1. Testing the Resistance of Paths Through the Earth Near the LVEA

2. Background Information Who found the problem? Why measure the resistance? Why is it important here at LIGO? What is a grounding mesh?

4. What project was proposed and by whom? What is the physics behind the experiment? How did we test the resistance of paths through the earth and what were the tools involved? What did the final schematic look like? Project

5. Where: V = Voltage measured in volts I = Current measured in amperes R = resistance measured in Ohms Ohm’s Law

15. Results What were the results? Were there any peculiarities involved? Which is the recommended site of the ground mesh, and why?

16. Data collected in order by station Data collected in order by resistance