Case Study/Deep Geothermal Exploration in Zhejiang: Unveiling 2.3 km Fault Structures via GN309 Nodal Seismographs
Sep 17,2026
⛰️ Deep Geothermal Fault Imaging up to 2.3 km
In a recent geothermal exploration project in Zhejiang, China, GN309 nodal seismographs were deployed to investigate deep fault structures related to geothermal resources using ambient-noise surface-wave methods.
Project overview:
📍 Location: Zhejiang, China
🎯 Objective: Geothermal resource exploration
🟦 Equipment: 13 × GN309 nodal seismographs
📐 Array: Four concentric circular arrays (radii: 150 m / 300 m / 450 m / 600 m)
🎧 Sensors: 2 Hz broadband geophones
📡 Real-time QC: 4G live data monitoring
The microtremor profile (azimuth 345°) reveals a pronounced low-velocity distortion zone between 2400–2500 m, at depths of 900–1300 m, interpreted as a fractured or water-rich fault zone.
By integrating phase velocity and apparent S-wave velocity sections, a deep fault (F1) was clearly identified.
The fault initiates near station 2100, extends downward along a low-velocity gradient, penetrates the full investigation depth (~2.3 km), and dips steeply northward—consistent with a branch of the Xiaoshan–Qiuchuan fault system, merging at depth.
🎥 The accompanying video demonstrates the surface-wave processing workflow, showing how GN309 enables reliable deep fault imaging and geothermal targeting, even under complex geological conditions.
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