Estudio magnético y de resistividad en los alrededores de la Pirámide del Sol, Teotihuacán, México
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The existence of tunnels and caves within the limits of the pre-Columbian city of Teotihuacan, Mexico is well known. A semi-natural tumel was discovered several years ago beneath the Pyramid of the Sun, ending in a four-lobed chamber. The presence of similar features in Oztoyohualco (NW of the city), led to suspect the presence of a network of tunnels beneath the city.
A geophysical survey was carried out initially to calibrate the instruments on known tunnels. Then geophysical data were used to define the tunnel continuation east of the pyramid. Total ï¬eld and magnetic gradient surveys were done in detail over a small plaza in front of the main stairway of the pyramid, along with a resistivity profile using a Wenner array (S-N direction) perpendicular to the structure. The reduction-to-the-pole filter was applied to the magnetic data to define the position on the surface of the tunnel. This allowed to compute a three-dimensional model that agreed with the resistivity survey.
A total field magnetic survey was performed and a series of high and low magnetic patterns were obtained. The anomalies were interpreted as magnetic signature of basaltic intrusives surrounded by caves partially filled with soil. A resistivity proï¬le was surveyed on one of these patterns. A couple of resistivity highs were found that corresponded to the position of two caves. This result was confirmed by exploratory drilling. The anomaly was modeled with a set of three-dimensional prisms, according to the results provided by the drills and the resistivity profile.
The results suggest an extension of the tunnel beneath the Pyramid of the Sun in the E direction and lend plausibility to the existence of a network of tunnels beneath the city.