7"> </span>models<span class="_ _7"> </span>at<span class="_ _7"> </span>frequencies<span class="_ _7"> </span>of<span class="_ _7"> </span>interest<span class="_ _7"> </span>to<span class="_ _7"> </span>both<span class="_ _7"> </span>seismologists<span class="_ _7"> </span>and<span class="_ _7"> </span>engineers.<span class="_ _7"> </span>On<span class="_ _7"> </span>serial<span class="_ _7"> </span>platforms,<span class="_ _7"> </span>however,</div><div class="t m2 x7 h8 ya ff1 fs4 fc0 sc0 ls0 ws0">3-D<span class="_ _0"> </span>calculations<span class="_ _7"> </span>are<span class="_ _0"> </span>still<span class="_ _0"> </span>limited<span class="_ _0"> </span>to<span class="_ _0"> </span>small<span class="_ _7"> </span>grid<span class="_ _0"> </span>sizes<span class="_ _0"> </span>and<span class="_ _0"> </span>short<span class="_ _0"> </span>seismic<span class="_ _0"> </span>wave<span class="_ _7"> </span>traveltimes.<span class="_ _0"> </span>To<span class="_ _0"> </span>make<span class="_ _0"> </span>use<span class="_ _0"> </span>of<span class="_ _7"> </span>the<span class="_ _0"> </span>ef&#64257;ciency<span class="_ _0"> </span>of</div><div class="t m2 x7 h8 yb ff1 fs4 fc0 sc0 ls0 ws0">network<span class="_ _0"> </span>computers<span class="_ _0"> </span>a<span class="_ _7"> </span>parallel<span class="_ _0"> </span>3-D<span class="_ _0"> </span>viscoelastic<span class="_ _0"> </span>&#64257;nite<span class="_ _0"> </span>difference<span class="_ _0"> </span>(FD)<span class="_ _0"> </span>code<span class="_ _0"> </span>is<span class="_ _7"> </span>implemented<span class="_ _0"> </span>which<span class="_ _0"> </span>allows<span class="_ _0"> </span>to<span class="_ _0"> </span>distribute<span class="_ _0"> </span>the</div><div class="t m2 x7 h8 yc ff1 fs4 fc0 sc0 ls0 ws0">work<span class="_ _4"> </span>on<span class="_ _6"> </span>several<span class="_ _6"> </span>PCs<span class="_ _4"> </span>or<span class="_ _6"> </span>workstations<span class="_ _4"> </span>connected<span class="_ _6"> </span>via<span class="_ _4"> </span>standard<span class="_ _6"> </span>ethernet<span class="_ _4"> </span>in<span class="_ _6"> </span>an<span class="_ _4"> </span>in-house<span class="_ _6"> </span>network.<span class="_ _4"> </span>By<span class="_ _6"> </span>using<span class="_ _4"> </span>the<span class="_ _6"> </span>portable</div><div class="t m2 x7 h8 yd ff1 fs4 fc0 sc0 ls0 ws0">message<span class="_ _6"> </span>passing<span class="_ _6"> </span>interface<span class="_ _6"> </span>standard<span class="_ _4"> </span>(MPI)<span class="_ _6"> </span>for<span class="_ _6"> </span>the<span class="_ _6"> </span>communication<span class="_ _6"> </span>between<span class="_ _6"> </span>processors,<span class="_ _8"> </span>running<span class="_ _8"> </span>times<span class="_ _6"> </span>can<span class="_ _6"> </span>be<span class="_ _8"> </span>reduced</div><div class="t m2 x7 h8 ye ff1 fs4 fc0 sc0 ls0 ws0">and<span class="_ _9"> </span>grid<span class="_ _9"> </span>sizes<span class="_ _9"> </span>can<span class="_ _9"> </span>be<span class="_ _9"> </span>increased<span class="_ _9"> </span>signi&#64257;cantly.