Occam and Bostick 1-D inversion of magnetotelluric soundings in he Chicxulub Impact Crater, Yucatán, Mexico

Delgado‐Rodríguez, Omar; Campos-Enríquez, Oscar; Urrutia‐Fucugauchi, J.; Arzate, Jorge

doi:10.22201/igeof.00167169p.2001.40.4.410

Cited by 9 publications

(2 citation statements)

References 22 publications

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“…We based the new conductivity model on data from broadband magnetotelluric (MT) surveys distributed in central and southern Mexico (Corbo‐Camargo et al., 2013; Delgado‐Rodríguez et al., 2001; Jording et al., 2000; Sedlock et al., 1993) and the southern United States (Fernberg, 2012; Kelbert et al., 2019). As shown in Figure 2a we modeled the Mexican lithosphere and upper mantle conductivity through a mosaic of 15 stratified blocks, such as the EURHOM model (Ádám et al., 2012).…”

Section: Numerical Modeling Of Gic In the Mexican Power Gridmentioning

confidence: 99%

Improved Model for GIC Calculation in the Mexican Power Grid

Caraballo,

González‐Esparza,

Pacheco

et al. 2023

Space Weather

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We present the first observations of geomagnetically induced currents (GIC) in the Mexican power grid and an improved model to calculate them. The new model comprises ca. 250 substations working at various voltage levels, a methodology to estimate geomagnetic disturbances (δB) at different points throughout the Mexican territory, and a 1D piecewise model that considers lateral variations in the ground conductivity. This is an improvement of a former uniform conductivity model presented previously to calculate our first GIC estimates (Caraballo et al., 2020). We compared the observed and calculated GIC between August and November 2021 at a coastal 400 kV substation. During this interval, five geomagnetic storms occurred (G1 and G2). The observed GIC exceeded 10 A during the most strong event; this shows a clear grid response even under weak geomagnetic perturbations that occurred during the solar minimum. Further comparison with the results of the former model suggests that the new 1D piecewise model yields better GIC estimates for the Mexican power grid.

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Section: Numerical Modeling Of Gic In the Mexican Power Gridmentioning

confidence: 99%

Improved Model for GIC Calculation in the Mexican Power Grid

Caraballo,

González‐Esparza,

Pacheco

et al. 2023

Space Weather

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“…A 1D earth model was created using the Occam inversion code developed by Constable et al [62] and Bostick [63] to produce an appropriate solution for the sub-surface 1D structure. The MT sounding curve and the 1D inversion data can provide information regarding the general structure expected from the subsequent 2D and 3D modeling.…”

Section: One-dimensional Inversionmentioning

confidence: 99%

Mapping of Fault and Hydrothermal System beneath the Seulawah Volcano Inferred from a Magnetotellurics Structure

et al. 2021

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Magnetotellurics (MT) is an important geophysical method for exploring geothermal systems, with the Earth resistivity obtained from the MT method proving to be useful for the hydrothermal imaging changes of the system. In this research, we applied the MT method to map the geothermal system of the Seulawah Agam volcano in northern Sumatra, a site intended for the construction of a geothermal power plant with an estimated energy of 230 Mwe. Herein, 3D MT measurements were carried out, covering the entire area of the volcano and the various intersecting local faults from the Seulimeum segment in the NW–SE direction. Based on Occam 2D inversion, a conductive anomaly (<10 ohm·m) near the surface was identified in response to specific manifestation areas, including the Heutsz crater on the northern side and the Cempaga crater on the southern side. A further conductive anomaly was also found at a depth of 1 km, which was presumably due to a clay cap layer covering the fluid in the reservoir layer below the surface, where the manifestation areas are formed at various locations (where faults and fractures are found) owing to the fluid in the reservoir rising to the surface. The MT modeling also revealed that the reservoir layer in Seulawah Agam lies at a depth of 2 km with a higher resistivity of 40–150 ohm·m, which is the main target of geothermal energy exploration. At the same time, the heat source zone where magma is located was estimated to lie in two locations, namely, on the northern side centering on the Heutsz crater area and the southern side in the Cempaga crater area. A clear 3D structure obtained via Occam inversion was also used to visualize the hydrothermal flow in the Seulawah Agam volcano that originates from two heat source zones, where one structure that was consistent across all models is the conductive zone that reaches a depth of 5 km in the south in response to the regional faulting of the Seulimeum segment. Based on the MT research, we concluded that the volcano has the geothermal potential to be tapped into power plant energy in the future.

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Multiring-forming large bolide impacts and evolution of planetary surfaces

Urrutia‐Fucugauchi

Pérez‐Cruz

2009

International Geology Review

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In the past few years, meteoritic and cometary impacts have emerged as a major geological agent in the construction and evolution of planetary surfaces. Formation of complex central ring, peak ring and multiring craters involves excavation and melting of large volumes of crustal material. High-resolution geophysical mapping measuring gravity, magnetics, and topography of the Moon and Mars have recently provided information on the subsurface structure of large basins and aided in identifying buried giant craters. The terrestrial crater record has been significantly erased by tectonic, magmatic, and erosion processes and only a small proportion of impact structures remain. Record of multiring craters is limited to three examples: Vredefort, Sudbury and Chicxulub. Deep geophysical surveys and geochemical and isotopic studies of those craters provide means to evaluate the influence of large impacts on the lithospheric and crustal evolution by providing estimates of excavation depth and volume, amounts of material fragmented, ejected, vaporized and melted, and effects on the crustal stratigraphy and crustal thickness. Analyses on the melt from Vredefort, Sudbury, and Chicxulub indicate andesitic composition derived from lower-crustal material. The melt formed inside the lower transient cavity from lower crustal material that was then redistributed and emplaced in upper-crustal levels, resulting in crustal redistribution. Crystalline basement clasts fragmented and incorporated into the breccias show varying degrees of alteration but no significant thermal effects. Ejecta were deposited locally within the crater region and ballistic material and fine ejecta are globally distributed on the planetary surface. Impacts influence the crust-mantle boundary, with Moho uplift. Material from the mantle was not incorporated into the melt and impact breccias, indicating that the excavation cavities were confined to the lower crust. This is also apparently the case for the giant basins on the Moon, including the 2500 km diameter South Pole-Aitken Basin. Considering the numbers of large multiring basins, possible flux of large impacts, and effects on target surfaces, crustal scale redistribution of material during those large impacts has played a major role in the evolution of planetary surfaces.

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Occam and Bostick 1-D inversion of magnetotelluric soundings in he Chicxulub Impact Crater, Yucatán, Mexico

Cited by 9 publications

References 22 publications

Improved Model for GIC Calculation in the Mexican Power Grid

Improved Model for GIC Calculation in the Mexican Power Grid

Mapping of Fault and Hydrothermal System beneath the Seulawah Volcano Inferred from a Magnetotellurics Structure

Multiring-forming large bolide impacts and evolution of planetary surfaces

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