The Gulf of Aden axial magnetic anomaly
Armies of Liberation covers all Yemen related topics. The reverse magnetic field in the Gulf of Aden has spawned theories that it is a) a worm hole opening b) aliens or c) an underwater military base. These wacky theories are augmented by the international attention to the area including China’s first naval excursion in a century, Iran’s ships and the many western countries that are patrolling the Bab al Mendab for piracy. However the reason for the reverse magnetism is much more likely its this:
Gulf of Aden axial magnetic anomaly and the Curie temperature isotherm
Nature.com, D. Tamsett & R. W. GirdlerSchool of Physics, The University, Newcastle upon Tyne NE1 7RU, UK
The main features of magnetic anomalies over ocean ridges have been explained1 as a corollary of seafloor spreading and geomagnetic reversals. Oceanic crust is formed in a narrow region, becoming magnetized in the direction of the Earth’s magnetic field as its temperature falls through the Curie point of the magnetic minerals present. The Gulf of Aden was one of the first places where reversely magnetized sea floor was recognized2. The seafloor spreading direction and latitude are such that the anomaly due to normal magnetization is negative and slightly skewed.
Positive anomalies were also observed suggesting the presence of reverse magnetization. A short wavelength magnetic anomaly which frequently occurs superimposed on the axial magnetic anomaly in the Gulf of Aden is now described. Various interpretations are considered; the preferred involves a dramatic shallowing of the Curie temperature isotherm close to the seafloor spreading centre. The interpretation has implications for models of the generation of oceanic lithosphere and for locating possible geothermal areas in rifted regions.


