Intergrating Application of Ambient noise seismic Technology and Deep-Penetrating Ground Penetrating Radar Technology in the Detection of Ground Fissures in Langfang City, Hebei

Ground fissures are a unique urban geological hazard. In recent years, China's ground fissures have increasingly attracted international attention due to their extensive coverage, large scale, and significant harm. These fissures severely restrict urban planning and construction, hinder economic development, and pose threats to the safety and property of the population. High-resolution detection and analysis of the causes of ground fissures are crucial for urban planning and disaster prevention and mitigation. Ambient noise seismic surveys have the advantages of continuous ambient noise sources, low cost, and fast deployment. These advantages are good for urban exploration. Ground penetrating radar(GPR), with its capability for rapid, non-destructive ultra-shallow subsurface detection, can achieve high-resolution imaging of underground structures within tens of meters below the surface. This study combines Ambient noise seismic method and deep-penetrating GPR method to investigate ground fissures in Donggugang Village, Langfang City. The seismic and radar profiles were calibrated and interpreted using borehole data near the survey lines, revealing the distribution and extension of the ground fissures underground. Based on the seismic and radar detection results, an analysis of the mechanisms causing the fissures was conducted, suggesting that the formation of the ground fissures in the study area is due to the combined effects of secondary faults extending westward from the Haihe fault and changes in the groundwater level.