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Quick Tip: What attracts animals to your ERI survey (and how can you stop them)?
Posted by Sean on Jun 11, 2019
Electrical Resistivity Surveys mostly happen outdoors. Of course, you can perform small-scale tests indoors, but most clients aren’t going to give you such a comfortable project. So you’ll need to make your way outdoors into the heart of mother nature. And as such, you’ll be sharing your space with all manner of wildlife.
Some animals will shy away if they notice you working around their habitat. Others can be more curious—or attracted to some aspects of the survey.
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Square Array: Electrical Resistivity Methods, Part 7
Posted by Sean on Jun 06, 2019
Welcome back to our series detailing the different electrode arrays that you may come across in your work. This is the seventh article in our series exploring 11 electrode arrays and methods. We’ve covered some of the standard arrays that will cover most of your bases. In the last post, we’ve started talking about some lesser known arrays. Today, we’re discussing another non-standard electrode array—the Square Array.
If you’re interested, we’ve also covered the following:
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Equatorial Array: Electrical Resistivity Methods, Part 6
Posted by Sean on Jun 03, 2019
Many moons ago we wrote a series of blog posts detailing the standard array types that you’re most likely to use in your work (links below). Now we’re back to finish off the series with the remaining 6 arrays that aren’t commonly used. And since we’re in the middle of this blog series, why not discuss the Equatorial Array? Get it? Because “equatorial” sounds like “equator”. Ok, bad jokes aside, let’s get on with it.
If you want to check out the previous arrays we’ve discussed, here are links to those posts:
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How To Do Small-Scale Electrical Resistivity Imaging Lab Tests
Posted by Sean on May 13, 2019
In the academic world, small-scale resistivity tests come up a lot. Often, researchers need to demonstrate the theory in action. And even more often, they don’t have the space to set up a standard cable of electrodes.
With tools like the SwitchBox Grid®, researchers can create and use DIY electrode cables that are more manageable for small-scale in-class demonstrations. (Psst...we've snuck in a video explaining the SwitchBox Grid® at the end...
2019 Karst and Cave Meeting Calendar
Posted by Sean on May 03, 2019
If you’re anything like us, cave/karst conferences tend to sneak up on you. You spend a week in May attending Hypogea in Bulgaria, and before you know it, it’s October and you’re in the USA attending the National Cave and Karst Management Symposium.
So to help you keep track, we’ve put together this definitive list of cave and karst meetings happening in 2019. Enjoy!
Customer Spotlight: USGS | Using Resistivity to Map Permafrost Erosion on the Alaskan Coast
Posted by Sean on May 01, 2019
The USGS has done stellar work to better understand the erosion of shorelines on the U.S. Arctic coast. Two teams of scientists traveled to the very actively eroding Barter Island to collect data. Both teams observed erosion and associated shoreline loss through various means, which you can read about in full here.
This being the AGI blog though, we want to focus on the Electrical Resistivity Tomography (ERT) part of the project.
In September...
Quick Tip: Depth of Investigation for ERI Surveys
Posted by Sean on Apr 15, 2019
You can’t talk about Electrical Resistivity Imaging (ERI) surveys without eventually talking about depth. Aside from resolution, depth of investigation is one of the first talking points our customers want to discuss when considering ERI surveys.
What is depth dependent on in ERI?
First of all, depth of investigation will depend on the largest array span you use during your survey. Array span shouldn’t be confused with survey line length. It’s a common misconception that longer survey lines=more depth or that roll-along=more...
Quick Tips: Electrode Preparation and Removal
Posted by Sean on Apr 10, 2019
We here at AGI are big advocates of saving time. Seriously, if time is money—then we’re serious penny pinchers. That said, we’re always looking to pass on time-saving tips to you! Today we’re showing you a couple of quick tips that can save you a couple of minutes on the field. Particularly, these tips are focused on electrode preparation and removal. You may scoff at saving a few minutes, but here in the Texas sun—a few minutes is the difference between a suntan and sunburn!
Tip 1: Getting the stakes installed correctly will save you troubleshooting...
Typical Ranges of Resistivities for Common Materials
Posted by Sean on Mar 28, 2019
Electrical Resistivity Imaging (ERI) is a fantastic geophysical method for subsurface exploration and delineation (it certainly is our favorite!). In this article, we want to focus more on the “geo” part of geophysics and take a look at some resistivity values for common materials.
You see, ERI works best when you have a good knowledge of the geology of your survey area. In fact, when we’re helping new customers design their survey, or helping someone in the field—the geology of the area is one of our first questions.
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Single-Channel vs Multiple-Channel Systems
Posted by Sean on Mar 26, 2019
Our customers often want to get the most out of our equipment while sticking to their budget. As such, many will opt for a cheaper single-channel system instead of a multiple-channel system. When customers are weighing the options, we often get the question “What’s the difference between the two?”.
The simple answer? Speed.
Of course, there are a few more bells and whistles that a multi-channel system offers, but the key difference is how much faster it is when compared to a single-channel. That’s what we’ll focus on in this...
