Quality over quantity: on workflow and model space exploration of 3D inversion of MT data

Earth, Planets and Space

Table 3 Results of lateral cell size tests

Cell size (m)	Cov	X	Y	X span (km)	Y span (km)	RMS overall	RMS 10–100 s	RMS 100–1000 s	RMS 1000–10,000 s	RMS\(_{\text{var}}\)	KSU
5000	0.5	102	156	3047	3317	2.03	2.2	1.95	1.9	7.7	8.4
5000	0.4	102	156	3047	3317	1.64	1.79	1.56	1.55	10.0	9.8
7500	0.4	68	104	3004	3274	1.75	1.98	1.65	1.56	8.1	5.3
10,000	0.4	51	78	3318	3048	1.99	2.28	1.88	1.73	5.2	5.8
10,000	0.3	51	78	3318	3048	1.54	1.8	1.4	1.32	9.1	5.3

Details of the five inversions used to determine the best lateral cell size for AusLAMP inversion (5000, 7500 and 10,000 m)
These were run with all the same covariance (0.4) and then with a larger covariance for the 5 km to reduce speckling (0.5) and smaller for the 10 km to get a more detailed model (0.3). The starting RMS is constant, 25.3