<span class="_ _9"> </span>Furthermore,<span class="_ _3"> </span>the<span class="_ _9"> </span>code<span class="_ _9"> </span>shows<span class="_ _9"> </span>good<span class="_ _9"> </span>performance<span class="_ _9"> </span>on<span class="_ _9"> </span>massive<span class="_ _9"> </span>parallel</div><div class="t m2 x7 h8 yf ff1 fs4 fc0 sc0 ls0 ws0">supercomputers<span class="_ _6"> </span>which<span class="_ _6"> </span>makes<span class="_ _6"> </span>the<span class="_ _6"> </span>computation<span class="_ _6"> </span>of<span class="_ _6"> </span>very<span class="_ _6"> </span>large<span class="_ _6"> </span>grids<span class="_ _6"> </span>feasible.<span class="_ _6"> </span>This<span class="_ _6"> </span>implementation<span class="_ _5"> </span>greatly<span class="_ _6"> </span>expands<span class="_ _6"> </span>the</div><div class="t m2 x7 h8 y10 ff1 fs4 fc0 sc0 ls0 ws0">applicability<span class="_ _0"> </span>of<span class="_ _0"> </span>the<span class="_ _0"> </span>3-D<span class="_ _0"> </span>elastic/viscoelastic<span class="_ _0"> </span>&#64257;nite-difference<span class="_ _0"> </span>modelling<span class="_ _0"> </span>technique<span class="_ _0"> </span>by<span class="_ _0"> </span>providing<span class="_ _4"> </span>an<span class="_ _0"> </span>ef&#64257;cient,<span class="_ _0"> </span>portable<span class="_ _0"> </span>and</div><div class="t m2 x7 h9 y11 ff1 fs4 fc0 sc0 ls0 ws0">practical<span class="_ _4"> </span>C-program.<span class="_ _8"> </span><span class="ff2">r<span class="_ _8"> </span></span>2002<span class="_ _4"> </span>Elsevier<span class="_ _8"> </span>Science<span class="_ _8"> </span>Ltd.<span class="_ _8"> </span>All<span class="_ _4"> </span>rights<span class="_ _8"> </span>reserved.</div><div class="t m2 x7 h6 y12 ff3 fs0 fc0 sc0 ls0 ws0">Keywords:<span class="_ _5"> </span><span class="ff1">Seismic<span class="_ _7"> </span>wave<span class="_ _7"> </span>attenua<span class="_ _a"></span>tion;<span class="_ _7"> </span>Seismic<span class="_ _b"> </span>wave<span class="_ _b"> </span>dispersion;<span class="_ _9"> </span>Seismic<span class="_ _b"> </span>wave<span class="_ _7"> </span>scattering;<span class="_ _b"> </span>Parallel<span class="_ _7"> </span>computing;<span class="_ _b"> </span>Message<span class="_ _b"> </span>passing<span class="_ _7"> </span>interface</span></div><div class="t m2 x7 h2 y13 ff1 fs0 fc0 sc0 ls0 ws0">(MPI)</div><div class="t m2 x7 h7 y14 ff4 fs4 fc0 sc0 ls0 ws0">1.