Welcome to Geotech!
What Is an ERT Instrument? A Comprehensive Guide to Electrical Resistivity Tomography, High-Density Resistivity, and DC Sounding
Part 1: What Is an ERT Instrument?
Definition:
An ERT (Electrical Resistivity Tomography) instrument is a geophysical tool that maps subsurface resistivity variations by injecting electrical currents into the ground and measuring voltage differences. It combines advanced data acquisition and inversion algorithms to generate high-resolution 2D/3D images of geological structures.
Key Technologies:
- High-Density Resistivity (HDEM): Uses multi-electrode arrays for dense data sampling.
- DC Sounding: Vertical profiling for depth-specific resistivity measurements.
- Induced Polarization (IP): Measures chargeability to identify conductive minerals or fluids.
Part 2: Method Comparison
| Parameter | ERT | High-Density Resistivity | DC Sounding |
|---|---|---|---|
| Data Dimension | 2D/3D Imaging | 2D Cross-Sectional | 1D Vertical Profiling |
| Resolution | Millimeter-level | Centimeter-level | Meter-level |
| Noise Resistance | High (Filters electromagnetic interference) | Low (Sensitive to noise) | Moderate |
| Best For | Faults, caves, complex structures | Aquifer mapping, soil layering | Mineral deposits, bedrock depth |
Part 3: Applications & Case Studies
1. Groundwater Exploration
- Case: In a mountainous region, ERT identified a concealed aquifer, enabling a 300% increase in well yield.
- Why ERT?: Distinguishes water-bearing zones from impermeable layers.
2. Landslide Monitoring
- Case: Real-time ERT detected pore pressure changes in a highway slope, predicting a landslide 48 hours in advance.
- Why ERT?: 3D imaging tracks dynamic subsurface movements.
3. Archaeological Surveys
- Case: Non-invasive ERT mapped hidden chambers in an Egyptian pyramid without excavation.
- Why ERT?: Preserves cultural heritage while revealing subsurface structures.
Part 4: Data Processing Techniques
- Forward Modeling: Simulates theoretical resistivity responses based on geological models.
- Inversion Algorithms: Convert raw data into actionable images (e.g., Geotech’s RESOLVE software).
- Validation: Cross-checks with borehole logs or seismic data.
Part 5: Why Choose Geotech ERT Instruments?
- Precision: Measures resistivity down to 0.1 Ω·m with depths up to 500 meters.
- Versatility: Integrates IP modules for simultaneous chargeability analysis.
- User-Friendly: Automated workflows and real-time data visualization.
【Intelligent exploration equipment recommendation】
Unlock New Heights in Geophysical Exploration: Geotech GIM Series High-Density Resistivity and IP Testing System
As a leading multi-functional electrical exploration device, the GIM Series integrates natural potential measurement, 1D/2D/3D resistivity imaging (ERT), and induced polarization (IP) capabilities. With 24-bit high-precision A/D conversion and bi-directional cascading technology, it breaks traditional electrical exploration depth limitations, achieving 1,500-meter penetration. The IP67 waterproof design and wide operating temperature range of -20°C to +60°C ensure stable performance in extreme environments.
Key Advantages
✅ Multi-Scenario Adaptability: From groundwater pollution monitoring to ore body location, it supports cross-hole, underwater, and 3D distributed cabling.
✅ Intelligent Efficiency Boost: 10-channel synchronous acquisition + rolling measurement mode captures multi-electrode data in a single setup.
✅ Data Compatibility: Exports TXT/Excel formats compatible with mainstream inversion software (Res2DInv, EarthImager).
Discover How the GIM Series Can Revolutionize Your Projects
Learn more about the GIM Series and how it can overcome geological exploration challenges:
https://geotechcn.net/products/electrical-instrument/gim-1-single-channel-intelligent-resistivity-ip-meter%e4%b8%a8high-density-resistivity-tester/
(Click the link to access technical specifications, application case studies, and global support services.)
