L01_Introduction-page2

L01_Introduction-page2 - Remote sensing Constraining the...

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Unformatted text preview: Remote sensing Constraining the Earth’s sub-surface with observations at the surface Geophysical techniques measure physical phenomena: • Gravity • Magnetism • Elastic waves • Electricity • Electromagnetic waves Which are sensitive to sub-surface physical properties: • Density • Magnetic susceptibility • Seismic wave velocity and density • Resistivity • Conductance/inductance/permitivity Oh, and it’s relatively cheap Applied geophysics – Introduction Active and passive Passive Measure naturally occurring phenomena • Gravity field • Magnetic field • Seismic arrivals - earthquakes Active Transmit a signal into the subsurface and record what comes back • Seismic arrival – explosions • Electrical current • Electromagnetic waves think scale Applied geophysics – Introduction 2 ...
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This note was uploaded on 01/07/2012 for the course PHYSICS 384 taught by Professor Wei during the Spring '09 term at SUNY Stony Brook.

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