<span class="_ _3"> </span>Introduction</div><div class="t m2 x8 h8 y15 ff1 fs4 fc0 sc0 ls0 ws0">In<span class="_ _c"> </span>order<span class="_ _c"> </span>to<span class="_ _c"> </span>extract<span class="_ _c"> </span>information<span class="_ _c"> </span>about<span class="_ _c"> </span>the<span class="_ _c"> </span>3-D</div><div class="t m2 x7 h8 y16 ff1 fs4 fc0 sc0 ls0 ws0">structure<span class="_ _d"> </span>and<span class="_ _d"> </span>composition<span class="_ _d"> </span>of<span class="_ _d"> </span>the<span class="_ _d"> </span>crust<span class="_ _d"> </span>from<span class="_ _d"> </span>seismic</div><div class="t m2 x7 h8 y17 ff1 fs4 fc0 sc0 ls0 ws0">observations,<span class="_ _5"> </span>it<span class="_ _5"> </span>is<span class="_ _9"> </span>necessary<span class="_ _5"> </span>to<span class="_ _5"> </span>be<span class="_ _5"> </span>able<span class="_ _9"> </span>to<span class="_ _6"> </span>predict<span class="_ _9"> </span>how</div><div class="t m2 x7 h8 y18 ff1 fs4 fc0 sc0 ls0 ws0">seismic<span class="_ _9"> </span>wave&#64257;elds<span class="_ _3"> </span>are<span class="_ _3"> </span>affected<span class="_ _3"> </span>by<span class="_ _3"> </span>complex<span class="_ _3"> </span>structures.</div><div class="t m2 x7 h8 y19 ff1 fs4 fc0 sc0 ls0 ws0">Since<span class="_ _7"> </span>exact<span class="_ _7"> </span>analytical<span class="_ _7"> </span>solutions<span class="_ _7"> </span>to<span class="_ _7"> </span>the<span class="_ _0"> </span>wave<span class="_ _7"> </span>equations<span class="_ _7"> </span>do</div><div class="t m2 x7 h8 y1a ff1 fs4 fc0 sc0 ls0 ws0">not<span class="_ _e"> </span>exist<span class="_ _e"> </span>for<span class="_ _e"> </span>most<span class="_ _e"> </span>subsurface<span class="_ _e"> </span>con&#64257;gurations,<span class="_ _e"> </span>the</div><div class="t m2 x7 h8 y1b ff1 fs4 fc0 sc0 ls0 ws0">solutions<span class="_ _5"> </span>can<span class="_ _5"> </span>be<span class="_ _5"> </span>obtained<span class="_ _5"> </span>only<span class="_ _5"> </span>by<span class="_ _5"> </span>numerical<span class="_ _9"> </span>methods.</div><div class="t m2 x7 h8 y1c ff1 fs4 fc0 sc0 ls0 ws0">Synthetic<span class="_ _f"> </span>seismograms<span class="_ _f"> </span>are<span class="_ _f"> </span>helpful<span class="_ _f"> </span>in<span class="_ _f"> </span>predicting<span class="_ _f"> </span>and</div><div class="t m2 x7 h8 y1d ff1 fs4 fc0 sc0 ls0 ws0">understanding<span class="_ _4"> </span>the<span class="_ _4"> </span>kinematic<span class="_ _8"> </span>and<span class="_ _8"> </span>dynamic<span class="_ _4"> </span>properties<span class="_ _8"> </span>of</div><div class="t m2 x7 h8 y1e ff1 fs4 fc0 sc0 ls0 ws0">seismic<span class="_ _4"> </span>waves<span class="_ _4"> </span>propagating<span class="_ _4"> </span>through<span class="_ _4"> </span>models<span class="_ _8"> </span>of<span class="_ _4"> </span>the<span class="_ _4"> </span>crust.</div><div class="t m2 x7 h8 y1f ff1 fs4 fc0 sc0 ls0 ws0">With<span class="_ _2"> </span>the<span class="_ _2"> </span>increased<span class="_ _10"> </span>amount<span class="_ _2"> </span>of<span class="_ _2"> </span>detailed<span class="_ _10"> </span>information</div><div class="t m2 x7 h8 y20 ff1 fs4 fc0 sc0 ls0 ws0">required<span class="_ _c"> </span>from<span class="_ _c"> </span>seismic<span class="_ _11"> </span>data,<span class="_ _c"> </span>seismic<span