Magnetic stripes on the Seafloor Part 1: Earth’s Magnetic field.

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Presentation transcript:

Magnetic stripes on the Seafloor Part 1: Earth’s Magnetic field

Earth’s magnetic field is a Dipole Field, like a bar magnet’s field

North Geographic Pole: top of Earth, “true north” North Geomagnetic Pole: where your compass points

Rocks with iron in them got magnetized by Earth’s field! Paleomagnetism: studying the magnetization of old rocks What was Earth’s magnetic field in the past?

Earth’s field sometimes flips (Reverses)

Normal Polarity: Your compass points near geographic North, the same way it does today Reverse Polarity: Your compass points the opposite way it does today (near the South geographic pole)

Geomagnetic Polarity Time Scale (GPTS): Timeline of magnetic field polarity

VGP: Virtual Geomagnetic Pole Scientific name for the ancient geomagnetic north pole location (given in latitude and longitude) Important Review: POSITIVE Latitudes = Northern Hemisphere NEGATIVE Latitudes = Southern Hemisphere GPTS activity

Magnetic stripes on the Seafloor Part 2: The Seafloor Tape Recorder

Newly forming ocean crust gets magnetized “Stripes” of new crust are Normal and Reverse polarity Stripes are symmetrical on both sides of the mid-ocean ridge

Sea-floor Spreading and Magnetic Stripes