Geofisica Internacional最新文献

{"title":"Apunte geológico de la zona geotérmica de Pathé, Hidalgo ? nuevos datos y revisión histórica a partir de fuentes documentales","authors":"C. Miquel, S. I. Franco, L. Rodríguez, Abdorahman Rajabi, Fernando Núñez Useche","doi":"10.22201/IGEOF.00167169P.2021.60.3.2130","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.3.2130","url":null,"abstract":"La zona geotérmica de Pathé, en el sector oriental de la Faja Volcánica Transmexicana, ha atraído la atención de exploradores y científicos desde finales del siglo XVIII. El ingeniero de minas alemán Joseph Burkart (1798-1870), discípulo de Alexander von Humboldt (1769-1859), elaboró en 1836 una detallada descripción geológica de la zona, gracias a la cual esta zona geotérmica fue la primera en México en investigarse bajo los paradigmas de la ciencia moderna. A inicios del siglo XX la zona fue estudiada por el ingeniero José Guadalupe Aguilera Serrano (1857-1941), quien en 1907 describió las rocas eruptivas y sus productos de alteración. Su interés eran los yacimientos de caolín de Yexthó, situados a un km de las manifestaciones de termales. A mediados de siglo la zona ya se prospectaba como fuente de energía geotérmica, lo que culminó en la primera planta geotermoeléctrica del continente americano, en operación entre 1959 y 1972 con una capacidad nominal de 3.5 MW. \u0000Las manifestaciones termales de Pathé se ubican en la intersección de dos sistemas regionales de fallas, de dirección N-S y E-W, y están encajonadas en una unidad volcánica (toba y lava) de composición básica a intermedia y edad Mioceno superior. Las alteraciones hidrotermales superficiales son conspicuas y su distribución está igualmente controlada por fallas pertenecientes a ambos sistemas. Asociada a las fallas N-S ocurre la asociación de alteración calcita-yeso, que involucra fluidos oxidados y alcalinos. Por otro lado, ligados a las fallas E-W ?más tardías? se hallan los depósitos de caolín, producto de una alteración argílica avanzada, característica de zonas de condensación de vapor. Las condiciones del fluido indicadas por esta alteración son un pH muy ácido (2–3) y temperaturas cercanas a los 100 °C. Por su clara asociación con las fallas, así como por la ausencia de vulcanismo reciente (Cuaternario) cercano, Pathé se clasifica como un sistema geotérmico convectivo controlado por fallas. La sucesión de eventos de alteración sugiere que la actividad hidrotermal inició desde antes del Plioceno.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42261252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New Semi Quantitative Approach for Interpreting Vertical Electrical Sounding (VES) Measurements by Using Fractal Modeling Technique, Case Study from Khanasser Valley, Northern Syria","authors":"J. Asfahani","doi":"10.22201/IGEOF.00167169P.2021.60.3.1920","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.3.1920","url":null,"abstract":"Fractal modeling technique, with adapting the concentration-number (C-N) model and the threshold break points concept is newly proposed to interpret vertical electrical sounding (VES) measurements distributed along a given profile. New semi quantitative approach is consequently proposed to rapidly differentiate between different apparent resistivity populations, where 2D semi quantitative interpretation and a primary geological analysis could be constructed. The new technique is practiced and tested on a case study taken from Khanasser Valley, Northern Syria, where different selected profiles (LP1, LP2, LP3, and TP5) are interpreted. The availability and the feasibility of the proposed approached are confirmed and approved through the different comparisons between the multi fractal established cross sections and the traditional 1D VES interpretation models. It is recommended to routinely use this new proposed fractal approach in the geoelectrical researches for interpreting VES measurements distributed along a given profile.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44365154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How to use solutions of Advection-Dispersion Equation to describe reactive solute transport through porous media","authors":"Jetzabeth Ramirez Sabag, Dennys Armando López Falcón","doi":"10.22201/IGEOF.00167169P.2021.60.3.2024","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.3.2024","url":null,"abstract":"ResumenLas soluciones de la Ecuación de Advección-Dispersión son usadas frecuentemente para describir el transporte de solutos a través de medios porosos, considerando adsorción en equilibrio, de tipo lineal y reversible. Para indicar algunas sugerencias acerca de este tema, se hizo una revisión de las soluciones analíticas disponibles. Hay soluciones para Problemas con Condiciones de Frontera, de primer y tercer-tipo