Accurate groundwater surveys with sTEM

The sTEM geoscanner

The sTEM makes Groundwater mapping easy

The sTEM geoscanner delivers efficient, reliable groundwater surveys. It conducts single-site measurements, capturing data that reaches depths beyond 500 m (1650 ft). Affordable and robust, the sTEM geoscanner is operated via an Android or iOS app and offers valuable insights into groundwater resources. The sTEM ensures efficient surveys with reliable performance. Its transmitter capacity enables robust measurements, covering a substantial area per station.

Designed for convenience, the lightweight and portable sTEM geoscanner, with transmitter wire and receiver cable, weighs approximately 17 kg (37 lb). It can be easily transported in a solid shipping box as check-in luggage on airplanes. With Wi-Fi and internet connectivity, enjoy seamless data upload and remote support.

The sTEM system comes with these options:

  • 20 x 20 m (65 x 65 feet)
  • 40 x 40 m (131 x 131 feet)
  • 80 x 80 m (262 x 262 feet)

Unique features of the sTEM 5, 10 and 20 instruments

  • Dual moment system for shallow and deep information
  • Integrated Tx and Rx hardware in one unit
  • Transmitter loop size: 20 x 20 m,  40 x 40 m or 80 x 80 m options
    (65 x 65 feet, 131 x 131 feet,  232 x 232 ft))
  • Active current regulation, 1 A low transmitter moment
    5/10/20 Amp high transmitter moment
  • Depth of investigation: Up to 500 m (980 ft)
  • Power supply: Two 14,4 V lithium batteries at 99 Wh each. Three with sTEM20 corresponds to a full day of operation
  • Total weight (including transmitter and receiver coils): around 17 kg (37 lbs).
  • Portability: Shipping box for convenient airplane check-in.
  • Connectivity: Wi-Fi and internet for remote support and upload of data to the cloud
  • Operated by Android and iOS App
  • Suppression of external noise by tapered gating
  • Real-time data stacking and calculation of data certainties
  • Automatic sign correction of data
  • Real-time data inversion

Download sTEM Product Description

Download sTEM Product Spec Sheets

“"We've wrapped up the field work here in Kakuma. I got to say, excellent work with the sTEM. You guys have really built an incredible system. The Kenyans, with no geophysics experience, can collect data without support after maybe 2 or 3 sites. They were able to measure at a site, start to finish, in 10 mins 20 seconds. And the app is really easy to use. One of them asked if sTEM stood for simple TEM because it was so easy."”

Denys GrombacherAssistant Professor, Aarhus University
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Read our Case Studies

Dike Assessment – Netherlands

Read about the survey that was carried out in order to test the usability of the tTEM geoscanner in earth dike safety assessment. The presence, thickness and lateral extent of a thick clay layer was used to assess the safety in a spatial concern.

Borehole Siting – Togo

Get insights on the well-siting campaign that was carried out in Togo in 2022 using tTEM which resulted in recommendations of multiple borehole sites. The tTEM results located several fracture zones which resulted in very successful boreholes.

Aquifer Recharge – USA

Using tTEM to assess feasibility: Managed aquifer recharge, where excess water is used to recharge the groundwater aquifers, has been proposed as a means of curbing groundwater depletion in the Central Valley. However, locating new fields for recharge is difficult.

Characterizing Rivers – USA

Data were collected to achieve high-resolution information about subsurface geologic structure that can be used to delineate fresh-water/saline water contacts, delineate aquifer materials for water-resource investigations, and to inform hydrogeologic models.

Well Siting – Tanzania

Learn more about the well-siting campaign carried out with our tTEM system. The first target was a location with a potential for a thick unconfined aquifer to be present, while the second target was a confined aquifer system at greater depth, present in boreholes from nearby villages.