The grid spacing is and in the **x** and **z** direction, respectively.
The number of time steps are and the computational effort is ,
or floating point operations per step.
The number of individual shot records is .
The **n** terms are about the same magnitude and is considerably less
in value, typically around 25;
is the operations count of
the finite difference operator.
The complexity of
shot record modeling is and the
complexity of zero-offset modeling is
which is less.