class="_ _11"> </span>modelling<span class="_ _c"> </span>has</div><div class="t m2 x7 h8 y21 ff1 fs4 fc0 sc0 ls0 ws0">become<span class="_ _9"> </span>an<span class="_ _5"> </span>essential<span class="_ _9"> </span>tool<span class="_ _9"> </span>for<span class="_ _5"> </span>the<span class="_ _9"> </span>evaluation<span class="_ _9"> </span>of<span class="_ _5"> </span>seismic</div><div class="t m2 x7 h8 y22 ff1 fs4 fc0 sc0 ls0 ws0">measurements.<span class="_ _2"> </span>It<span class="_ _2"> </span>helps<span class="_ _2"> </span>in<span class="_ _2"> </span>every<span class="_ _2"> </span>stage<span class="_ _2"> </span>of<span class="_ _2"> </span>a<span class="_ _2"> </span>seismic</div><div class="t m2 x7 h8 y23 ff1 fs4 fc0 sc0 ls0 ws0">investigation.<span class="_ _9"> </span>It<span class="_ _9"> </span>can<span class="_ _5"> </span>help<span class="_ _9"> </span>determine<span class="_ _9"> </span>optimal<span class="_ _9"> </span>recording</div><div class="t m2 x9 h8 y24 ff1 fs4 fc0 sc0 ls0 ws0">parameters<span class="_ _7"> </span>in<span class="_ _7"> </span>data<span class="_ _0"> </span>acquisition.<span class="_ _7"> </span>Synthetic<span class="_ _7"> </span>datasets<span class="_ _7"> </span>can<span class="_ _7"> </span>be</div><div class="t m2 x9 h8 y25 ff1 fs4 fc0 sc0 ls0 ws0">computed<span class="_ _9"> </span>to<span class="_ _9"> </span>test<span class="_ _9"> </span>processing<span class="_ _3"> </span>procedures.<span class="_ _9"> </span>The<span class="_ _9"> </span>compar-</div><div class="t m2 x9 h8 y26 ff1 fs4 fc0 sc0 ls0 ws0">ison<span class="_ _0"> </span>of<span class="_ _4"> </span>synthetic<span class="_ _0"> </span>and<span class="_ _0"> </span>&#64257;eld<span class="_ _4"> </span>seismograms<span class="_ _0"> </span>leads<span class="_ _4"> </span>to<span class="_ _0"> </span>a<span class="_ _4"> </span>better</div><div class="t m2 x9 h8 y27 ff1 fs4 fc0 sc0 ls0 ws0">understanding<span class="_ _6"> </span>of<span class="_ _6"> </span>seismic<span class="_ _5"> </span>measurements<span class="_ _6"> </span>and<span class="_ _5"> </span>thus,<span class="_ _6"> </span>&#64257;ner</div><div class="t m2 x9 h8 y28 ff1 fs4 fc0 sc0 ls0 ws0">details<span class="_ _0"> </span>can<span class="_ _0"> </span>be<span class="_ _0"> </span>extracted<span class="_ _0"> </span>from<span class="_ _0"> </span>seismic<span class="_ _0"> </span>&#64257;eld<span class="_ _0"> </span>recordings.<span class="_ _0"> </span>In</div><div class="t m2 x9 h8 y29 ff1 fs4 fc0 sc0 ls0 ws0">seismic<span class="_ _8"> </span>inversion<span class="_ _8"> </span>procedures,<span class="_ _8"> </span>modelling<span class="_ _8"> </span>is<span class="_ _8"> </span>the<span class="_ _8"> </span>kernel<span class="_ _8"> </span>of</div><div class="t m2 x9 h8 y2a ff1 fs4 fc0 sc0 ls0 ws0">the<span class="_ _4"> </span>inversion<span class="_ _8"> </span>process.