Comment on Electrical Resistivity Tomography and Induced Polarization

Mostafa Ebrahimi,
When you ask questions like this, spell out what all the acronyms. IP is mostly “intellectual property” or other things on the Internet.
“electrical resistivity tomography” “induced polarization” gives 42,100 entries on Google search. That means it is fairly mature.  If you are actively surveying a large region you might use higher power levels.  It depends on the character of the earth or materials where you are trying to look.
It shows up on Wikipedia immediately, as (related)
You need to search for specific instruments. They can often explain the methods clearly and simply.
I was just looking at “earth conductivity models” today. Resistivity is somewhat out of vogue now, so try searching for “conductivity”.
The simplest thing to do is search for
“induced polarization” “amperes” which has 12,900 entry points
Just reading the summaries it looks like 2 to 10 amperes is common.
Also look into “magnetotelluric”, “acoustic magnetotelluric”
When you ask questions, also say why you want to know, what you have already tried, and why it is important.
Many electromagnetic and gravitational imaging methods use passive sources – lightning, cosmic ray magnetic impulses, ionospheric storms, solar magnetic storms, human generated signals of many sorts. If they have low frequencies or operate for long periods, part of the signal can go through the earth and then be used for imaging.
Richard Collins, Director, The Internet Foundation
Richard K Collins

About: Richard K Collins

Director, The Internet Foundation Studying formation and optimized collaboration of global communities. Applying the Internet to solve global problems and build sustainable communities. Internet policies, standards and best practices. Consulting and advising organizations of all sizes. Not for profit. When you get down to it, all these papers on the Internet and published, were originally just letters between friends and people of similar interest. Current projects: Best practices for all Internet sites, and for global communities using the Internet. Improving model and data flows, establishing end-to-end lossless and open channels. Particularly for global scale issues such as "covid", "global climate change", "online education", "solar system colonization", "research", "development", and "learning". Education and Interests: Gravitational sensors, sensor networks, modeling and simulation of all things, encouraging development of a gravitational engineering industry, calibrating new gravitational sensors.

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