Method and device for quickly constructing fine ground motion field

The invention provides a method and a device for quickly constructing a fine ground motion field, and relates to the technical field of geophysics. The method comprises the following steps: establishing a large-scale macroscopic field seismic analysis model containing seismic source and fault characteristics; establishing a small-scale fine field earthquake analysis model of the to-be-analyzed area; selecting a plurality of seismic source sliding models, calculating a macroscopic field seismic motion field, and calculating a local field seismic motion field under the influence of each seismic source sliding model in combination with a boundary coordination relationship between a large-scale macroscopic field seismic analysis model and a small-scale fine field seismic analysis model; establishing an average time-frequency domain association relationship between the seismic source sliding model and a local field seismic oscillation field; and for any seismic source sliding model, according to the average time-f