Alpha Geoscience | Tim’s Tip - Using Transient Electro-magnetics (TEM) instead of Resistivity for Mapping

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Tim’s Tip - Using Transient Electro-magnetics (TEM) instead of Resistivity for Mapping

Have you ever considered using TEM for mapping the subsurface for changes in resistivity? There are a number of advantages in using TEM including:

Tim Pippett
Managing Director
Alpha Geoscience

1. Greater speed of data acquisition.

2. Less physically demanding field work, with lighter equipment and no requirement for inserting pegs into the ground.

3. As current is induced from cables on the surface there is no requirement for electrical connectivity through electrodes. This increases the range of areas where a survey will be effective. For example it allows data collection in high surficial resistivity zones, and in areas covered by ice or exposed rock.

4. Ability to carry out a TEM survey on the ground, at sea or in the air.

5. Less subject to lateral effects that are present due to the electrode spread in resistivity methods.

6. The downward migrating signal results in less distortion due to local inhomogeneities.

7. The ability to use with different loop configurations allows tailoring of the system to specific survey requirements and target types.

8. Versatile equipment allowing ease of changing of pulse width, recorded channels and loop size to suit particular needs.

9. Increased depth of penetration.

10. Better resolution of features at depth.

11. Improved mapping of tectonic features.

12. Ease of viewing in profile, decay curve or resistivity pseudosections.

13. More information available due to the range of data analysis techniques and integration of the various presentation methods.

For your next survey TEM may be the best option for you. Find out more

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