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10 results on '"tierra blanca"'

1. Problemática y conocimiento actual de Las tefras tierra blanca joven en el área Metropolitana de San Salvador, El Salvador Problematic and current knowledge of the tierra blanca joven tephras in the metropolitan area of San Salvador, El Salvador

Author

José A. Chávez, Walter Hernández, and Lubomir Kopecky

Subjects
Tierra Blanca geotecnia, parcialmente saturado, succión, colapsable, erosión, movimiento de ladera, Tierra Blanca, geotechnical, unsaturated, suction, collapsible, erosion, mass movement, Geology, QE1-996.5
Abstract

En la actualidad el Área Metropolitana de San Salvador experimenta problemas graves de movimientos de ladera, erosión, colapso o asentamientos del terreno; fenómenos que son englobados popularmente en El Salvador por el término “cárcavas”. Esta problemática se presenta principalmente en las tefras volcánicas llamadas Tierra Blanca Joven (TBJ) producto de la última erupción pliniana de la Caldera de Ilopango, cuyos productos son una intercalación de estratos de piroclastos de caída, flujos y oleadas piroclásticos. Las tefras son parcialmente saturadas y la información geotécnica muestra la disminución de resistencia al corte y colapso al ser saturadas. Para caracterizar adecuadamente este material es necesario conocer la relación del contenido de humedad con los cambios de volumen y la cohesión aparente, que puede estar relacionada a la succión y a cementación. El entendimiento del comportamiento de los materiales geológicos puede ayudar en la simulación de estabilidad de taludes y diseño geotécnico en general.Currently the Metropolitan Area of San Salvador (AMSS) is experimenting serious problems of mass movements, erosion, collapse or settlements, phenomena that in El Salvador are popularly encompassed by the term “carcavas”. This problematic is presented mainly in the volcanic tephras Tierra Blanca Joven (TBJ), product of the last plinian eruption of Ilopango Caldera, whose products are an intercalation of pyroclastic fall, flows and surge. The tephras are unsaturated and the geotechnical information shows a decrease of shear strength and collapse when saturated. To characterize properly this material is important to know the relationship of moisture content with the volume changes and apparent cohesion, which are related to suction and cementation. The understanding of the behavior of the geological materials can help in running slope stability simulations and geotechnical design in general.

Published
2012

2. Mapeo de ingeniería geológica en parte sur del área metropolitana de San Salvador Engineering geology mapping in the southern part of the metropolitan area of San Salvador

Author

José A Chávez, Jan Valenta, Jan Schröfel, Walter Hernandez, and Jiří Šebesta

Subjects
Ingeniería geológica, método de bandas, geología, formación San Salvador, formación bálsamo, Tierra Blanca, Engineering geology, stripe method, geology, San Salvador Formation, Balsamo Formation, Geology, QE1-996.5
Abstract

El uso de mapas geológicos clásicos que agrupan los estratos por edad u origen, dificulta la interpretación y uso para diseños de ingeniería civil o planificación urbana, para las personas sin conocimientos profundos en geología. Debido a esto se ha llevado a cabo mapeo de ingeniería geológica en sector sur del Área Metropolitana de San Salvador, haciendo uso de la metodología de bandas. El objetivo de la metodología es que la información geológica, peligrosidad geológica y recomendaciones geotécnicas puedan representarse y agruparse dependiendo de las características intrínsecas de cada zona. Esta información puede ser fácilmente interpretada por los planificadores urbanos, constructores privados y agencias gubernamentales. La debilidad en la recopilación e investigación de información geológica y geotécnica en El Salvador, son unas de las razones de la problemática que experimenta la región, indicando la importancia de mejorar el manejo del riesgo, así como la mecánica de suelos y de rocasThe use of classic geologic maps, where geological layers are grouped according to their age or origin, makes difficult the interpretation and use for civil engineer design or urban planning to people without deep knowledge in geology. Due to this reason engineering geological mapping has been carried out in the southern part of the Metro- politan Area of San Salvador using the stripe method. The objective of the methodology is that geological information, geological hazards and geotechnical recommendations as well, can be represented and grouped depending on the intrinsic characteristics of each zone. This information can be easily interpreted for urban planners, private builders and government agencies. The weakness in the compilation and research of geological and geotechnical information in El Salvador, are some of the reasons for the current problems that experiment the region, indicating the importance of improving risk management, as well as soil and rocks mechanics

Published
2012

3. PROBLEMÁTICA Y CONOCIMIENTO ACTUAL DE LAS TEFRAS TIERRA BLANCA JOVEN EN EL ÁREA METROPOLITANA DE SAN SALVADOR, EL SALVADOR.

