Open AccessSurface wave tomography of China from ambient seismic noise correlation
Author(s) -
Zheng Sihua,
Sun Xinlei,
Song Xiaodong,
Yang Yingjie,
Ritzwoller Michael H.
Publication year - 2008
Publication title -
geochemistry, geophysics, geosystems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.928
H-Index - 136
ISSN - 1525-2027
DOI - 10.1029/2008gc001981
Subject(s) - geology , rayleigh wave , seismology , seismic noise , ambient noise level , tomography , waveform , group velocity , noise (video) , surface wave , dispersion (optics) , seismic tomography , rayleigh scattering , geodesy , geophysics , geomorphology , mantle (geology) , sound (geography) , optics , telecommunications , radar , physics , artificial intelligence , computer science , image (mathematics)
We perform ambient noise tomography of China using data from the China National Seismic Network and surrounding global and regional stations. For most of the station pairs, we retrieve good Rayleigh waveforms from ambient noise correlations using 18 months of continuous data at all distance ranges across the entire region (over 5000 km) and for periods from 70 s down to about 8 s. We obtain Rayleigh wave group velocity dispersion measurements using a frequency‐time analysis method and invert for Rayleigh wave group velocity maps for periods from 8 s to 60 s. The tomographic maps display significant features that correlate with surface geology. Major basins, including Tarim, Junggar, Qadaim, Sichuan, Bohai‐Wan, and Songliao, are all well delineated by slow group velocities at shorter periods (10 to 20 s). The overall trend of crustal thickening from east to west is well represented by group velocity decreases from east to west at periods around 30 s.