MT 3D Inversion Workshop: Dublin Test Model 1 (DTM1)
The 3D forward model consists of 3 different blocks in a homogeneous 100 Ωm half-space. The figure below shows sketches of the construction in section and plan view, and the table summarizes the dimensions and resistivity values of the bodies.
The origin of the coordinate system (COSY) will be in lateral direction at the center of body 1, but of course on the surface - with z positive downwards. Looking at the plane view x is positive upwards and y to the right.
 |
|---|
|
extend in x (km) |
extend in y (km) |
extend in z (km) |
resistivity (ohm-m) |
|---|---|---|---|---|
|
Body 1 |
-20 to 20 |
-2.5 to 2.5 |
5 to 20 |
10 |
The sites are located on 3 profiles parallel to the y-direction: one at x = -15 km, the second at x = 0 km and the third at x = 15 km. Each profile has 16, equally distributed sites with a station spacing of 5 km (from y = -37.5 km to y = 37.5 km). And additional 11 sites are located on a fourth profile at y = 0 km with a site spacing of 5 km (from x = -25 km to x = 25 km).
To view a movie of the 3D model, click here.
The forward responses at all sites for the period range of 0.1 s to 10 000 s (0.1 s, 0.18 s, 0.32 s, 0.56 s, 1 s, 1.8 s, 3.2 s, ...., 5600 s, 10000 s) were computed by different scientists using different codes. These forward responses can be found here.