'Direct air wave' diaporamas de présentation

Understanding Seismic Events

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Lecture 19

Lecture 19. VLF GPR. Phase. Phasor. Advanced in phase cos(wt+ ? ). ?. In phase cos(wt). V R. resistance. V. V L. Voltage in inductor Leads voltage in Resistor (current) by 90 degrees Total voltage leads Current by ?. Inductor. V. V L. ?. V R. Magnetic versus non magnetic.

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Lecture 16

Lecture 16. Electromagnetic Surveying. Chapter 13 Induced Polarization IP and Self-Potential SP. IP charge stored in an ore when a current flows, it decays when current is turned off SP small voltages (potentials) generated naturally. IP. Conducting ores in non conducting matrix

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