Page 6 - Demo

2076 | Geof%u00edsica Internacional (2026) 65-2For the 2D models of the magnetic anomaly, the residual effect was derived from its power spectrum, followed by the execution of Pole Reduction (PR). The generated map serves as the foundation for the derivative applied in \that may align with the orientation of the predominant faults in the study area, and subsequently tracing lineaments (possible geological limits, faults or fractures), as well as delimiting edges and areas of high gradient to facilitate integration and to be able to relate to these geological structures. Next, the Analytical Signal filter was applied to the base map to correlate the magnetic response of the prevalent materials in the study area and to identify Aeromagnetic Domains (AMD's). The residual effect of the Bouguer anomaly was extracted from its power spectrum, and the vertical derivative was applied to emphasize surface anomalies potentially associated with the terrain and, in certain instances, with previously identified geologic structures.Two polygons were generated for the 3D modeling, concentrating on the sampling points (Ply1 and Ply2). The initial polygon (Ply1) has an area of 225%u00a0km2, and the 3D model obtained from this polygon and the terrain%u2019s topography possesses a volume of 1236.15%u00a0km3, a thickness of 5.494%u00a0km, and a resolution of 500%u00a0m. Utilizing 300 real data points for the inverse model of the Magnetic Anomaly and 20,097 real data points for the inverse model of the Bouguer Anomaly.The second polygon (Ply2) encompasses an area of 48.61%u00a0km%u00b2, yielding a 3D model with a thickness of 3.527%u00a0km and a resolution of 250%u00a0m, utilizing 55 real data points for the inverse model of the Magnetic Anomaly.5. Results5.1. HydrogeochemistryThe findings indicate that the wells with elevated arsenic concentrations specifically HA, SPFM, P2, P5 and Detzani (from 0.029 to 1.212%u00a0mg/L of arsenic in drinking water), located in the central zone of the municipality, surpassed the permissible limit stipulated by NOM-127-SSA1-2021 and the WHO guidelines for drinking water (Table 2).All wells exhibit a pH range of 7.15 to 7.98, indicating that the groundwater traverses an alkaline environment.The sampling points situated in the Moctezuma River basin (fractured Cretaceous limestones, [Armienta et al., 2001]), including P2, P5, Detzani, SPFM and Muhi, display intermediate electrical conductivity values ranging from 424 to 692%u00a0%u00b5S/cm and exhibit a marginal rise in temperature, Muhi representing the upper limit of this range at 31.84 %u00b0C. The noria (shallow well) HA records a relatively low temperature with a high E.C. (740%u00a0%u00b5S/cm) similar to the rest of the deeper wells. While in Manantial Jal, despite recording the highest arsenic concentration and the maximum electrical conductivity value (2850%u00a0%u00b5S/cm), the measured temperature was 22.35 %u00b0C, which is comparable to the average air temperature in that time of the year (22 %u00b0C).On the other hand, the wells situated in the Tula River basin (volcanic setting) and a small portion of the Moctezuma River basin, including La Cruz and LCR, exhibit slightly elevated temperatures, ranging from 22.74 to 26.9 %u00b0C, without exceeding Table 1. Catalog of sample locations in the Zimap%u00e1n region, Hidalgo.Code Name Type of structure UTM X (mE) UTM Y (mN) Elevation (m.s.n.m.)Well depth (meters)Estimate d depth S.W.L.(meters)Detzani Detzani Well 485409 2134773 1829 %u224890 %u2248 70P2 Pozo 2 Noria 460596.1 2293517.9 1793 30 N/AP5 Pozo 5 Well 460718 2293704.6 1802 125 %u2248 67HC Heroico Colegio Well 460557.4 2293394.8 1790 18 %u224818HA Hotel %u00c1nyelo Noria 460070.6 2293268 1743 11 11El Muhi El Muhi Well 462728.9 2292981.1 1790 200 %u2248100SPFM San Pedro Fosforita M%u00e9xicoWell 465049.72 2293300.19 1840 200 %u224825LCR L%u00e1zaro C%u00e1rdenas RemediosWell 465084.92 2287922.29 1862 %u224890 %u2248 80La Cruz La Cruz Well 465275 2276061 1625 300 %u224890Mananti al Jal Mananti al Jal Spring 458320.1 2292892 1747 N/A N/AData with symbol %u201c%u2248%u201d were estimated from indirect measurements with PQWT -TC500 water detector.