en la entrada así como de primer y segundo-tipo a la salida. Se analiza el comportamiento de las soluciones equivalentes, para sistemas finitos y semi-infinitos, observando que las soluciones de los sistemas semi-infinitos se aproximan a las correspondientes de los sistemas finitos conforme la condición de frontera de salida en el infinito se aproxima a la ubicación de medición del sistema finito. Solamente se presentan las soluciones analíticas con condiciones de frontera de segundo-tipo a la salida, ya que son iguales a las correspondientes soluciones analíticas con frontera de primer-tipo a la salida, para ambos tipos de condiciones de frontera de entrada usadas. Un análisis paramétrico, basado en el número de Peclet, muestra que todas las soluciones convergen cuando el número de Peclet es mayor que veinte. Los sistemas investigados deben tener un número de Peclet mayor que cinco para usar con confianza las soluciones de la Ecuación de Advección-Dispersión para describir el transporte de soluto en medios porosos.Palabras Clave: Ecuación de Advección-Difusión, Soluciones Analíticas, Transporte de Solutos Reactivos, Medios Porosos.AbstractThe solutions of Advection-Dispersion Equation are frequently used to describe solute transport through porous media when considering lineal and reversible equilibrium adsorption. To notice some warnings about this item, a review of analytical solutions available was done. There are solutions for Boundary Value Problems with first and third-type inlet boundary conditions as well as first and second-type outlet boundary condition. The behavior of equivalent solutions for finite and semi-infinite systems are analyzed, observing that semi-infinite system solutions approximates to the corresponding finite ones as the “infinite” outlet boundary condition approach to the finite measurement location. Because the analytical solutions with a first-type outlet boundary condition are equal to the corresponding analytical solutions with a second-type one, for both inlet boundary condition type used, only the latter is presented. A parametric analysis based on Peclet number shows that all solutions converge for Peclet number greater than twenty. Systems under research must have Peclet number greater than five to use confidently the solutions of Advection-Dispersion Equation to describe reactive solute transport through porous media.Keywords: Advection-Diffusion Equation, Analytical solutions, Reactive Solute Transport, Porous Media.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45461408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detection of total water mass changes in the Patagonian glaciers area by satellite gravimetry","authors":"A. Pereira, Cecilia Cornero, A. Matos, M. C. Pacino, D. Blitzkow","doi":"10.22201/IGEOF.00167169P.2021.60.2.2086","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.2.2086","url":null,"abstract":"Despite present efforts to better understand glacier changes and their trends, the satellite gravimetry is a powerful tool still not applied in depth to study relatively large areas in the Andes of Argentina and Chile. \u0000In this work the mass variations of the Patagonian Icefield are analyzed together with the decrease trends of the ice layer in the region. The purpose of this study is to demonstrate the GRACE satellite mission (Gravity Recovery and Climate Experiment) ability to detect the water storage changes over the glaciers area. Furthermore, the variations of the hydrometric level of some Patagonian lakes were monitored by combining satellite altimetry data and in situ measurements with the observed water mass variations. \u0000Data from GRACE was used to estimate gravity trends, and high-resolution CSR GRACE RL05 mascon solutions were used to analyze the water storage change of the icefields in the region under study for the 2002-2017 period. \u0000Virtual stations from satellite altimetry obtained from a lake database and also hydrometric height data from in situ stations, located at Patagonian lakes in Argentina and Chile, were also used in order to compare the TWS from GRACE to the water level of the specific lakes. Additionally, correlation coefficients were determined at each station.  \u0000The results show a significant water storage decrease in the Icefield area, and they also demonstrate that the ice melt in southern Patagonia (of about 6 cm/year) tends to be more pronounced than in the northern region.