Magnetic Anomalies of Impact Craters at Low Magnetic Latitudes
Environmental and Engineering Geophysical Society (EEGS), 2012 Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP) proceedings.
Les P. Beard, Zonge International, Tucson, Arizona.
Paper – [pdf] EXPL_SAGEEP_LowLatImpactCraters_LPB_2012
can produce induced magnetic anomalies with sufficient magnitudes for detection by aero-magnetic surveys, but which are not decidedly ring-like in appearance. Low latitude rings usually show sizeable anomalies only at their north, south, east, and west extremities. The east and west anomalies may not be large enough spatially to detect with wide line spacing, but the north and south anomalies are usually spatially broad. Most of the remainder of the ring is of such low magnitude as to be almost undetectable. Complex craters produce sizeable magnetic lows in the center. Craters filled with non-magnetic debris may produce detectable magnetic highs. The ability to predict what types of anomalies may be formed by low magnetic latitude impact craters may be useful in identifying these structures in areas such as West Africa or Brazil, where dense vegetation and poor access make detailed initial inspection problematic.