Preliminary Results of the Earthquake Observation and the Onshore-Offshore Seismic Experiments on Xisha Block
详细信息
- 责任者：Huang Haibo (Key Laboratory of Marginal Sea Geology ; South China Sea Institute of Oceanology ; Chinese Academy of Sciences ; Guangzhou 510301 ; China) ; Qiu Xuelin
- 刊名：Chinese Journal of Geophysics
- 出版年：2011
- 卷期：54(12)
- 关键词：crustal structure ; 地震勘探 ; seismic exploration ; 速度结构 ; velocity structure ; 西沙群岛 ; Xisha Islands
- 页码：p.3161-3170
- 图表：9 illus., 1 table, 27 refs.
- 分类号：0400
- 出版序号：20122212
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
Temporary earthquake stations were installed on islands of Xisha Block and onshore-offshore deep seismic experiment was carried out in order to study the crustal structure beneath Xisha Block. The results show that a 2 km-thick low-velocity sediment exists on the top of (Chenhang Island) CHH which is attributed to Cenozoic deposition.In the lower crust, there exists a prominent Low-Velocity Layer. Moho interface lies at the depth of 24～26 km right beneath CHH. The crustal thickness gradually decreases outward along the onshore-offshore seismic line. The crustal structure has the typical characteristics of rift valley in the NW side of CHH, which belongs to the extension of Xisha Trough.