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Introduction to geophysical methods: Techniques and targets

1 Applied geophysics IntroductionTechniques and targetsIntroduction to geophysical methods :Reference:Sharma p1-10 Reynolds p1-27 Applied geophysics IntroductionWhat do we mean by applied geophysics?2 Applied geophysics IntroductionRemote sensingConstraining the Earth s sub-surface with observations at the surfaceGeophysical Techniques measure physical phenomena: Gravity Magnetism Elastic waves Electricity Electromagnetic wavesWhich are sensitive to sub-surface physical properties: Density Magnetic susceptibility Seismic wave velocity and density Resistivity Conductance/inductance/permitivityOh, and it s relatively cheapApplied geophysics IntroductionActive and passiveActiveTransmit a signal into the subsurface and record what comes back Seismic arrival explosions Electrical current Electromagnetic wavesPassiveMeasure naturally occurring phenomena Gravity field Magnetic field Seismic arrivals - earthquakesthink scale3 Applied geophysics IntroductionOur to kilometersThe Techniques we ll talk about are used in the fields of Environmental geophysics Engineering geophysics Exploration geophysicsApplied geophysics IntroductionPlanning a survey4 Applied geophysics IntroductionTarget identificationApplied geophysics I

3 Applied geophysics – Introduction Our scale …meters to kilometers The techniques we’ll talk about are used in the fields of • Environmental geophysics • Engineering geophysics • Exploration geophysics Applied geophysics – Introduction

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