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45913564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-dimensional shear-wave quality factor, Qs(f), model for south-central Gulf of California, Mexico obtained from inversion of broadband data","authors":"Sanjay Kumar, A. Joshi, R. Castro, S. K. Singh, Sandeep Singh","doi":"10.22201/IGEOF.00167169P.2021.60.2.2053","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.2.2053","url":null,"abstract":"Abstract          We apply an iterative inversion scheme, initially developed by Hashida and Shimazaki (1984) and later modified by Joshi et al., (2010), to estimate three - dimensional shear - wave quality factor, Qs(f), of south-central Gulf of California, Mexico. An area of 230 km x 288 km in this region is divided into 108 rectangular blocks of different Qs(f). We use 25 well-located earthquakes recorded at three broadband stations of the regional network RESBAN operated by CICESE (Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California) and three Ocean Bottom Seismographs (OBS) of the Sea of Cortez Ocean Bottom Array (SCOOBA) experiment.  This dataset permits us to obtain Qs(f) estimates of different blocks using the modified inversion algorithm. Qs(f) is obtained at various frequencies in 0.16 - 7.94 Hz range. We found that the estimated Qs structure correlates with geological and tectonic models of the region proposed in previous studies. A regional frequency-dependent relation using all 1944 values of shear-wave quality factor is obtained at 18 different frequencies in all blocks can be approximated by a function of the form Qs(f) = 20 f 1.2. This relation is typical in a tectonically active region with high S-wave attenuation and is similar to attenuation relations reported by other authors for the Imperial Valley, California region.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42498308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multisource data integration for groundwater prospecting in Precambrian shear zones, Espírito Santo State (Southeastern Brazil)","authors":"M. E. Hartwig, C. Moreira, M. Melo","doi":"10.22201/IGEOF.00167169P.2021.60.2.2049","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.2.2049","url":null,"abstract":"The Precambrian metamorphic rocks in the southern region of the Espírito Santo State(southeastern Brazil) is intercepted by ductile and brittle/ductile shear zones over which towns like Guaçuí, Marechal Floriano and Domingos Martins were established. In the years of 2014 to 2016 the Espírito Santo State faced the worst drought in the past 80 years. In situations like that, the only source of fresh water available is underground. Therefore, the purpose of this study was to integrate multisource data for groundwater prospecting and management. The study area comprises the central sectors of the Guaçuí and Batatal shear zones. Methodology involved the interpretation of stereo-pairs for the identification of lineaments, electrical resistivity surveys and geological fieldwork. The results were tentatively validated with available groundwater well production data. Six resistivity profiles with a total length of 2,400 m were surveyed and 15 outcrops were described across these structures. Results have shown that the structural framework of the shear zones is predominantly made of NW to NNW and NE to NNE-trending lineaments. The former is related to brittle tectonics and the latter coincides with the ductile Precambrian fabric of the crystalline basement rocks. A near-surface porous aquifer regarded to the regolith and recent unconsolidated sedimentary deposits presenting resistivity values < 1,372 Ohm.m and depths < 30 m have good potential for groundwater storage. However, results arenot conclusive about the hydrogeological significance of tectonic structures for groundwaterprospection in the study area.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44528682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geophysical-Structural Framework in a Mineralized Region of Northwesternmost Camaquã Basin, Southern Brazil","authors":"H. Pereira","doi":"10.22201/IGEOF.00167169P.2021.60.2.2085","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.2.2085","url":null,"abstract":"Airborne and ground magnetic and gravimetric maps provide important information about the spatial distribution of causative sources in the geological substrate. These sources normally have different physical and geometric properties and are located at different depths, making it difficult to identify the geological features that correspond to the sources. Filtering and enhancement techniques can be used to highlight features in potential field anomalies (such as center and edges of sources). Also, these techniques remove associated noise, isolate shallow from deep sources, and estimate depths. We applied enhancement and depth estimation techniques in airborne and ground potential field data to delineate a subsurface structural framework of two copper occurrences (Victor Teixeira and Capão Grande) in the northwestern border of Camaquã Basin with the Sul-Riograndense Shield. Our results confirmed previously recognized structures and revealed an interconnected structural framework, which has an estimated depth of 170 m by Euler solutions. This configuration suggests a possible connection between the two mineralization outcrops, which are separated by a distance of 2,300 m.