Geophysics techniques Flashcards
To outline the use of geophysical techniques and the way they work during excavation
1
Q
What is resistivity most useful for?
A
Detecting buried features such as ditches and walls
2
Q
How does resistivity work?
A
It investigates how well a site conducts electricity using probes
3
Q
How far below the ground to the probes go during resistivity techniques?
A
Up to 20cm
4
Q
What principle does Resistivity work off?
A
That the ground retains moisture and this affects its ability to conduct an electric current
5
Q
Give 2 examples as to where Resistivity successfully identified buried features
A
Roman Villa in Peterborough- presence of walls and entire complex
Chester amphitheatre- second theatre found
6
Q
What principle does magnetometry work off?
A
That the earth maintains a magnetic field which over time may develop abnomalities
