AN EXAMPLE OF THE IMPORTANCE OF NATURAL REMANENT MAGNETIZATION IN THE INTERPRETATION OF MAGNETIC ANOMALIES

Abstract

A bstract An example is given from the Gulf of Aden of a total intensity magnetic anomaly which cannot be explained by a body assumed to be magnetized in the direction of the Earth's present magnetic field. It is enferred that the natural remanent magnetization is much greater than the induced magnetization and computations have been made which suggest the presence of igneous rocks with a reverse magnetization. The example illustrates that it is important to know the ratio of remanent to induced magnetization and the direction of remanent magnetization for the correct interpretation of magnetic anomalies.