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1、CEJP-D-09-00056SeismicCrystalsAndEarthquakeShieldApplication*B.BaykantALAGÖZSerkanALAGÖZAbstract:Wetheoreticallydemonstratethatearthquakeshieldmadeofseismiccrystalcandampdownsurfacewaves,whicharethemostdestructivetypeforconstructions.Inthepaper,seismiccry
2、stalisintroducedinaspectofbandgaps(Stopband)andsomedesignconceptsforearthquakeandtsunamishieldingwerediscussedintheoreticalmanner.WeobservedinourFDTDbased2Delasticwavesimulationsthatproposedearthquakeshieldcouldprovideabout0.5reductionsinmagnitudeofsurfac
3、ewaveontheRichterscale.Thisreductionrateinmagnitudecanconsiderablyreducedestructionsinthecaseofearthquake.Keyword:Earthquakeshield,seismiccrystals,bandgapPACS:46.40.-f,91.30.-fIntroduction:Fromresearches,doneforphotonicandsoniccrystals,bandgapswereobserve
4、dinthebandstructuresofcrystalswithvariouslatticegeometries.[1-5]Since,crystalstructuresexhibitverylowtransmissionforincomingwaveinfrequenciescoincidingbandgaps,itwasreferredasstopbandinsomestudies.Bandgapsoccurwhenhomogenouswavepropagationmediumturnedinto
5、aninhomogeneousconditionbyperiodicalflawingofscatteringmaterial.Thisperiodicalflawinmediumleadsfrequencyselectivityintransmissionofthewaveandresultstransmissionbands,permittingwavepropagationthroughthecrystal,andbandgaps,prohibitingwavepropagationthrought
6、hecrystal.Practically,bandgapspropertiesofsoniccrystalstructureswereusedinapplicationofreductionofvibrationsorsoundwave.Inthisstudy,weconsidercrystalstructuresforsuspensionofdestructiveseismicwavesfromanearthquakeinatheoreticalmanner.Accordingly,wereferre
7、dthesecrystalsasSeismicCrystalandapplicationofisolatingaregionfromdestructiveseismicwaveasEarthquakeShielding.Sincedifficultiesinexperimentalstudyofearthquakes,weappliedtoFiniteDifferenceTimeDomain(FDTD)simulations,whichwasthemostcommonnumericalanalysiste
8、chniqueusedforelasticoracousticwavesininhomogeneousmaterials.[1,3]Destructivesurfacewavestravelsascompressionanddecompressionofgranularstructure.Inordertomodelthistypeofsurfacewavepropagationmathematically,weusedela
