The plausible northern extension of the Los Humeros Caldera Geothermal Field and the correlation of density and electrical resistivity within the collapsed structure are explored in this study. The Los Humeros Caldera, located on the eastern portion of the Trans-Mexican Volcanic Belt, is a Pleistocene caldera with at least two eruption episodes. The caldera's volcanic activity has been determined from 0.46 Ma to the present, producing large quantities of ignimbrites and limestone formations. Geothermal studies aim to locate sources and understand the caldera's structural characteristics, with the current generation of electrical energy exceeding 90 Mwe. The deep fluids in the caldera reach temperatures over 350°C, making the location of deep heat sources and their relation to surface structures vital for understanding the geothermal system's evolution. The study provides a high-resolution gravimetric base map of the Los Humeros Caldera, covering a larger and denser area than previous surveys. The research explores coincidences and discrepancies with geologic and electrical resistivity data from magneto-telluric surveys. Geological studies, including isotopic and geochemical data, have been conducted, and accounts of variations due to geothermal field exploitation are available. Geophysical studies, focusing on seismicity, gravity, magnetics, and tellurics, have also been reported. The GGMplus gravity model is used to create density models up to 6 km depth, and density cross-sections are extracted. The models are compared with geological sections and electrical resistivity models obtained using the magneto-telluric method. The study highlights the importance of understanding the structural characteristics of the caldera for geothermal energy generation and the evolution of the geothermal system. The northern extension of the caldera is proposed, and the correlation of density and electrical resistivity within the collapsed structure is analyzed, providing insights into the geothermal field's characteristics and potential.
