In this directory, it contains Pn, Sn velocity beneath eastern China in the XYZV format. Files:P.xyzv: Pn wavespeedS.xyzv: Sn wavespeedThe velocity are defined on regular grids with 1 degree by 1 degree with depth interval of 5 km. P_0.25.xyzv: Pn wavespeedS_0.25.xyzv: Sn wavespeedThe velocity are defined on regular grids with 0.25 degree by 0.25 degree with depth interval of 5 km. The four columns stand for longitude, latitude, depth, velocity.100.000000 17.000000 -10.000000 1.500417100.000000 18.000000 -10.000000 1.502226100.000000 19.000000 -10.000000 1.501874 P.xyzv ranges for longitude, latitude, depth and P wavespeed.S.xyzv ranges for longitude, latitude, depth and S wavespeed. Please note that, Pn and Sn sample the uppermost mantle (downward to about 75km for P and about 65 km for S) well. The model has depth range of -10 km -- 200 km. This is because the inversion is a 3-D inversion, which defines velocity on regular grids in 3-D. Therefore, the mantle at depths 75--100 km for P and 65--100 km are little sampled. The velocity below 100 km should be inherited from the initial model. The velocities in continental regions have good resolution of 2-by-2 degree or better in most regions. In oceanic regions, the velocities are inherited from the initial model. For details, please refer to the papers below. If you use the data, I would appreciate you can cite the two papers below.Sun, Weijia, and B. L. N. Kennett (2016), Uppermost mantle P wavespeed structure beneath eastern China and its surroundings, Tectonophysics, 683, 12-26.Sun, Weijia, and B. L. N. Kennett (2016), Uppermost mantle structure beneath eastern China and its surroundings from Pn and Sn tomography, Geophys Res Lett, 43(7), 3143-3149. If any problems, please do not hesitate to contact me. Email: swj@mail.iggcas.ac.cn Weijia Sun