Joint inversion of group and phase velocity using a model with 5 km layers in the top 15 km and 10 km layers down to 120 km. Models have fair resolution down to 110 km. The mide crust low velocity zone is slightly more pronounced on the Lhasa model. Moho is well-defined in each. Low velocities immediately above Moho may be accomodating misplaced layer boundary. The most striking feature is the difference in mantle velocities. Lhasa velocities increase quasi-linearly from 4.1 km/s beneath the Moho to about 4.7 km/s at 120 km depth. Under Qiantang, the velocities remain constant at about 4.2 km/s.
The data fits look much like the those from model 1. The phase velocities are fit with consistently with a smoothed version of the data points.
| MODEL PLOT: range of initial models: gray final models: violet mean of final models: black VELOCITY PLOT: Initial group velocity: pale blue Initial phase velocity: pink/gray Final models: black Measured group velocity: blue Measured phase velocity: red |
