Hi @Astor,

Sorry for the delay.

I never tried it myself, but I believe you should be able to simulate a 2D gravity survey by using a 3D mesh with only one very wide cell in the Y-axis direction. The survey would then have to be centred in the middle of those very long Y-axis cells. Here is an example script to create such mesh:

```
import numpy as np
import discretize
import matplotlib.pyplot as plt
ncx = 16 # number of cells in the x-direction
ncy = 1 # number of cells in the y-direction
ncz = 4 # number of cells in the z-direction
dx = 5 # base cell width x
dy = 1e5 # base cell width y
dz = 5 # base cell width z
hx = dx * np.ones(ncx)
hy = dy * np.ones(ncy)
hz = dz * np.ones(ncz)
# create a tensor mesh
tensor_mesh = discretize.TensorMesh([hx, hy, hz],x0="CCN")
print(tensor_mesh)
fig, ax = plt.subplots(1,1,figsize=(10,20),subplot_kw={"projection": "3d"})
tensor_mesh.plot_grid(ax=ax)
```

Maybe @domfournier would have more insights as well.