## 6 Interpretation and Results  
### Line 1 and Line 2  
The length of the L1 survey line measures 570 m, with 19 measuring points spaced at intervals of 30 m. L1 is running from SW-NE with an azimuth angle of 57 degrees. Based on the findings obtained from the inversion of the electric sounding analysis of the L1 line, there is a hypothesis suggesting the presence of a fault in the northwest direction, which is believed to traverse in close proximity to the measuring point 255. The electric sounding results clearly indicate the presence of a shallow anomaly characterized by low resistivity. Additionally, it is evident that the resistivity gradually increases to a value exceeding 400 ohms.m at a depth of approximately 100 m. Based on the available evidence, it can be deduced that there exists a proficient water-conducting fault in this particular region. Additionally, the presence of a contact surface between the mud and sand layers suggests the likelihood of a well-developed aquifer (Figure 7). The length of the L2 line measures 640 m, with 16 measuring points spaced at intervals of 40 m. L2 is running NW-SE with azimuth at an angle of 105 degrees. The F2 fault is hypothesized to extend from No. 160 to 240 along line L2. The resistivity sounding data reveals a V-shaped low resistivity anomaly zone. This anomaly exhibits considerable thickness, exceeding 200 m. The observed low resistivity anomaly in the vicinity of this measurement location is believed to be primarily attributed to the presence of argillaceous slate. The presence of a resistivity interface at this specific measuring point suggests the likelihood of it being the contact surface between argillaceous slate and quartz sandstone strata. Additionally, it is hypothesized that there may be water-bearing cracks within this contact surface. Through the geophysical exploration work carried out in Nanshan Township, Huarong County, five verification boreholes have been constructed so far. During the advanced phase, verification holes ZK05, ZK01, and ZK02 are strategically positioned in close proximity to measuring points No. 120, 160, and 220, respectively (Figure 8). The verification results  
Figure 7: Line 1 (**a**) shows the resistivity distribution with depth and (**b**) shows the hydrogeological profile of the survey line. indicate that the slate containing a significant amount of clay minerals is predominantly found at a depth of 100 m. Furthermore, it should be noted that as the slate descends to a depth of 100 m, there is an observable increase in the proportion of sandy composition. A discernible compressive phenomenon is observed at the interface, resulting in the formation of fractures within the underlying sandy stratum. The subsequent pumping test reveals that the ZK01 well has a maximum water output of approximately 460 tons, the ZK02 well has a maximum water output of approximately 170 tons, and the ZK05 well has a maximum water output of approximately 100 tons. It is speculated that the change in water output is due to the F2 fault on survey line L2. The well structure of ZK01 is presented in (Figure 9), while the hydrogeological profile of the lithological log and the surrounding research area are presented in (Figure 10). The selection of the location for the ZK03 verification hole is primarily based on the information obtained from the ZK01 and ZK02 verification holes, as well as the analysis conducted above. It is presumed that the F-NW1 fault passes through the chosen location of the verification hole in a northwestern direction. The electric sounding results indicate a clear presence of a shallow low-resistivity anomaly. Additionally, the resistivity at a depth of 100 m exceeds 400 ohms.m, suggesting the existence of a well-conductive fault in the study area. It is further hypothesized that a contact zone between layers of mud and sand textures is present, indicating the likely presence of a productive aquifer.