| Title | Crustal radial anisotropy in Northeast China and its implications for the regional tectonic extension |
| Authors | Guo, Zhen Yang, Yingjie Chen, Y. John |
| Affiliation | Macquarie Univ, Dept Earth & Planetary Sci, GEMOC ARC Natl Key Ctr, CCFS, N Ryde, NSW 2109, Australia. Peking Univ, Inst Theoret & Appl Geophys, Sch Earth & Space Sci, Beijing 100871, Peoples R China. South Univ Sci & Technol China, Sch Oceanog, Shenzhen 518055, Peoples R China. |
| Keywords | Surface waves and free oscillations Seismic anisotropy Seismic tomography AMBIENT NOISE TOMOGRAPHY NE CHINA LITHOSPHERIC STRUCTURE CONTINENTAL-CRUST SUBDUCTING SLABS SEISMIC EVIDENCE WAVE TOMOGRAPHY SONGLIAO BASIN EASTERN CHINA MANTLE |
| Issue Date | 2016 |
| Publisher | GEOPHYSICAL JOURNAL INTERNATIONAL |
| Citation | GEOPHYSICAL JOURNAL INTERNATIONAL.2016,207(1),197-208. |
| Abstract | We obtain high-resolution Rayleigh and Love wave phase velocity maps from ambient noise tomography using data recorded by NECESSArray in Northeast China. The resulting radial anisotropic model from the joint inversion of Rayleigh and Love wave dispersion curves reveals strong relationship between the crustal radial anisotropy and tectonic provinces, that is, strong positive anisotropy (V-sh > V-sv) beneath the Songliao Basin and weak radial anisotropy beneath the Xinmeng Belt and Changbaishan Region. The Songliao Basin experienced widespread crustal extension during the late Mesozoic. We interpret the lower crustal anisotropy beneath the Songliao Basin as a result of ductile deformation during the rifting stage, which may lead to the alignment of anisotropic minerals and the observed strong radial anisotropy at present. In the northern Songliao Basin, where thick syn-rift and post-rift sediments (>= 4 km) are believed to be present, we observe a broader lateral distribution of anisotropy with stronger amplitude compared with the southern basin. We suggest that the broader distribution of crustal radial anisotropy in the northern basin could be the consequence of outward lower crustal flow driven by the sedimentary loading during the post-rift stage, which is also proposed by previous numerical modeling. |
| URI | http://hdl.handle.net/20.500.11897/450041 |
| ISSN | 0956-540X |
| DOI | 10.1093/gji/ggw261 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 地球与空间科学学院 |
