Crustal thicknesses of Asia/China

中国大陆地壳厚度分布

1. Moho points, China/Asia, from seismic stations

Crustal thicknesses beneath 1669 seismic stations, including permanent and portable seismic stations, in China were retrieved using 1-D S-wave velocity models, which were obtained by linearized inversion of the RFs with initial reference models from regionalized S-wave velocities of surface-wave inversions. Synthetic tests in Feng et al. (2017) demonstrated that this inversion scheme is superior to a jointly linearized inversion of RFs and surface waves. It is noted that the thicknesses are distance from surface to the Moho discontinuity. 理论测试(Feng et al., 2017 )证明了:先用面波频散反演一维S波波速模型,然后用该模型做利用接收函数(或与面波联合)反演一维波速的初始模型,明显优于直接进行面波和接收函数的线性化联合反演。据此,我们对中国大陆内的1669个台站进行了这种两步反演,然后根据所得到的波速模型确定了台站下方的地壳厚度。见下图和下面可下载的数据文件。

The thicknesses can be downloaded:

The thicknesses are shown in figure below:

Figure 1. Crustal thicknesses beneath 1669 seismic stations in China. The figure is the same as Figure 6 in Feng et al. [2017]. The thicknesses are determined from 1-D S-velocity models inverted from receiver functions, but not from H-k stacking. [download PDF]


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2. Moho map, Central-East Tibetan Plateau (CETP2020-CRUST)

Crustal thickness map in Central-East Tibetan Plateau were retrieved using 3-D S-wave velocity model of CETP2020-S, which were obtained by a direct joint inversion from receiver functions and surface-wave inversions Feng et al. [2020].

The thicknesses can be downloaded:

  • Compressed xyzv (lon, lat, depth, Vs) file/经、纬、深度、波速的xyzv压缩文件: [download].
    Each position (x/lon, y/lat) is the center of a cell. This file is the same as Table S2 in Feng et al. [2020].
  • Compressed netCDF grid files: [download].
    After uncompress it by run "tar -zxvf CETP2020-S_depth_grd.tar.gz", you can get 51 grid file. The name of the files are in a format: "CETP2020-S_hslice_${depth}.grd". If you need ascii files, you can convert them by grd2xyz (a command in Generic Mapping Tools) or other tools.

The thicknesses are shown in figure below:

Figure 2. Crustal thickness map beneath Central-East Tibetan Plateau. The figure is the same as Figure 8 in Feng et al. [2020]. The thicknesses are determined from 3-D S-velocity models jointly inverted from receiver functions and surface waves. [download PDF]


References / 参考文献

Feng Mei, An Meijian, Dong Shuwen, 2017, Tectonic history of the Ordos Block and Qinling Orogen inferred from crustal thickness. Geophys. J. Int., 210 (1): 303-320. doi:10.1093/gji/ggx163. [Full text] [ go to the paper ... ].

Feng Mei, An Meijian, James Mechie, Zhao Wenjin, Xue Guangqi, Su Heping, 2020, Lithospheric structures of and tectonic implications for the central-east Tibetan plateau inferred from joint tomography of receiver functions and surface waves. Geophys. J. Int., 223 (3), 1688–1707, doi:10.1093/gji/ggaa403. [Full text] [ go to the paper ... ].