Inversion of magnetovariation event to causative current. III. Test of channelled current model, SABC conductor inverted as chennelled currents and structure evaluation

Details Inversion of magnetovariation event to causative current. III. Test of channelled current model, SABC conductor inverted as chennelled currents and structure evaluation Inversion of magnetovariation event to causative current. III. Test of channelled current model, SABC conductor inverted as chennelled currents and structure evaluation

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pepi...53...64x&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 53, Issue 1-2, p. 64-79.

Physics

3

Scientific paper

Algorithms developed in an earlier paper for the inversion of fields of channelled currents are tested with models. The deepening effect of the inverted model expected from the spreading of current is found to be slight. The same algorithms are then applied to 1983 magnetometer array data which appear to be dominated by current channelling. The model space is explored with different models and constraints on models, and with inversion from different data sets. Some features are consistent with all best-fitting 3-D line and sheet current models inverted. These are: (a) the conductor plunges east of the Canadian Rocky Mountains, and (b) it makes a sharp bend towards the east with the plunge. The inversion results are compatible with other geophysical data from the same area. The conductive structure is located crossing the Rocky Mountains in the depth range 30-120 km. It is either in the upper mantle or in the lower crust, and may be related to a seismic low-velocity zone.

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