def METHOD_NAME(self, locs):
    """Compute displacement field at locations.
    """
    (npts, dim) = locs.shape
    disp = numpy.zeros((numSteps, npts, self.SPACE_DIM), dtype=numpy.float64)
    disp[:,:, 2] = numpy.dot(ezz.reshape(numSteps, 1), (locs[:, 2] + 8000.0).reshape(1, npts))
    return disp