Table 1.

The depths obtained through higher-order horizontal derivative analyses for synthetic magnetic anomalies

Graticule spacing (s)	Second order derivative		Third order derivative		Fourth order derivative
	Estimated depth (m)	Iteration number	Estimated depth (m)	Iteration number	Estimated depth (m)	Iteration number
Synthetic model without noise
2	6.00	36	6.00	26	6.00	27
3	6.00	26	6.00	18	6.00	22
4	6.00	21	6.00	15	6.00	19
5	6.00	17	6.00	13	6.00	16
Synthetic model with noise
2	5.14	31	6.05	26	4.82	24
3	6.30	27	5.44	17	6.44	23
4	5.79	20	6.39	16	5.81	18
5	6.15	18	5.87	13	6.17	17
Average depth (m)	5.84 ± 0.52		5.94 ± 0.39		5.81 ± 0.71