China's 4G-enabled seismographs enable emergency detection of floods and landslides in Nanning, Guangxi: solving underground challenges and delivering impressive results
Nov 25,2025
Recently, a large-scale ground collapse occurred near No. 22 Jiangbei Avenue in Nanning City due to heavy rainfall brought by a typhoon, drawing widespread attention.
Nanning municipal management departments used ground-penetrating radar (GPR) vehicles to conduct preventative cavity detection at the collapse site and surrounding roads on Jiangbei Avenue. However, limited by the maximum penetration depth of GPR (approximately 4 meters), they were unable to determine the deep structure. To investigate the cause of the collapse and promptly eliminate potential hazards, the Guangxi Earthquake Administration quickly dispatched 100 Guowei UGL-3C short-period 4G seismographs to the site. Three two-dimensional seismic lines were deployed along key areas of the Jiangbei Avenue collapse zone. Using micro-motion imaging technology, on-site exploration was conducted, successfully obtaining two-dimensional velocity profiles at depths exceeding 30 meters. This accurately captured the distribution characteristics of underground cavities and weak layers, providing data support for on-site disaster relief and rescue efforts.
Our seismographs are deployed in the subsidence area
The results clearly show a significant low-velocity anomaly zone beneath the road collapse area (marked in red in the image). It is speculated that groundwater, affected by typhoons and floods, infiltrated along weak layers, damaging the soil structure beneath the road and rendering it unable to support the overlying strata, thus triggering the collapse. Furthermore, a potential low-velocity weak layer (marked in blue in the image) was also discovered near the collapse area. This structure may provide a channel for floodwater infiltration towards the urban area and is an area requiring close monitoring in subsequent disaster prevention and relief efforts.
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