Magnetic Ocean Floor

A marine magnetic anomaly is a variation in strength of earth s magnetic field caused by magnetism in rocks of the ocean floor.

Magnetic ocean floor.

Marine magnetic anomalies typically represent 1 percent of the total geomagnetic field strength. Magnetic evidence for seafloor spreading explains how magnetic polarity frozen into seafloor basalts reveals evidence for the creation of new seafloor at mid ocean ridges. New rock is formed by magma at the mid ocean ridges and the ocean floor spreads out from this point. These patterns were unlike any seen for continental rocks.

The strips on the atlantic ocean floor in particular all seemed parallel to the mid atlantic ridge that is a volcanic ridge running roughly north to south with some zigs and zags halfway between europe africa and america. The striped magnetic pattern develops because as oceanic crust pulls apart magma rises to the surface at mid ocean ridges and spills out to create new bands of ocean floor. Among the new findings was the discovery of zebra stripe like magnetic patterns for the rocks of the ocean floor. Mapping of variation over an area is valuable in detecting structures obscured by overlying material.

Magnetic striping of the sea floor after mid ocean ridges and trenches were discovered more evidence was discovered that helped to support the theory that the continents had moved around. A negative magnetic anomaly choose one. It s 1 and 3 the person was right saying it was number 2 you where incorrect on saying it was 1 and 3. The oceanic crust displays a pattern of magnetic lines parallel to the ocean ridges frozen in the basalt.

A symmetrical pattern of positive and negative magnetic lines emanates from the mid ocean ridge. Magnetic striping magnetic minerals are found in rocks. The magnetic variation in successive bands of ocean floor parallel with mid ocean ridges is important evidence supporting the theory of. These two things were the magnetic striping on the ocean floor and the age of seafloor rocks.

Describes the sawtooth pattern of magnetic signal strength measured along the atlantic ocean seafloor. Is indicated when a magnetometer measures intervals of magnetism that are weaker than expected. In the ocean floor the magnetization was orderly arranged in long strips. The magnetic field that is produced by the oceans the molten core and rocks in the crust and upper mantle protects the planet from streams of charged particles known as the solar wind.

Is created when weak magnetic forces in basalt grains add to the force produced by the earth s dipole.