Seismological Evidence for the Existence of the Low-Velocity Body in Northern Tibet : A Result from INDEPTH-IV Based Broad-Band Seismological Study
详细信息
- 责任者：Xue Guangqi (Institute of Mineral Resources ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Zhao Wenjin
- 刊名：Acta Geoscientica Sinica
- 出版年：2011
- 卷期：32(3)
- 关键词：低速带 ; low-velocity zones ; 深地震测深 ; deep seismic sounding ; 西藏 ; Tibet
- 页码：p.331-335
- 图表：5 illus., 11 refs.
- 分类号：0400
- 出版序号：745
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
The INDEPTH-IV seismic profile, located in northeastern Qinghai-Tibetan Plateau, starts at the north end of Qaidam Basin, extends across East Kunlun Fault Zone, Jinsha Suture, and ends at Qiangtang Terrain. The authors implemented a 3D travel-time residual reversion using body-wave from the natural earthquake, and outlined the pattern of the deep-seated structure underneath the northeast part of the Qinghai-Tibetan Plateau. The result obviously indicates that the South Kunlun Fault, Central Kunlun Fault and Jinshajiang Fault are all southward thrusting. It is then presumed that the upper-mantle beneath the Qaidam Basin is rigid, where there is no exchange of hot material.