The thickness and structural characteristics of the crust across Tibetan plateau from active-sources seismic profiles

• 来源期刊: 地震学报（英文版）
• 学科: 地球科学
• 年，卷（期）: 2009,（1）
• 页码范围: 21-31
• 页数: 11页
• 分类号: P313.2
• 语种: 英文
• DOI: 10.1007/s11589-009-0021-6

摘要

The Tibetan plateau as one of the youngest orogen on the Earth was considered as the result of conti-nent-continent collision between the Eurasian and Indian plates. The thickness and structure of the crust beneath Tibetan pla-teau is essential to understand deformation behavior of the plateau. Active-source seismic profiling is most available geo-physical method for imaging the structure of the continental crust. The results from more than 25 active-sources seismic pro-files carried out in the past twenty years were reviewed in this article. A preliminary cross crustal pattern of the Tibetan Pla-teau was presented and discussed. The Moho discontinuity buries at the range of 60-80 km on average and have steep ramps located roughly beneath the sutures that are compatible with the successive stacking/accretion of the former Cenozoic blocks northeastward. The deepest Moho (near 80 km) appears closely near IYS and the crustal scale thrust system beneath southern margin of Tibetan plateau suggests strong dependence on collision and non-distributed deformation there. However, the ～20 km order of Moho offsets hardly reappears in the inline section across northern Tibetan plateau. Without a universally