简介:OnNovember13,2016,anMW7.8earthquakestruckKaikourainSouthIslandofNewZealand.Bymeansofback-projectionofarrayrecordings,ASTFs-analysisofglobalseismicrecordings,andjointinversionofglobalseismicdataandco-seismicInSARdata,weinvestigatedcomplexityoftheearthquakesource.Theresultshowsthatthe2016MW7.8Kaikouraearthquakerupturedabout100sunilaterallyfromsouthtonortheast(~N28°–33°E),producingaruptureareaabout160kmlongandabout50kmwideandreleasingscalarmoment1.01×1021Nm.Inparticular,theruptureareaconsistedoftwoslipasperities,withoneclosetotheinitialrupturepointhavingamaximalslipvalue~6.9mwhiletheotherfarawayinthenortheasthavingamaximalslipvalue~9.3m.Thefirstasperityslippedforabout65sandthesecondonestarted40safterthefirstonehadinitiated.Thetwoslippedsimultaneouslyforabout25s.Furthermore,thefirsthadanearlythrustslipwhilethesecondhadboththrustandstrikeslip.Itisinterestingthattherupturevelocitywasnotconstant,andthewholeprocessmaybedividedinto5stagesinwhichthevelocitieswereestimatedtobe1.4km/s,0km/s,2.1km/s,0km/sand1.1km/s,respectively.Thehigh-frequencysourcesdistributednearlyalongtheloweredgeoftherupturearea,thehighfrequencyradiatingmainlyoccurredatlaunchingoftheasperities,anditseemedthatnohigh-frequencyenergywasradiatedwhentherupturingwasgoingtostop.
简介:摘要编译原理课程一直以来是计算机本科学生的专业必修课,实践教学环节是本科专业课程锻炼学生动手能力的主要途径,通过实践教学的培养可以加强学生对理论知识的理解,并极大的提高学生的动手能力。但是,就目前本科高校对编译原理课程安排的内容来看,大部分学校的实践内容较落后,甚至还有一部分高校没有安排编译原理的实践课。本文主要针对编译原理课程实践教学中存在的问题,提出具体建议和相关改进措施。