When the basement distributes near the surface, the maximum eigenvector points in the vertical direction to the high-density basement.
The maximum eigenvector on the basement points in the vertical direction to the high-density basement, and the minimum eigenvector points in the horizontal direction.
The rest of the computation are carried out on 51 grid points in the vertical direction with (c=10^4) (equivalent to a uniform grid distribution in the physical domain), this gives the uniform grid distribution in computational domain.
In addition, in the area away from the boundary, it was found that the maximum eigenvector on the basement and the minimum eigenvector on the sediment point in the vertical direction, and the maximum eigenvector on the sediment and the minimum eigenvector on the basement point in the horizontal direction, regardless of whether the boundary is a normal fault or reverse fault.
The effect of the high-density basement is weak in the sedimentary layer area, while the effect of the low-density sedimentary layer is strong; therefore, the minimum eigenvector points in the vertical direction to the low-density sediment and the maximum eigenvector points in the horizontal direction.
The experimental results show that the uncertainty could be as small as 0.08 μm at same the point detected repeatedly in the vertical direction.
As in [ 5, 10, 11], a point source that emits in the vertical direction is assumed.
In addition, the maximum eigenvectors on the right side of the "Kurehayama Fault" shown in this figure point to the vertical direction, and the minimum eigenvectors in the left side of the "Kurehayama Fault" point to the vertical direction.
In addition, if the basement distributes near the surface, the maximum eigenvector points to the vertical direction.
At most of the grid points, the moderate principal stress axis is in the vertical direction.
