Innovation and Reliability Since 1980

Quantum V7

Dear Colleague:

Welcome to Quantum, a periodic e-newsletter for professionals working with magnetic technologies. Quantum is designed to keep you up to speed on applications, case histories, and evolutions of quantum magnetometers in a variety of disciplines.


Complete Our 10 Minute Survey – And Win a Chance for a Mini Digital Video Camera

3.1M DigiGR8 DV-182 Mini
Digital Video Camera Camcorder

Have you ever wondered, “How do companies determine priorities for new product development and client servicing?” The best way we know is to go directly to the source … our customers … who are working on a daily basis with technology and who have great insights into functional enhancements!

So, now, we’re asking for your help. We would like to be able to include your thoughts into upcoming product and other developments. That’s why we have prepared a short online survey … that should take no more than ten minutes of your time to finish.

The survey is also set up to allow you to enter your name into a random drawing for a Mini Digital Video Camera … the world’s smallest such device according to the manufacturer. Odds of winning are good, so we wish you good luck with your entry.

To get started, simply click here and the survey will load into your web browser automatically. Note that entries MUST BE RECEIVED by Friday, July 15 at 5:00pm Eastern Standard Time. GEM employees and employees of GEM’s agents / representatives are not eligible for the prize draw.


Customer Service – Update Your Warranty Online for Fast Access to Updates

GEM is pleased to offer the longest warranty in the geophysical instrumentation industry as a demonstration of its confidence in the quality of its products. All GEM products are waranteed to the original purchaser against defective parts and workmanship for two (2) years from the date of original shipping. A summary document of the precise TERMS and CONDITIONS is provided at

As part of its customer service program, GEM recently implemented an Online Maintenance capability for all customers using its magnetometers. Click the link above and you will also see a series of entry fields at the bottom of the form. Simply complete the form and submit and your warranty will be forwarded directly to us.

Then, you will be all ready for any updates that GEM prepares – a timely way to acquire new and upgraded features via the Internet.


Airborne Magnetometers – GEM’s Unique Tridirectional Helicopter System

Tridirectional Sensor with Helicopter
and Sample High Resolution Data

The Tri-Directional Helicopter Gradiometer from GEM was the first three-axis gradiometer developed globally. Since its inception in the mid 1980s, the system has been outfitted with optically pumped Potassium sensors and has evolved into a reliable platform for different applications, including mineral exploration.

This special gradiometer consists of a three-armed towed bird configured with 4 sensors for calculation of magnetic gradients, including vertical and horizontal across and along track gradients. Additional components include GPS for accurate positioning of the bird during flight. Data capture is either to the GSMP-30A acquisition console or a 3rd party unit.

EAGE’s First Break is publishing a paper on the Tridirectional system in its July, 2005 issue. This paper reviews the principles of optically pumped Potassium magnetometers and the Tri-Directional Gradiometer, continuing with a discussion of Tri-Directional Design considerations, and concluding with a discussion of the role of magnetic gradients in mineral exploration (and other applications). To access your copy, click here.


Archaeology – A Visit to the North American “Pyramids” + Tips for Practitioners

The Mounds Site, Chilicothe, Ohio

GEM has written a short paper to summarize the recent proceedings of the National Parks Service Archaeology Workshop in Chillicothe, Ohio. The Workshop held May 16 to 20, 2005 brought together many of the top instructors and students in the United States to learn about the state-of-the-art in geophysical surveying and methods, such as magnetics. Morning sessions of this exciting workshop dealt with the theoretical and practical aspects of geophysics; afternoon sessions were spent at one of three sites in the Chillicothe area.

Chillicothe is of much interest to archaeologists as it was the site of a civilization that inhabited the area from approximately 300 B.C. to 600 A.D. Had the native features in the area not been largely destroyed through farming, it was postulated by one group leader that the Chillicothe site would have been the equivalent of the “North American Pyramids”. The site was purchased by the National Parks Service over the last decade or so, and as such, there is now a huge area to test to determine the properties of the subsurface … the main record that remains intact.

To download your copy of the paper, which provides Geophysical Tips for archaeological practitioners, click here.


Earthquake Prediction – SuperGrad System Installed in Mexico

GEM Personnel Shown with Sensor
Cover (white drum to left), Sensor Cable,
Sensor with Protective Heat-Resistant
Covering, and Instrumentation Box

Interest continues to be expressed in GEM’s SuperGrad system for earthquake prediction monitoring and research. The latest example is the Mexican group, Universidad Nacional Autónoma de México (UNAM), which recently installed a SuperGrad system with technical assistance from GEM.

The proposed site near the coast in the state of Oaxaca was first surveyed with a GSM-19WG Gradiometer. This information was used to select sensor locations (i.e. in locations with very small gradients for best resolution of earthquake signals). Other steps in the procedure were to:

  • Install concrete pillars for supporting sensors (1 day)
  • Install sensors and cabling (1 day)
  • Configure electronics boxes (1 day)
  • Set up power supply, comprising solar power and batteries (2 days)
  • Test system (1 to 3 days)

The next steps in the process are to monitor telemetered data with the aim of spotting potential precursors to earthquakes or other responses that may help characterize earthquakes magnetically. Results will be reported periodically in Quantum and on GEM’s web site (


Mineral Exploration – Many Real World Case Studies Now Online

One of the best ways to understand the advantages and disadvantages of different geophysical methods for specific earth science challenges is through case histories.

Since May 2004, GEM has been meticulously tracking press releases to determine whether there is information of value to our GEM user community. Happily, there are some interesting results with a variety of deposit types — ranging from diamonds to gold to base metal exploration.

To access your copy of these case histories, you simply need to read GEM’s Blog (an electronic diary containing original versions of press releases. This information can be invaluable in determining which magnetometer to use as well as the advantages and limitations of magnetics in certain applications.

