简介：AfterthereleaseofthepreviousreporttotheCommitteeonSpaceResearch(COSPAR)onprogressachievedbyChinesescientistsinionosphericresearches(LiuLBandWanWX,2016),intherecenttwoyears(2016–2017)manyinterestingnewinvestigationsintovariousionosphericrelatedissueshavebeencompleted.Inthisreport,about100publicationsaresummarized.Thetopicshighlightedareasfollows:Ionosphericspaceweather,ionosphericdynamics,ionosphericclimatologyandmodelling,ionosphericirregularityandscintillation,GlobalNavigationSatelliteSystem(GNSS)relatedionosphericissuesandothertechniques,andradiowavepropagationintheionosphere.AnoutstandingfeatureisthatmoreandmoreobservationsfromtheMeridionalProjectsupportedtheionosphericinvestigations.

简介：The13November2016KaikouraearthquakeoccurredinthenortheasterncoastalregionoftheSouthIsland,NewZealand.TheMw7.8mainshockgeneratedacomplexpatternofsurfaceruptures,andwasfollowedwithinabout12hoursbythreemoderateshocksofMw≥6.0.HereweuseteleseismicwaveformstoinvertforthesourceruptureoftheKaikouraearthquake.Theresultingslip-distributionmodelexhibitsinsignificantslipnearthehypocenterandthreepocketsofmajorslipzoneswithdistinctsensesofmotion.Themainshockstartedfromarupturenearthehypocenter,grewintothrustonshallowcrustalfaults~50kmnortheastofthehypocenter,andthendevelopedintotwoslipzones:adeeperonewithobliquethrustandashalloweronewithalmostpurelyright-lateralstrike-slip.Locationsofthethrustandstrike-slipmotionsintheslip-distributionmodelagreewellwithreportedcoastalupliftsandhorizontaloffsets.Theoverallslippatternisdominatedbyhorizontalmotion,especiallyatshallowdepth,duetothepartitioningofthrustandstrike-slipmotionsabovethesubductionzonemegathrust.Aftershockdistributionsuggeststhatmostaftershockstendtooccurneartheedgesofthemajorslipzonesofthemainshock.Thisobservationonaftershocklocationsmayprovideusefulinformationforseismichazardassessmentsafterlargeearthquakes.

简介：At12:07UT(8:07pmChinaStandardTime)on2017Oct4,abrightbolidewaswidelyobservedintheShangri-LaregionoftheProvinceofYunnan,China(Figure1).TheeventwaswellobservedbythegeneralpublicasittookplaceonthenightoftheMidAutumnFestival,whichisassociatedwithmoongazing.SonicboomsandgroundshakingwerereportedinanareaofaboutathousandsquarekilometersnorthwestofShangri-LaCity.DatafromU.S.governmentsensorssuggeststhattheimpactenergyoftheeventwasapproximately0.54ktTNTequivalent,withtheterminusofthebolidepositionedat28.1°N,99.4°E.ThisisthelargestobservedbolideeventoverlandsincethebolideeventthattookplaceinMauritaniaon2016Jun27(1.2kt).

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.