Gravity and magnetic survey of the Oaxaca city region: Cenozoic horst-and-graben structure superimposed on the Oaxaca–Juarez terrane boundary, southern Mexico

Campos-Enríquez, J. O.; Belmonte-Jiménez, Salvador Isidro; Keppie, J. Duncan; Ortega-Gutiérrez, Fernando; Arzate, Jorge; Martinez-Silva, J.; Martínez‐Serrano, Raymundo G.

doi:10.1016/j.jsames.2009.11.002

Cited by 11 publications

(5 citation statements)

References 27 publications

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“…Magnetic anomalies are caused by diversities between the magnetic properties of the target body and the surrounding lithosphere. This difference in magnetic properties can be applied in geophysical exploration such as edge detection 1,2 , mineral [3][4][5] , unexploded ordnance (UXO) [6][7][8] exploration, and geological investigation [9][10][11][12][13][14][15] . Magnetic anomaly surveying is a most effective tool for mineral exploration.…”

Section: Jianhua Yang Shuang Liu * and Xiangyun Humentioning

confidence: 99%

Inversion of high-amplitude magnetic total field anomaly: an application to the Mengku iron-ore deposit, northwest China

Yang

Liu

2020

Sci Rep

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relative-error (the difference/the magnitude magnetic anomaly) reach 10% with spherical model. They suggest projection anomaly is not credible especially as high-precision of quantitative processing and interpretation are required and propose a method using the error yielded by the projection anomaly. Coleman and Li 29 studied the difference between the errors of the total-field anomaly and magnetic amplitude data and found that the errors in the three orthogonal components converted from the total-field anomaly had similar standard deviations. Based on the total magnetic anomaly is no longer approximately equal to projection anomaly in the highly magnetic environments, Sun et al. 30 used the information from the borehole data and structural orientation as constraints and get an acceptable result. In our study, we define the error between projection anomaly and observed modulus difference anomaly firstly and carefully discuss the error caused by amplitude, inclination and declination individually and together between the projection anomaly results (data processing, inversion and interpretation) with those of the modulus difference anomaly for strong magnetic anomalies. Second, we propose directly inverting for the modulus difference anomaly in strong magnetic bodies under Cartesian coordinate. Third, the operator, given by modulus difference anomaly, is nonlinear which is different with projection anomaly. Finally, the synthetic and field data are used to test the inversion method with two types of total field data.

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Section: Jianhua Yang Shuang Liu * and Xiangyun Humentioning

confidence: 99%

Inversion of high-amplitude magnetic total field anomaly: an application to the Mengku iron-ore deposit, northwest China

Yang

Liu

2020

Sci Rep

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“…The Alto Atoyac sub-basin has a surface area of 3744.64 km 2 , with an approximate aquifer surface of 1130 km 2 , the annual R e ranges from 153.6 to 169 million m 3 [22], with an average annual P (P) of 741 mm/year and annual average temperature (T) of 19.96 • C. The region's bedrock includes metamorphic gneiss and schists, limestones, and rhyolites. The metamorphic rocks and extrusive volcanic rocks constitute the impermeable borders of the sub-basin [22] (for more detail of the geology see [23] and [24]. The 396 km long Atoyac River is the main river course through the Central Valleys.…”

Section: Study Areamentioning

confidence: 99%

“…The region's bedrock includes metamorphic gneiss and schists, limestones, and rhyolites. The metamorphic rocks and extrusive volcanic rocks constitute the impermeable borders of the sub-basin [22] (for more detail of the geology see [23] and [24]. The 396 km long Atoyac River is the main river course through the Central Valleys.…”

Section: Study Areamentioning

confidence: 99%

Climate Change, Land Use/Land Cover Change, and Population Growth as Drivers of Groundwater Depletion in the Central Valleys, Oaxaca, Mexico

et al. 2019

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Groundwater depletion is an important problem driven by population growth, land use and land cover (LULC) change, climate change, and other factors. Groundwater depletion generates water stress and encourages unstainable resource use. The aim of this study is to determine how population growth, LULC change, and climate change relate to groundwater depletion in the Alto Atoyac sub-basin, Oaxaca, Mexico. Twenty-five years of dry season water table data from 1984 to 2009 are analyzed to examine annual groundwater depletion. Kriging is used to interpolate the region’s groundwater levels in a geographic information system (GIS) from mapped point measurements. An analysis of remotely sensed data revealed patterns of LULC change during a 34-year (1986–2018) period, using a supervised, machine-learning classification algorithm to calculate the changes in LULC. This analysis is shown to have an 85% accuracy. A global circulation model (GFDL-CM3) and the RCP4.5 and RCP8.5 scenarios were used to estimate the effects of climate change on the region’s groundwater. Estimates of evapotranspiration (using HELP3.5 code) and runoff (USDA-SCS-CN), were calculated. Since 1984, the region’s mean annual temperature has increased 1.79 °C and urban areas have increased at a rate of 2.3 km2/year. Population growth has increased water consumption by 97.93 × 106 m3/year. The volume of groundwater is shrinking at a rate of 284.34 × 106 m3/year, reflecting the extreme pressure on groundwater supply in the region. This research reveals the nature of the direct impacts that climate change, changing LULCs, and population growth have in the process of groundwater depletion.

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“…The area surrounding the leachate lagoon is composed by granular alluvial material and fractured sedimentary rocks such as sandstone the subsoil (Belmonte et al, 2005). Another important feature to consider is the presence of (Nieto-Samaniego et al, 1995;; Campos-Enríquez et al, 2010).…”

Section: Study Sitementioning

confidence: 99%

Characterization of a leachate contaminated site integrating geophysical and hydrogeological information

Belmonte-Jiménez

Jiménez-Castañeda

Pérez-Flores

et al. 2012

GeofInt

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Se reporta en este estudio la caracterización de una zona contaminada por lixiviados, siguiendo una metodología que integra datos geofísicos y geohidrológicos para proponer un modelo hidrogeológico del fenómeno. La caracterización del sitio (la estructura del subsuelo, y las características del suelo) incluyó seis perfiles sísmicos de refracción, tres líneas electromagnéticas (FDEM), dos perfiles eléctricos (ERT), cinco sondeos eléctricos verticales (SEV), y una serie de pruebas geohidrológicas para delimitar la pluma contaminante. El área de estudio corresponde a la laguna de lixiviados del relleno sanitario de la ciudad de Oaxaca, sur de México. El modelo hidrogeológico que se presenta constituye un ejemplo del potencial de la integración de varios métodos aplicados con el mismo objetivo; reduciendo así la ambigüedad de la respuesta geofísica. Los resultados indican que los valores de baja resistividad (1.5 a 2.5 Ohm-m) se relacionan con un suelo contaminado subyaciendo a la laguna de lixiviados y al medio fracturado. También se detectó un desplazamiento de la pluma contaminante hacia el SW de la laguna. La calidad del agua es buena, pero la actividad humana en el área de estudio confiere un riesgo para el acuífero superficial de Zaachila.

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Gravity and magnetic survey of the Oaxaca city region: Cenozoic horst-and-graben structure superimposed on the Oaxaca–Juarez terrane boundary, southern Mexico

Cited by 11 publications

References 27 publications

Inversion of high-amplitude magnetic total field anomaly: an application to the Mengku iron-ore deposit, northwest China

Inversion of high-amplitude magnetic total field anomaly: an application to the Mengku iron-ore deposit, northwest China

Climate Change, Land Use/Land Cover Change, and Population Growth as Drivers of Groundwater Depletion in the Central Valleys, Oaxaca, Mexico

Characterization of a leachate contaminated site integrating geophysical and hydrogeological information

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