Brazilian Lithosphere Seismic Project

本研究是利用10-15便携式REFTEK/STS-2地震仪系统对巴西东南部大陆屏蔽区进行成像的宽带地震试验。卡内基研究所将与圣保罗大学和其他巴西机构合作，在巴西东南部部署地震阵列，为期18个月。该构造将通过地震波走时、边界相互作用相波形反演、面波反演和横波分裂技术来确定。该屏蔽区形成并稳定于晚前寒武纪时期，在此期间，不同时代的克拉通块体和微板块的镶嵌拼接形成了冈瓦那超大陆。这项研究的目的是为了加深我们对该盾构的地壳和上地幔演化的了解，特别是与岩石圈厚度有关的问题。

This research is to do a broadband seismic experiment with 10- 15 portable REFTEK/STS-2 seismograph systems to image the continental shield region of SE Brazil. Carnegie Institution, in cooperation with the University of Sao Paulo and other Brazilian institutions, will deploy the seismic array in SE Brazil for a period of 18 months. The structure will be determined by means of seismic wave travel times,wave-form inversion of boundary interaction phases, surface wave inversion and by shear-wave splitting techniques. This shield area was formed and stabilized in late Precambrian time during which a mosaic of heterogeneous cratonic blocks and microplates of varying ages were amalgamated to form the Gondwana supercontinent. The purpose of this study is to increase our understanding of the evolution of the crust and upper mantle of this shield, especially questions related to the thickness of the lithosphere.