</div><div class="t m2 xa h8 y2b ff1 fs4 fc0 sc0 ls0 ws0">Various<span class="_ _f"> </span>techniques<span class="_ _f"> </span>for<span class="_ _f"> </span>seismic<span class="_ _2"> </span>wave<span class="_ _f"> </span>modelling<span class="_ _f"> </span>in</div><div class="t m2 x9 h8 y2c ff1 fs4 fc0 sc0 ls0 ws0">realistic<span class="_ _d"> </span>(complex)<span class="_ _d"> </span>media<span class="_ _12"> </span>have<span class="_ _12"> </span>been<span class="_ _12"> </span>developed.<span class="_ _d"> </span>Such</div><div class="t m2 x9 h8 y2d ff1 fs4 fc0 sc0 ls0 ws0">methods<span class="_ _e"> </span>include<span class="_ _13"> </span>wavenumber<span class="_ _13"> </span>integration,<span class="_ _e"> </span>e.g.<span class="_ _13"> </span>the</div><div class="t m2 x9 h8 y2e ff1 fs4 fc0 sc0 ls0 ws0">Re&#64258;ectivity<span class="_ _14"> </span>method<span class="_ _14"> </span>(M<span class="_ _15"></span><span class="ff5">.<span class="_ _16"></span><span class="ff1">uller,<span class="_ _14"> </span>1985),<span class="_ _14"> </span>Ray-tracing</span></span></div><div class="t m2 x9 h8 y2f ff1 fs4 fc0 sc0 ls0 ws0">(</div><div class="t m2 xb ha y30 ff5 fs4 fc0 sc0 ls0 ws0">$</div><div class="t m2 xc h8 y2f ff1 fs4 fc0 sc0 ls0 ws0">Cerven</div><div class="t m2 xd ha y31 ff5 fs4 fc0 sc0 ls0 ws0">!</div><div class="t m2 xe h8 y2f ff1 fs4 fc0 sc0 ls0 ws0">y<span class="_ _f"> </span>et<span class="_ _f"> </span>al.,<span class="_ _f"> </span>1977),<span class="_ _f"> </span>&#64257;nite<span class="_ _d"> </span>elements<span class="_ _f"> </span>(Chen,<span class="_ _f"> </span>1984),</div><div class="t m2 x9 h8 y32 ff1 fs4 fc0 sc0 ls0 ws0">Fourier<span class="_ _0"> </span>or<span class="_ _7"> </span>pseudospectral<span class="_ _7"> </span>methods<span class="_ _0"> </span>(Kosloff<span class="_ _7"> </span>and<span class="_ _0"> </span>Baysal,</div><div class="t m2 x9 h8 y33 ff1 fs4 fc0 sc0 ls0 ws0">1982),<span class="_ _f"> </span>hybrid<span class="_ _f"> </span>methods<span class="_ _f"> </span>(Emmerich,<span class="_ _f"> </span>1992),<span class="_ _f"> </span>and<span class="_ _f"> </span>&#64257;nite</div><div class="t m2 x9 h8 y34 ff1 fs4 fc0 sc0 ls0 ws0">differences<span class="_ _d"> </span>(FD)<span class="_ _d"> </span>(Alterman<span class="_ _f"> </span>and<span class="_ _12"> </span>Karal,<span class="_ _f"> </span>1968;<span class="_ _d"> </span>Alford</div><div class="t m2 x9 h8 y35 ff1 fs4 fc0 sc0 ls0 ws0">et<span class="_ _4"> </span>al.,<span class="_ _8"> </span>1974;<span class="_ _8"> </span>Kelly<span class="_ _8"> </span>et<span class="_ _4"> </span>al.,<span class="_ _8"> </span>1976).