10 Questions
What are the two main categories of electromagnetic methods?
Active (controlled source) methods and Passive (natural field) methods
What is the primary parameter measured by electromagnetic methods?
Electrical conductivity (resistivity) of the Earth's materials
What is the relationship between the distance between the transmitter and receiver coils and the depth range under investigation in FEM?
The distance between the transmitter and receiver coils is directly proportional to the depth range under investigation
What are the three types of measurements that can be conducted using electromagnetic methods?
Mapping, profiling, and sounding
What is the relationship between the operating frequency and ground conductivity in FEM?
The ground conductivity and operating frequency have an inverse relationship
What is the correlation of the level of inquiry in TEM with other factors?
The level of inquiry is closely correlated with the loop size, recording time interval, and shut-off time.
What is one of the main advantages of the EM methods?
The process of induction does not require direct contact with the ground.
How do EM surveys compare to resistivity surveys in terms of survey difficulties?
EM surveys counter survey difficulties with land models that have very conductive uppermost layers, whereas resistivity surveys counter difficulties with models that have very resistive uppermost layers.
What is an advantage of EM methods compared to electric methods?
EM methods have a greater penetrating depth than electric methods.
What are some of the applications of EM methods?
Applications include mineral resource assessment and exploration, investigating and monitoring hydrocarbon reserves, surveys of groundwater, and more.
This quiz covers the basics of electromagnetic methods in geophysics, including controlled source and natural field methods, and their applications in geology.
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