GS201 Distributed High Precision Land Seismograph (MASW, REMI, eSPAC)
The GS201 features a 32-bit Σ-Δ ADC supporting up to 4,000 channels at 1 ms sampling, scalable to tens of thousands for large 2D/3D surveys. Its modular design—industry PC, master, cross, and acquisition stations—offers a lightweight, flexible setup for depths ranging from a few meters to several kilometers. It is ideal for reflection, refraction, MASW, REMI, eSPAC, seismic imaging, vibration monitoring, pile testing, and shear-wave profiling. Widely applied in infrastructure, hazard assessment, groundwater studies, and resource exploration including oil, gas, coal, and minerals.
OVERVIEW
Description
GS201 Distributed High-Precision Land Seismograph (Software Included)
Support 8 to 4,000 channels | 32bit ADC | Optional 4.5Hz/14Hz/40Hz geophones
The GS201 Distributed High-Precision Land Seismograph is a next-generation system designed for advanced seismic exploration. Built on a 32-bit high-precision Σ-Δ ADC, it supports up to 4,000 channels with a 1 ms sampling interval. Therefore, it is well suited for large-scale 2D and 3D surveys with tens of thousands of channels.
The system integrates an industrial-grade PC, master station, cross station, and acquisition station. Its configuration is lightweight, flexible, and easy to deploy. Exploration depths can range from a few meters to several kilometers, allowing both shallow and deep investigations.
Users can apply the GS201 in many ways. It supports seismic reflection and refraction studies, surface wave analysis, pile foundation inspection, seismic imaging, vibration measurement, and shear-wave velocity profiling. This versatility makes it useful for both engineering and resource exploration.
The GS201 is widely used in engineering geology, including projects in water conservancy, power, transportation, bridges, tunnels, and urban development. It is also applied in resource exploration such as groundwater, oil, coal, coal-bed methane, shale gas, and metallic or non-metallic minerals. Laboratory and field testing show that its performance meets international standards, with some parameters leading globally.
Typical Configurations
- Shallow Seismic Surveys: 24, 48, or 96-channel distributed systems for refraction and surface wave studies.
- Engineering and Resource Exploration: 96–2000 channel systems for 2D engineering applications and 3D resource exploration.
Surface Wave & Ambient Noise Methods
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MASW (Multichannel Analysis of Surface Waves)
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Extracts shear-wave velocity (Vs) profiles for site classification (e.g., Vs30).
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Provides detailed stiffness and layering information for engineering and seismic hazard studies.
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Directly supported through the GS201’s multi-channel surface wave recording capability.
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REMI (Refraction Microtremor)
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Uses ambient seismic noise (microtremors) for shear-wave velocity profiling.
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Effective in noisy urban or restricted areas where active sources are not feasible.
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Fits under the GS201’s vibration measurement and surface wave analysis functions.
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eSPAC (Extended Spatial Autocorrelation Method)
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Uses ambient noise arrays to determine dispersion curves and subsurface velocity structure at greater depths than standard SPAC.
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Complements MASW/REMI for deep shear-wave velocity profiling (hundreds of meters).
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Well-suited for urban seismic microzonation and large infrastructure foundation studies.
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✅ GS201 can support MASW, REMI, and eSPAC in addition to reflection, refraction, pile testing, seismic imaging, and vibration monitoring. Together, these broaden its use from shallow geotechnical site characterization up to regional seismic hazard and resource exploration surveys.
To learn more about MASW, and ESPCA, read our blog HERE.
APPLICATIONS
Foundation, Subgrade, and Engineering Geology
- Cavity detection, lava flow mapping, and soil classification.
- Bedrock depth estimation and structural anomaly surveys.
- Roadbed and RCC quality checks, plus reinforcement evaluation.
Tunnel Projects
- Route alignment and surrounding rock classification.
- Lining inspection, bottom-of-tunnel checks, and vibration monitoring.
Large and Medium-Sized Reservoirs
- Dam integrity and hidden defect detection.
- Sedimentation surveys and dredging effectiveness evaluation.
Bridge Projects
- Pier and abutment foundation surveys.
- Pile concrete quality testing and vibration monitoring.
Environmental and Geological Hazards
- Landslide, karst, mined-out area, and active fault surveys.
Mineral Exploration
- Prospecting for metallic and non-metallic resources.
Energy Resources Exploration
- 2D and 3D exploration for coal, coal-bed methane, shale gas, and oil.
Connection Diagram

SPECIFICATIONS
GS201 Mainframe
- Operation platform: Industrial laptops with major indexes reaching standards of military products
- Operation system: Windows XP
- File format: Supports SEG-2, SEG-Y, SEG-D
Master Box
- Interface functions: Industrial laptops with major indexes reaching standards of military products
- Working voltage: 10~15V
- Power consumption: 2W
- Storage temperature: -40~85℃
- dimension: 200*150*70 mm
- Weight: 2.5KG
Cross Box
- Working temperature: -40~70℃
- Working Voltage: 10~15V
- Storage temperature: -40~85℃
- dimension: 200*150*70 mm
- Weight: 2.5KG
- Interface functions: Monitoring of station voltage, temperature, etc.
Acquisition station
- Analog-to-digital converter: 32-bit ∑-△ADC
- Sampling: 4ms,2ms,1ms,0.5ms,0.25ms,0.125ms,62.5μs,31.25μs,15.625μs
- Pre-release gain: 0, 6, 12, 18, 24, 30, 36 dB
- Synchronous correction: <1μs
- Noise: 1.20mv (sampling interval 1ms, pre-release gain 0dB); 0.11mv (sampling interval 1ms, pre- 36dB)
- Single-channel power consumption: Operating mode 0.25W; standby mode 0.10W
- Dynamic range: >124 dB
- Harmonic distortion: <-112 dB
- Gain accuracy: <0.1%
- Common-mode rejection ratio: >110 dB
- Differential input impedance: 20KΩ/50nF
- Full amplitude input: 3.75 Vpp
- Stopband attenuation: >140dB
- Working voltage: 10~15V
- Storage temperature: -40~85℃
- Working temperature: -40~70℃
- Common-mode input impedance: 100KΩ
- Weight: 2.5kg
- dimension: 200*150*70 mm
- Interface functions: Monitoring of station voltage, temperature, etc.
Key Functions
- Mainframe
- Instrument parameters to configure performance indicators
- Real-time status monitoring of original cases
- Data storage, display, drawing and printing
- Main control station
- Issues orders
- Receives data uploaded by the cross station, and transmits to the mainframe through the network port
- Earthquake source interface
- Monitoring of station voltage, temperature, etc.
- Cross station
- 2D and 3D measuring line gathers data and also serves as a collection station
- Monitoring of station voltage, temperature, etc.
- Cross station
- Supports 2-channel, 4-channel, 6- channel- and 8-channel configuration for single station
- 32-bit analog-digital conversion
- Self-test indicators
- Monitoring of station voltage, temperature, etc.
Case Study
Case Study: Huaye Regional Earthquake Safety Assessment
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Location: Ma’anshan, Huaibei, Suzhou, and Hefei (China)
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Duration: October 4 – December 8, 2020
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Weather: Sunny to cloudy conditions
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Equipment: GS201 Distributed High-Precision Seismograph
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Survey Parameters: 72-channel acquisition, 4 m channel spacing, 48 m offset, 6-fold coverage, 24 m shot spacing, 2 kHz sampling rate
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Outcome: Bedrock surface and Quaternary stratigraphy matched existing data, supporting a reliable regional earthquake safety evaluation.





















