简介：InseismichazardanalysisofnuclearpowerplantofChinathereisaneedtoidentifybothseismogenicstructuresandseismotectoniczones.Inpastpractice,theidentificationoftheseismogenicstructureswasoftenbasedonthesurfaceactivefaultsandcharacterizationoflinearseismicsource.Inasituationwhichshowsquitestrongnon-randomseismicactivityandlackssurfaceactivefaults,itisdifficulttoevaluatetheseismichazardreasonably.TakingseismogenicstructuresintheDayao-Yao’anareaasacasestudyinthispaper,wediscusstheneedandthepossibilitytoapplytheplanarseismogenicstructuretotheseismotectonicmethod.Wesuggestthattheplanarseismogenicstructureshouldbeconsideredwhenapplyingtheseismotectonicmethodtotheseismicriskassessmentofnuclearengineeringinfuture.

简介：Inhighlypopulatedurbancenters,traditionalseismicsurveysourcescannolongerbeproperlyappliedduetorestrictionsinmoderncivilianlifestyles.Theambientvibrationnoise,includingbothmicroseismsandmicrotremor,thougharegenerallyweakbutavailableanywhereandanytime,canbeanidealsupplementarysourceforconductingseismicsurveysforengineeringseismologyandearthquakeengineering.Thisisfundamentallysupportedbyadvanceddigitalsignalprocessingtechniquesforeffectivelyextractingtheusefulinformationoutfromthenoise.Thus,itcanbeessentiallyregardedasapassiveseismicmethod.Inthispaperwefirstmakeabriefsurveyoftheambientvibrationnoise,followedbyaquicksummaryofdigitalsignalprocessingforpassiveseismicsurveys.ThentheapplicationsofambientnoiseinengineeringseismologyandearthquakeengineeringforurbansettingsareillustratedwithexamplesfromBeijingmetropolitanarea.Forengineeringseismologytheexampleistheassessmentofsiteeffectinalargeareaviamicrotremorobservations.Forearthquakeengineeringtheexampleisforstructuralcharacterizationofatypicalreinforcedconcretehigh-risebuildingusingbackgroundvibrationnoise.Byshowingtheseexampleswearguethattheambientnoisecanbetreatedasanewsourcethatiseconomical,practical,andparticularlyvaluabletoengineeringseismologyandearthquakeengineeringprojectsforseismichazardmitigationinurbanareas.