</div><div class="t m2 xa h8 y36 ff1 fs4 fc0 sc0 ls0 ws0">Explicit<span class="_ _3"> </span>&#64257;nite<span class="_ _12"> </span>difference<span class="_ _3"> </span>methods<span class="_ _12"> </span>have<span class="_ _3"> </span>been<span class="_ _12"> </span>widely</div><div class="t m2 x9 hb y37 ff1 fs4 fc0 sc0 ls0 ws0">used<span class="_ _6"> </span>to<span class="_ _6"> </span>model<span class="_ _6"> </span>seismic<span class="_ _5"> </span>wave<span class="_ _6"> </span>propagation<span class="_ _6"> </span>in<span class="_ _6"> </span>2-D<span class="_ _6"> </span><span class="ff3">elastic</span></div><div class="t m2 x9 h8 y38 ff1 fs4 fc0 sc0 ls0 ws0">media,<span class="_ _2"> </span>because<span class="_ _f"> </span>of<span class="_ _2"> </span>their<span class="_ _2"> </span>ability<span class="_ _2"> </span>to<span class="_ _2"> </span>accurately<span class="_ _f"> </span>model</div><div class="t m2 x9 h8 y39 ff1 fs4 fc0 sc0 ls0 ws0">seismic<span class="_ _5"> </span>waves<span class="_ _9"> </span>in<span class="_ _5"> </span>arbitrary<span class="_ _9"> </span>heterogeneous<span class="_ _5"> </span>media.<span class="_ _9"> </span>Kelly</div><div class="t m2 x9 h8 y3a ff1 fs4 fc0 sc0 ls0 ws0">et<span class="_ _f"> </span>al.<span class="_ _2"> </span>(1976)<span class="_ _f"> </span>and<span class="_ _2"> </span>Kelly<span class="_ _2"> </span>(1983)<span class="_ _f"> </span>used<span class="_ _2"> </span>a<span class="_ _f"> </span>displacement</div><div class="t m2 x9 h8 y3b ff1 fs4 fc0 sc0 ls0 ws0">formulation<span class="_ _f"> </span>developed<span class="_ _f"> </span>from<span class="_ _f"> </span>the<span class="_ _f"> </span>second-order<span class="_ _f"> </span>elastic</div><div class="t m3 xf hc y3c ff2 fs5 fc0 sc0 ls0 ws0">$</div><div class="t m0 x10 h2 y3d ff1 fs0 fc0 sc0 ls0 ws0">Code<span class="_ _7"> </span>available<span class="_ _7"> </span>at:<span class="_ _7"> </span>http://www.geophysik.uni-kiel.de/~tbo<span class="_ _a"></span>h-</div><div class="t m0 x7 h2 y3e ff1 fs0 fc0 sc0 ls0 ws0">len/fdmpi<span class="_ _0"> </span>or<span class="_ _0"> </span>at<span class="_ _0"> </span>http://www.iamg.org/CGEditor/index.htm.</div><div class="t m0 x11 h2 y3f ff1 fs0 fc0 sc0 ls0 ws0">*Tel.:<span class="_ _0"> </span>+49-431-880-4648;<span class="_ _0"> </span>fax:<span class="_ _0"> </span>+49-431-880-4432.</div><div class="t m0 x12 h2 y40 ff6 fs0 fc0 sc0 ls0 ws0">E-mail<span class="_ _7"> </span>address:<span class="_ _7"> </span><span class="ff1">tbohlen@geophysik.uni-kiel.de<span class="_ _b"> </span>(T.<span class="_ _0"> </span>Bohlen).</span></div><div class="t m0 x7 hd y41 ff1 fs0 fc0 sc0 ls0 ws0">0098-3004/02/$<span class="_ _17"> </span>-<span class="_ _17"> </span>see<span class="_ _4"> </span>front<span class="_ _0"> </span>matter<span class="_ _0"> </span><span class="ff2">r<span class="_ _0"> </span></span>2002<span class="_ _0"> </span>Elsevier<span class="_ _4"> </span>Science<span class="_ _0"> </span>Ltd.<span class="_ _0"> </span>All<span class="_ _4"> </span>rights<span class="_ _0"> </span>reserved.</div><div class="t m0 x7 h2 y42 ff1 fs0 fc0 sc0 ls0 ws0">PII:<span class="_ _0"> </span>S<span class="_ _b"> </span><span class="ls1">0098-3004(02)00006-7</span></div></div><div class="pi" data-data='{"ctm":[1.764706,0.000000,0.000000,1.764706,0.000000,0.000000]}'></div></div></body></html>
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