2020
DOI: 10.1093/gji/ggaa338
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Shallow structure of Los Humeros (LH) caldera and geothermal reservoir from magnetotellurics and potential field data

Abstract: Summary This study focuses in the analysis of the internal structure of the upper 3 km of Los Humeros caldera and the relation of electrical and hydrothermal anomalies. For this purpose, we measured, processed, and interpreted 78 broadband magnetotelluric (MT) soundings. We performed a 3D inversion of the data set (ModEM) using all MT soundings, although only half of the available frequencies per sounding due to limited computed power. We also carried out the 2D inversions (NLCG) of the invarian… Show more

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Cited by 15 publications
(6 citation statements)
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“…There are two MT field data, those acquired in the CeMie-GEO project (Arzate et al, 2018), and those measured in the GEMex project (Benediktsdöttir et al, 2020). They have been interpreted using 1D (Romo-Jones et al, 2020), 2D (Arzate et al, 2018), and 3D inversion approaches (Corbo-Camargo et al, 2020;Benediktsdöttir et al, 2020;Romo-Jones et al, 2021). Focusing in the 3D results, it is not easy to carry out comparisons between the modeled resistivities because the analyzed profiles in these works are different.…”
Section: Discussionmentioning
confidence: 99%
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“…There are two MT field data, those acquired in the CeMie-GEO project (Arzate et al, 2018), and those measured in the GEMex project (Benediktsdöttir et al, 2020). They have been interpreted using 1D (Romo-Jones et al, 2020), 2D (Arzate et al, 2018), and 3D inversion approaches (Corbo-Camargo et al, 2020;Benediktsdöttir et al, 2020;Romo-Jones et al, 2021). Focusing in the 3D results, it is not easy to carry out comparisons between the modeled resistivities because the analyzed profiles in these works are different.…”
Section: Discussionmentioning
confidence: 99%
“…However, the models close to producing wells can be compared. In the vicinity of productive wells H-7 and H-8 the resistivities in the depth range of the reservoir are: 50 to 200, 15 to 170, and 15 to 120 ohm▪m given, respectively, by Corbo-Camargo et al, 2020, Benediktsdöttir et al, 2020, and Romo-Jones et al, 2021 Close to another productive well H-19, the resistivities are about 200, 15 to 50, and 5 to 200 ohm▪m, respectively, from the same articles in the same order. Although there are obvious differences between the MT results and also with our results (50 to 220 ohm▪m, Figure 13), the ranges of variation overlap in several cases.…”
Section: Discussionmentioning
confidence: 99%
“…Reverse and normal displacements along these faults have been interpreted as the expression of changing stress field in the subsurface, as also documented by well logs and geophysical data (Carrasco-Núñez et al, 2017;Corbo-Camargo et al, 2020;Lermo et al, 2008;Lermo Samaniego et al, 2016;Lorenzo-Pulido, 2008;Norini et al, 2019;Norini et al, 2015;Rocha et al, 2010). The most probable origin of the local stress field has been suggested to be the pressurization of the shallow magmatic and/or hydrothermal system of the caldera complex (Montanari et al, 2017;Norini et al, 2019;Norini et al, 2015).…”
Section: The Los Humeros Geothermal Fieldmentioning
confidence: 67%
“…The Los Humeros fault exhibits a prominent fault scarp with a maximum elevation of 70-80 m above the caldera floor, showing a westward dip and dominant dip-slip normal displacement of a hydrothermally altered pumice fall deposit and underlying lava flows with a minor component of left-lateral motion (Norini et al, 2019;Norini et al, 2015). Partly buried, eastward dipping, NNW-SSE reverse faults have also been identified 0.5-1 km to the west of the Los Humeros fault scarp by means of fieldwork, well logs, magnetotelluric sounding and seismic data (Corbo-Camargo et al, 2020;Lermo Samaniego et al, 2016;Norini et al, 2019) (Figure 6.1a-c). These data indicated that the Los Humeros and the main reverse fault planes merge at about 1 km depth (Bonini et al, 2021;Carrasco-Núñez et al, 2017;Corbo-Camargo et al, 2020;Norini et al, 2019) (Figure 6.1c), although the subsurface geometry of these structures is rather uncertain, due to the limitations of the geological and geophysical datasets.…”
Section: The Los Humeros Geothermal Fieldmentioning
confidence: 96%
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