ISPI(TM) - THE IMPROVED SOURCE PARAMETER IMAGING METHOD

Interpretation of an anomalous magnetic response involves determining the parameters that characterize the source of the anomaly. The depth to the top of the structure is a parameter that is commonly sought, an d the Source Parameter Imaging(TM) (SPITM) method is one way of determ ining this depth estimate. One advantage of the SPI method is that the depths can be displayed on an image. Typically there can be one image for an assumed contact (fault) model and another image for an assumed dipping thin sheet (dike) model. The depth estimate obtained will dep end on the model assumed. An improvement to the source parameter imagi ng method extends the method to horizontal cylinders and at the same t ime allows the most appropriate model to be determined automatically. This model can be displayed on an image and the correct depth estimate for each anomaly can also be determined. The depth estimates can ther efore be summarized on one map independent of an assumed model. The im ages generated from synthetic and held data show that the improved SPI method makes the task of interpreting magnetic data significantly eas ier.