Author

Chávez, José A., Hernández, Walter, and Kopecky, Lubomir

Subjects
*VOLCANIC ash, tuff, etc., *EROSION, *MASS-wasting (Geology), *COLLAPSIBLE soil, *ECOLOGY
Abstract

Currently the Metropolitan Area of San Salvador (AMSS) is experimenting serious problems of mass movements, erosion, collapse or settlements, phenomena that in El Salvador are popularly encompassed by the term "carcavas". This problematic is presented mainly in the volcanic tephras Tierra Blanca Joven (TBJ), product of the last plinian eruption of Ilopango Caldera, whose products are an intercalation of pyroclastic fall, flows and surge. The tephras are unsaturated and the geotechnical information shows a decrease of shear strength and collapse when saturated. To characterize properly this material is important to know the relationship of moisture content with the volume changes and apparent cohesion, which are related to suction and cementation. The understanding of the behavior of the geological materials can help in running slope stability simulations and geotechnical design in general. [ABSTRACT FROM AUTHOR]

Published
2012

4. ENGINEERING GEOLOGY MAPPING IN THE SOUTHERN PART OF THE METROPOLITAN AREA OF SAN SALVADOR.

Author

Chávez, José A., Valenta, Jan, Schröfel, Jan, Hernandez, Walter, and Šebesta, Jiří

Subjects
*GEOLOGICAL mapping, *CIVIL engineering, *GEOTECHNICAL engineering, *URBAN planning & the environment, *URBAN planning, *SOIL mechanics, *EQUIPMENT & supplies
Abstract

The use of classic geologic maps, where geological layers are grouped according to their age or origin, makes difficult the interpretation and use for civil engineer design or urban planning to people without deep knowledge in geology. Due to this reason engineering geological mapping has been carried out in the southern part of the Metropolitan Area of San Salvador using the stripe method. The objective of the methodology is that geological information, geological hazards and geotechnical recommendations as well, can be represented and grouped depending on the intrinsic characteristics of each zone. This information can be easily interpreted for urban planners, private builders and government agencies. The weakness in the compilation and research of geological and geotechnical information in El Salvador, are some of the reasons for the current problems that experiment the region, indicating the importance of improving risk management, as well as soil and rocks mechanics. [ABSTRACT FROM AUTHOR]

Published
2012

5. The Development of Automated Information Systems to reduce the Digital Divide in Agricultural Communities: The Case of the Agricultural Information Service in Tierra Blanca (SIT), Costa Rica

Author

Thomas, Laura Solera, Alvarado, Daniela Muñoz, Araya, Carlos Angulo, Ramírez, José Joaquín Brenes, Ramírez, José Manuel Brenes, Víquez, Gabriel Brenes, Acuña, Sonia Gómez, and Redondo, Fausto Víquez

Subjects
Digital divide agricultural library, information systems, information access, digital literacy, Tierra Blanca, Costa Rica
Abstract

This study aims to analyze the phenomena of the digital divide in the community of Tierra Blanca and presents the case of the Agricultural Information Service in Tierra Blanca as a solution to reduce the digital divide in this farming community. Based on the promise that Information and Communication Technologies (ICT) have a great importance in today´s society, the article analyzes the concept of digital divide composed by three components: access to information, connectivity and digital literacy, contextualized in farming communities. The paper studies the relationship between the digital divide and the productive, political, economic, social, cultural and commercial business development of small farmers. Based on the collaboration of a group of farmers in Tierra Blanca, the impact of the digital divide is considered specifically in this community. The case of the Agricultural Information Service in Tierra Blanca is presented as an automated information system that allows to combat lags generated by this phenomena. The study concludes that the case of the Agricultural Information Service in Tierra Blanca is an initiative that has reduced the digital divide in a comprehensive way for farmers, but the development of comprehensive policies and strategies at the community and national levels is necessary, seeking the involvement of various institutions and communities., International Journal on Food System Dynamics, Vol 5, No 4 (2014): Special issue: Challenge of IT, Innovation and Knowledge

Published
2015
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6. Mapeo de ingeniería geológica en parte sur del Área Metropolitana de San Salvador

Author

Jan Valenta, Jan Schröfel, Jiří Šebesta, Walter Hernández, and José A. Chávez

Subjects
Engineering geology, geology, Tierra Blanca, formación bálsamo, formación San Salvador, Balsamo Formation, General Medicine, San Salvador Formation, método de bandas, stripe method, Ingeniería geológica, geología
Abstract

