摘要
Onthebasisofaone-by-onelatitude-longitudegridthree-dimensionalseismicvelocitymodel,thecrustalPwavevelocitystructureineasternChina(105-125°Eand18-41°N)isobtained,andasetofgeothermsforeachgridisestablishedforP-TcorrectiononP-wavevelocities.Theaveragedepthsofsub-crustallayersandtheiraverageP-wavevelocitiesof18tectonicunitsineasternChinaareexhibited.Ourresultpresentsa32-34kmthickcrustbeneatheasternChina,whichisthinnerthanpreviousstudies,withanaveragevelocityof6.54km/s,correspondingtoa5kg/m3variationincrustalmeandensity.ThethickerupperbutthinnermiddleandlowercrustresultsinaloweraverageseismicvelocityofeasternChina.AnintermediatecrustalcompositionwithaSiO2contentof59.7wt%hasbeenestimated.However,thereexistsasignificantlateralvariationinthecrustalstructuresamongthetectonicunitsofeasternChina.ThestructureandcompositionfeaturesofsomeregionsineasternChinaindicatethatextensionhasplayedanimportantroleinthecontinentalcrustevolutionofeasternChina.
出版日期
2004年01月11日（中国期刊网平台首次上网日期，不代表论文的发表时间）
