Discovery of magnetic striping on ocean floor.
Magnetic striping of ocean floor gives relative ages.
Plate tectonics from the late latin.
Coast and geodetic survey ship pioneer in a joint project with the u s.
The survey data was used to create three dimensional relief maps of the ocean floor and by 1953 american oceanic cartographer marie tharp had created the first of several maps that revealed the presence of an underwater mountain range.
When scientists studied the magnetic properties of the.
The discovery adds a key element to the theory of plate tectonics.
This distortion was recognized by icelandic mariners as early as the late 18th century.
Scientists can determine the age of the seafloor by examining the changing magnetic field of our planet.
Navy and the scripps institution of oceanography tows the first marine magnetometer and finds magnetic striping on the seafloor off the west coast.
Pertaining to building is a scientific theory describing the large scale motion of seven large plates and the movements of a larger number of smaller plates of earth s lithosphere since tectonic processes began on earth between 3 3 and 3 5 billion years ago.
1962 harry hess names spreading ridges 1963 magnetic striping of ocean floor gives relative ages.
1960s defined the driving forces of plate tectonics.
Magnetic stripes are the result of reversals of the earth s field and seafloor spreading.
Tectonicus from the ancient greek.
The models show a ridge a about 5 million years ago b about 2 to 3 million years ago and c in the present.
It is called a geomagnetic reversal.
Paleomagnetism or palaeomagnetism in the united kingdom is the study of the record of the.
This has happened many times throughout earth s history.
1963 hot spots defined.
Shortly after the conclusion of world war ii sonar equipped vessels crisscrossed the oceans collecting ocean depth profiles of the seafloor beneath them.
New oceanic crust is magnetized as it forms and then it moves away from the ridge in both directions.
1953 marie tharpe recognizes mid ocean ridge spreading.
Every once in a while the currents in the liquid core which create the earth s magnetic field reverse themselves.
More important because the presence of magnetite gives the basalt measurable magnetic properties these newly discovered magnetic variations provided another means to study the deep ocean floor.