The use of classic geologic maps, where geological layers are grouped according to their age or origin, makes difficult the interpretation and use for civil engineer design or urban planning to people without deep knowledge in geology. Due to this reason engineering geological mapping has been carried out in the southern part of the Metro- politan Area of San Salvador using the stripe method. The objective of the methodology is that geological information, geological hazards and geotechnical recommendations as well, can be represented and grouped depending on the intrinsic characteristics of each zone. This information can be easily interpreted for urban planners, private builders and government agencies. The weakness in the compilation and research of geological and geotechnical information in El Salvador, are some of the reasons for the current problems that experiment the region, indicating the importance of improving risk management, as well as soil and rocks mechanics El uso de mapas geológicos clásicos que agrupan los estratos por edad u origen, dificulta la interpretación y uso para diseños de ingeniería civil o planificación urbana, para las personas sin conocimientos profundos en geología. Debido a esto se ha llevado a cabo mapeo de ingeniería geológica en sector sur del Área Metropolitana de San Salvador, haciendo uso de la metodología de bandas. El objetivo de la metodología es que la información geológica, peligrosidad geológica y recomendaciones geotécnicas puedan representarse y agruparse dependiendo de las características intrínsecas de cada zona. Esta información puede ser fácilmente interpretada por los planificadores urbanos, constructores privados y agencias gubernamentales. La debilidad en la recopilación e investigación de información geológica y geotécnica en El Salvador, son unas de las razones de la problemática que experimenta la región, indicando la importancia de mejorar el manejo del riesgo, así como la mecánica de suelos y de rocas

Published
2012

7. Mapeo de ingeniería geológica en parte sur del Área Metropolitana de San Salvador

Author

Chávez, José A., Valenta, Jan, Schröfel, Jan, Hernandez, Walter, and Šebesta, Jiří

Subjects
formación san salvador, geology, formación bálsamo, ingeniería geológica, tierra blanca, engineering geology, san salvador formation, balsamo formation, método de bandas, geología, stripe method
Abstract

The use of classic geologic maps, where geological layers are grouped according to their age or origin, makes difficult the interpretation and use for civil engineer design or urban planning to people without deep knowledge in geology. Due to this reason engineering geological mapping has been carried out in the southern part of the Metropolitan Area of San Salvador using the stripe method. The objective of the methodology is that geological information, geological hazards and geotechnical recommendations as well, can be represented and grouped depending on the intrinsic characteristics of each zone. This information can be easily interpreted for urban planners, private builders and government agencies. The weakness in the compilation and research of geological and geotechnical information in El Salvador, are some of the reasons for the current problems that experiment the region, indicating the importance of improving risk management, as well as soil and rocks mechanics. El uso de mapas geológicos clásicos que agrupan los estratos por edad u origen, dificulta la interpretación y uso para diseños de ingeniería civil o planificación urbana, para las personas sin conocimientos profundos en geología. Debido a esto se ha llevado a cabo mapeo de ingeniería geológica en sector sur del Área Metropolitana de San Salvador, haciendo uso de la metodología de bandas. El objetivo de la metodología es que la información geológica, peligrosidad geológica y recomendaciones geotécnicas puedan representarse y agruparse dependiendo de las características intrínsecas de cada zona. Esta información puede ser fácilmente interpretada por los planificadores urbanos, constructores privados y agencias gubernamentales. La debilidad en la recopilación e investigación de información geológica y geotécnica en El Salvador, son unas de las razones de la problemática que experimenta la región, indicando la importancia de mejorar el manejo del riesgo, así como la mecánica de suelos y de rocas.

Published
2012

8. Problemática y conocimiento actual de las tefras tierra blanca joven en el Área Metropolitana de San Salvador, el Salvador

Author

Chávez, José A., Hernández, Walter, and Kopecky, Lubomir

Subjects
geotechnical, parcialmente saturado, suction, mass movement, movimiento de ladera, erosión, unsaturated, erosion, tierra blanca, colapsable, tierra blanca geotecnia, succión, collapsible
Abstract