For more information, please visit


Observatories – China Earthquake Administration (CEA) To Take Delivery

The Chinese Earthquake Administration is taking delivery on a substantial order for GSM-90 EUROMAG magnetometers. The systems will be employed across China as part of its earthquake monitoring program. CEA ordered the GSM-90 F1 model, so called because it samples up to one sample a second (standard monitoring period described by geomagnetic organizations and bodies, such as Intermagnet.


NEW Systems – Getting Started with V7.0 + Documentation Changes

GEM’s new version 7.0 magnetometers and gradiometers offer a number of benefits for existing users and for customers considering a purchase. These include:

  • Data Import (import using lines easily as per Geosoft, Encom, Intrepid standards)
  • Programmable Export Format (fully control data export)
  • Picket Marking / Annotation (annotate relevant positions easily in the field for later interpretation)
  • GPS Elevation (provides “Z” data for numerical modeling)
  • Enhanced Positioning Resolution (desirable for higher resolution surveying)
  • USB Adapter (transfer data easily from console to latest version Personal Computers)

There are also other features included as part of the release. To access a summary of the features noted above and to view relevant documentation changes, please click here. A release document will be provided for your quick review.


Magnetometers and Gradiometers – Latest Trends

New technologies offer data quality and high sampling for effective decision-making. Some of the leading technology-movers are the magnetometer and gradiometer – both ground and airborne – which continue to evolve through persistent, progressive and productive research and development (R&D). GEM is at the forefront of these developments — reinforcing the company’s reputation as the sector’s most dynamic magnetic technology provider.

For those of you who work with magnetic technologies regularly, you will recognize that changes in magnetometer and gradiometer systems are occurring both on the ground and in the air – with changes reflecting industry needs in the modern exploration era. To learn more about evolutions in ground and airborne magnetics, click here.


Communicating with You – Introducing “Magnetic Moments”, Our Short E-Notes

GEM is pleased to prepare its Quantum E-newsletter and distribute it approximately three to four times a year. However, we find that changes in technology and methods are changing rapidly; and it is more appropriate to communicate more frequently … on a just-in-time basis, as soon as we become aware of new technologies and changes.

For this purpose, we have developed a new communication vehicle, that we affectionately call, “Magnetic Moments.” The name is, of course, has a double meaning; referring to both the definition of a moment as “a vector relating the aligning torque in a magnetic field experienced by the object to the field vector itself” and also, the timeframe for reading GEM’s Magnetic Moments.

Magnetic Moments are intended to be very short reviews of technology that provide a complete, yet concise description of a topic. Sample topics include:

  • How Deep Can My Magnetometer See?
  • Six Most Critical Challenges in Ground Magnetometer Surveys
  • Your Magnetometer: Three New Tricks for a Tried-and-True Method
  • … and More …

We now envision publishing three to four issues of Quantum along with six to eight issues of Magnetic Moments per year … with the goal of providing you, our customer, with the most up-to-date information possible about the state of the magnetometer industry and the ways in which you can use your system most effectively.


The Last Word – Comments from Our Customers

As usual, we leave the last word to our customers – our key focus in ensuring that we continue to serve the market effectively and to our customers’ satisfaction.

“We have recently purchased the GSMP-40 Potassium Gradiometer from GEM Advanced Magnetometers for the Colorado School of Mines. The GSMP-40 has proven valuable for both independent research applications and especially for educational purposes. The ability of the GSMP-40 to rapidly gather high quality data has helped Mines keep our students on the leading edge of both applied and theoretical aspects of magnetic and magnetic gradient methods for geophysical exploration. Likewise, the gradiometer has proven valuable for quickly identifying underground utility targets on the Mines campus, where construction plans require knowledge of these targets in advance.

In addition to the quality of the GSMP-40 gradiometer, I have found the quality and service of GEM Advanced Magnetometers staff to be wonderful. They have taken all comments, questions, concerns and requests seriously and have acted in a timely maner on each. In particular, they have gone above and beyond traditional support center obligations by immediately modifying the magnetometer’s software design at our request to improve data output quality and ease of teaching for large numbers of students.”

Richard Krahenbuhl
Ph.D. Candidate
Colorado School of Mines

“We took our GSMP-40 to North Dakota for a field project this summer andit worked wonderfully. Our intent was to compare the data recovered with the GSMP-40 to that recovered with a fluxgate gradiometer earlier. The GSMP-40 was MUCH faster and collected the data in a fraction of the time.”

Dr. Tommy Ike Hailey
Northwestern State University

“We have four of your Overhauser magnetometers, GSM-19 (Standard Overhauser) and GSM-90 (EUROMAG). We are very satisfied with them, and are now considering buying more.”

Bjorn Ove
Auroral Observatory
University of Tromso

“We have had the GSM-19T (Proton) instrument for the last 5 years. It is giving very good results.”

Dr.Vinit C. Erram
Indian Institute of Geomagnetism

Good website!”

Jamal Mbarak
Shatry Gems Ltd.

Important Note: Our goal is to only communicate with people who would like to hear from us. If you would like to stop your subscription, please click here. If you have received this message through a colleague and would like to beadded, please click here.

Copyright 2005. GEM Systems, Inc. Advanced Magnetometers. All rights reserved with the exception of organizations that have contributed links to this issue. Our thanks to the contributors who have made this edition possible, and who are identified in the text of related articles or through their company websites. Note that some quotes relating to industry-specific trends may have been obtained from public-domain sources, and are not intended to promote GEM Systems, Inc. Other examples may not necessarily reflect GEM products; rather these examples are intended to illustrate the use of magnetics and magnetometry for selected applications.



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