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"78 1","pages":"101-123"},"PeriodicalIF":0.4,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88527312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"La magnetometría como alternativa en la búsqueda de aguas subterráneas. El caso de la cuenca baja del río Grijalva.","authors":"Rubén de Jesús Escudero Durán, Marco Rogelio Bustamante Orozco, Edgar Ángeles Cordero, Iris Neri Flores, Ojilve Ramón Medrano Pérez","doi":"10.22201/IGEOF.00167169P.2021.60.2.2002","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.2.2002","url":null,"abstract":"La magnetometría mediante el campo magnético terrestre y las propiedades magnéticas de los materiales, entre otras cosas, tiene la capacidad para determinar regiones con potencial acuífero por medio de la identificación de estructuras geológicas que podrían ser asociadas con permeabilidad. El objetivo principal de esta investigación es identificar las áreas de unidades de rocas con posible potencial acuífero en las subcuencas de la porción oeste de la cuenca baja del río Grijalva, mediante la interpretación de las respuestas magnéticas obtenidas aplicando diversos algoritmos de detección de bordes y la elaboración de modelos 3D de la zona estudiada a base de voxels. Para ello, se realizó el procesado de datos aeromagnéticos con el propósito de resaltar e identificar las características geológicas sobresalientes. Los resultados muestran las zonas con mayor potencial acuífero en el área estudiada. Así, se busca contribuir al conocimiento local y propiciar la toma de decisiones en los temas geohidrológicos, ordenamiento territorial y políticas públicas relacionadas.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"4 1","pages":"175-192"},"PeriodicalIF":0.4,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75180818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Empirical Relationship for Assessing the Near-Field Horizontal Coseismic Displacement Using GPS Seismology Data","authors":"R. Darawcheh, R. A. Ghazzi, M. Abdul-Wahed","doi":"10.22201/IGEOF.00167169P.2021.60.1.2025","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.1.2025","url":null,"abstract":"In this research, a data set of horizontal GPS coseismic displacement in the near-field has been assembled around the world in order to investigate a potential relationship between the displacement and the earthquake parameters. Regression analyses have been applied to the data of 120 interplate earthquakes having the magnitude (Mw 4.8-9.2). An empirical relationship for prediction near-field horizontal GPS coseismic displacement as a function of moment magnitude and the distance between hypocenter and near field GPS station has been established using the multi regression analysis. The obtained relationship allows assessing the coseismic displacements associated with some large historical earthquakes occurred along the Dead Sea fault system. Such a fair relationship could be useful for assessing the coseismic displacement at any point around the active faults.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"37 1","pages":"31-50"},"PeriodicalIF":0.4,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87147922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of gravity on torsional surface waves in a dissipative medium","authors":"A. K. Gupta, P. Patra","doi":"10.22201/IGEOF.00167169P.2021.60.1.1916","DOIUrl":"https://doi.org/10.22201/IGEOF.00167169P.2021.60.1.1916","url":null,"abstract":"The present paper deals with the possibilities of propagation of torsional surface waves in a viscoelastic medium under gravity field. During the study it will observe that the increase in gravity parameter will increase the velocity of the wave, the increase in viscoelastic parameter, decrease the velocity of the wave until the product of angular frequency and viscoelastic parameter is less than unity. It also notes that as the velocity increases, the curve becomes asymptotic in nature when the period of oscillation increases. In fact the maximum damping in velocity has been identified at this cut off point which may be considered as the point where a viscoelastic material becomes a viscous medium.The absorption coefficients have also been calculated for different values of the viscoelastic parameter and gravity field.","PeriodicalId":12624,"journal":{"name":"Geofisica Internacional","volume":"311 1","pages":"1-13"},"PeriodicalIF":0.4,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91364075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}