Currently the Metropolitan Area of San Salvador (AMSS) is experimenting serious problems of massmovements, erosion, collapse or settlements, phenomena that in El Salvador are popularly encompassed by the term“carcavas”. This problematic is presented mainly in the volcanic tephras Tierra Blanca Joven (TBJ), product of thelast plinian eruption of Ilopango Caldera, whose products are an intercalation of pyroclastic fall, flows and surge. Thetephras are unsaturated and the geotechnical information shows a decrease of shear strength and collapse when satu-rated. To characterize properly this material is important to know the relationship of moisture content with the volumechanges and apparent cohesion, which are related to suction and cementation. The understanding of the behavior of thegeological materials can help in running slope stability simulations and geotechnical design in general. En la actualidad el Área Metropolitana de San Salvador experimenta problemas graves de movimientosde ladera, erosión, colapso o asentamientos del terreno; fenómenos que son englobados popularmente en El Salvadorpor el término “cárcavas”. Esta problemática se presenta principalmente en las tefras volcánicas llamadas Tierra BlancaJoven (TBJ) producto de la última erupción pliniana de la Caldera de Ilopango, cuyos productos son una intercalación de estratos de piroclastos de caída, flujos y oleadas piroclásticos. Las tefras son parcialmente saturadas y la informacióngeotécnica muestra la disminución de resistencia al corte y colapso al ser saturadas. Para caracterizar adecuadamenteeste material es necesario conocer la relación del contenido de humedad con los cambios de volumen y la cohesión apa-rente, que puede estar relacionada a la succión y a cementación. El entendimiento del comportamiento de los materialesgeológicos puede ayudar en la simulación de estabilidad de taludes y diseño geotécnico en general.

Published
2011

9. Analysis of the effects of carbonate mounds on associated stratal geometry and fracture development, Sacramento Mountains, New Mexico, USA

Author

Tinker, Nathan Scott

Subjects
Carbonate mound, Fracture, Differential compaction, Mechanical stratigraphy, Fault, Fold, UAV, Drone, Sacramento Mountains, New Mexico, Lake Valley, Mississippian, Pennsylvanian, Carboniferous, Deformation, Tierra Blanca, Alamogordo, Diagenesis, Cementation
Abstract

The objective of this research is an integrated structural‐stratigraphic analysis of compaction‐related fracturing in carbonate mounds and associated cover strata. The influence of early-cemented carbonate mounds on subsequent sediment deposition (such as creation of hard substrates and topographic relief) is relatively well-understood. The effect of early-cemented carbonate mounds during burial, however, has not been studied in detail. Early marine cementation of mounds enhances mechanical rigidity, which reduces mound compaction during burial as compared to less-resistant sediments surrounding and overlying the mound. This rigidity difference facilitates differential compaction of sediments overlying the mound, which are warped over the inflection point created by the mound topography. This study hypothesizes that there is a measurable increase in fracture intensity associated with differential compaction above early-lithified carbonate mounds. Thus, this work analyzes and quantifies the effects of differential compaction on stratal geometry, mechanical stratigraphy, and fracture development in Mississippian strata overlying carbonate mounds which are well-exposed in the Sacramento Mountains in southeast New Mexico. Methods employed in this study are drawn from structural geology, sedimentology, petrography, and remote sensing in an effort to adequately determine facies, examine fracture characteristics (e.g. size, orientation, and intensity), and to better understand which process(es) most directly control those characteristics (e.g. host rock facies type, diagenesis, bed thickness, mound proximity, mound size). Innovative methods of outcrop characterization such as high-resolution gigapan photography and unmanned aerial vehicle (UAV) photography were combined with photogrammetric techniques to create photo-realistic 3D outcrop models. The resulting models enabled a cost-effective, more detailed, less-distorted, and more comprehensive interpretation compared to previous methods, and improved understanding of the relationship between stratigraphy, rock mechanical evolution, and structural deformation in carbonate mound systems. Field work documented facies, stratal geometries, folds, faults, and fracture sets which validated observations and characterizations made using high-resolution field photographs and 3D outcrop models. Results of this work show that paleotopographic relief which has been early lithified (in this instance, Mississippian carbonate mounds) directly controls fracture development and overlying stratal geometry, in that there is a significant increase in tension fracture (mode 1) intensity above pre-existing rigid structures and over-steepening of bed dips beyond an expected and reasonable angle of repose. Additionally, this work outlines a multi-stage tectonostratigraphic sequence of the development of the stratigraphically complex Teepee Mound assemblage based on field observations of facies, fractures, stratal geometries, and diagenetic effects (e.g. cementation, compaction, and chertification), which includes new evidence of late-Mississippian tectonic compression. This result emphasizes the importance of understanding both syndepositional and post-depositional processes in outcrop characterization. Specifically, syndepositional processes establish the original mechanical stratigraphy and control the formation and propagation of early mechanical discontinuities, which in turn set up the fabric of weaknesses preferentially utilized by later fracture development. Post-depositional mechanical and diagenetic processes alter mechanical stratigraphy and rock brittleness, and thus influence fracture propagation through time.

Published
2016

10. MYSTERY AT THE RANCH.

Author

SANDELL, CLAYTON

Abstract

ROBIN ROBERTS (ABC NEWS) (Off-camera) We're gonna move on now to that ranch for troubled teams under investigation for child abuse. [ABSTRACT FROM PUBLISHER]

Published
2013

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