An iterative least-squares approach to depth determination from residual magnetic anomalies due to thin dikes

✍ Scribed by E.M. Abdelrahman; S.M. Sharafeldin

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 642 KB
• Volume: 34
• Category: Article
• ISSN: 0926-9851
• DOI: 10.1016/0926-9851(95)00017-8

✦ Synopsis

We have developed a least-squares approach to depth determination from residual magnetic anomalies due to thin dikes. By defining the zero-anomaly distance x0 and the anomaly value T( 0) at the origin on the profile, the problem of depth determination from magnetic data has been transformed into the problem of finding a solution of a non-linear equation. Procdures are also formulated to estimate the amplitude coefficient and the index parameter. The method is applied to synthetic data with and without random noise. The obtained depth agrees with the model depth within f 4%. The percentage error approaches zero as the sampling interval decreases to 0.25 depth units. Error in the depth parameter due to errors in x,, and T( 0) was also studied through imposing + l-IO% errors on these parameters on a synthetic profile due to a thin dike. The maximum error in depth is f 12%.