摘要
本文介绍了１９９０年期间在天水地区的重力剖面测量结果，以及用多层变密度直接反演法得到的该区地壳密度分层结构。结果表明，除近地在的沉积层外，该区地壳在纵向上可分为上、中、下三层，其各层的平均密度为２．６１、２．６６、２．８０ｇ／ｃｍ￣３，各层底面的平均深度分别为１６、２８、４５ｋｍ，且各层在横向和纵向上变化都比较剧烈。
In this paper, the gravity promesurvey in the Tinnshui area in 1990 is introduced.Thesurveying results are calculated by direct inversion method of varinble densities.In the area,thecrustal struCture, besides the sedimentary tayers near surface,includes three layers,i.e. the up-per,miudle and lower crusts with the average densities of 2.61,2.66 and 2.80 g/cm￣3, respec- tively.The average bottom depths are 16, 28 and 45 km respectively,and the layers have con-siderable variations in both lateral and vertical directions.
出处
《西北地震学报》
CSCD
1995年第1期36-42,共7页
Northwestern Seismological Journal
关键词
甘肃
重力测量
地壳结构
Gansu,Crustal structure,Gravity survey,Density-interface inversion
