SW4 (Seismic Waves, 4th order) implements substantial capabilities for 3-D seismic modeling, with a free surface condition on the top boundary, absorbing super-grid conditions on the far-field boundaries, and an arbitrary number of point force and/or point moment tensor source terms.
Hi @youngkyu-kim writeEvery controls how frequently the data is flushed to the file, it does not down sample the data. The rechdf5 command supports down sampling in time, see User Guide for the details.
The number of time steps is 690.
I used rec command with writeEvery=2 option like below.
rec x=3.0e3 y=3.0e3 z=0 file=x3p0_y3p0 sta=x3p0_y3p0 variables=displacement writeEvery=2
But I got output values at every time step regardless of writeEvery option.