Transdimensional Bayesian seismic ambient noise tomography across SE Tibet. (February 2017)

• Record Type: Journal Article
• Authors: Zheng, DingChang; Saygin, Erdinc; Cummins, Phil; Ge, Zengxi; Min, Zhaoxu; Cipta, Athanasius; Yang, Runhai
• Is Part Of: Journal of Asian earth sciences. Volume 134(2017)
• Page Start: 86
• Page End: 93
• Publication Date: 2017-02
• Subjects: Ambient noise tomography -- Transdimensional Bayesian method -- Low-velocity zone -- SE Tibet; Earth sciences -- Asia -- Periodicals; Sciences de la terre -- Asie -- Périodiques; Earth sciences; Asia; Periodicals; 555.05
• DOI: 10.1016/j.jseaes.2016.11.011
• Languages: English
• ISSNs: 1367-9120

Abstract

Graphical abstract: Highlights: An improved phase velocity model is presented across SE Tibet. The pattern of low-velocity zone is more complex than was previously thought. Our new model contributes to the interpretation of the surface deformation. Abstract: We analyze seismic ambient noise data recorded at a set of permanent and temporary stations across southeastern Tibet to image crustal structure. High-resolution phase velocity maps are presented based on Transdimensional Bayesian seismic ambient noise tomography. Seismic images exhibit more apparent horizontal heterogeneities and show more detailed information compared to previous studies based on traditional ambient noise tomography. As noted from the phase velocity image at 25 s, the rigid high velocity anomalies beneath the Sichuan Basin and the South China Fold System act as a blockage to crustal material expansion, and the distribution of velocity anomalies contributes to the interpretation of a surface clockwise rotation pattern. Our results imply a more complex distributed low-velocity zone rather than two isolated channels beneath SE Tibet.