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

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

doi:10.15517/rgac.v0i47.6496

Cited by 3 publications

(10 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A current problem in the MASS is the urbanization of the badland areas where landfills (usually for housing projects) is a normal procedure [2]. During the past earthquakes, settlements and collapse were observed in the landfill areas of TBJ.…”

Section: Properties Of Tierra Blanca Joven (Tbj)mentioning

confidence: 99%

“…The MASS stratigraphy consists mainly of the San Salvador formation, product [1,2] of the late Pliocene-Quaternary Central American Volcanic Front volcanoes. The more important strata are: the tephras TB4, TB3, TB2 (between them exist paleosoils) and Tierra Blanca Joven (TBJ) which are eruptive products of the Ilopango Caldera; also strata from the San Salvador stratovolcano like G1, G2 including different lava flows and ash falls are included.…”

Section: Introductionmentioning

confidence: 99%

“…The more problematic region, because of mass wasting processes ( Fig.1), is located on the extent and thick deposits of the volcanic tuffs called Tierra Blanca Joven (TBJ) which is an unconsolidated product of the last plinian eruption of the Ilopango Caldera [2]. Several authors [2][3][4][5][6][7][8] have dealt with the hazards, current geological and geotechnical knowledge in the MASS, focusing mainly in the Tierra Blanca Joven tephras (TBJ) (unsaturated material); indicating the decrease of strength, and collapsibility of TBJ when saturation reduces the suction and cementation.…”

Section: Introductionmentioning

confidence: 99%

“…Several authors [2][3][4][5][6][7][8] have dealt with the hazards, current geological and geotechnical knowledge in the MASS, focusing mainly in the Tierra Blanca Joven tephras (TBJ) (unsaturated material); indicating the decrease of strength, and collapsibility of TBJ when saturation reduces the suction and cementation. Reference [9] says that in many parts of the world soils are classified as "problematic" because of the difficulties that occur before and after the construction of foundations or roads, as well as on slopes because excessive deformation occur, which may produce undesirable swelling, settlement or collapse.…”

Section: Introductionmentioning

confidence: 99%

“…Because of its young age [2] TBJ is not affected by intense weathering. However is possible to observe oxidation traces (iron oxides), which mark the areas of the water preferred pathway in TBJ.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Unsaturated Volcanic Tephra and Its Effect for Soil Movement in El Salvador

Chávez¹

2013

EARTH

View full text Add to dashboard Cite

Abstract:In El Salvador during the rainy season or when major earthquakes affect the area, processes like mass movements, liquefaction, erosion and floods affect the territory leaving environmental, social and economic damages. The volcanic tephras called "Tierra Blanca Joven" (TBJ) which is a product of the last plinian eruption of the Ilopango Caldera are the more problematic region in the Metropolitan Area of San Salvador. In El Salvador during the summer and rainy season the groundwater level remains low in most of the areas, this means that the soils in the country are unsaturated and there are capillary forces that act on the soil structure making that an "apparent cohesion" (suction) improve the strength of the soil; this circumstance makes that the slopes are almost vertical and temporally stable, but will collapse when wetted or during seismic events. To that problematic is possible to add that the majority of the water pipelines are in bad condition and when they fail is possible to expect the collapse of entire streets or houses. Wetting of the soil is likely to occur following construction development, because evaporation is reduced by covering the ground surface with a structure. For unsaturated soils the use of two independent stress variables: net stress and suction are needed. Suction values of TBJ "G" unit of the proximal facie were obtained using pressure plate, tensiometer and filter paper to obtain a Soil-Water Retention Curve (SWRC); the use of this curve into finite elements software can help to obtain the shear strength and permeability properties. For monitoring, the use of Quickdraw tensiometers (suction) and TMS3 (soil moisture content) is proposed, because it could be a way to build a field methodology for early warning system for the slopes for urban planning and risk assessment.

show abstract

Section: Properties Of Tierra Blanca Joven (Tbj)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Unsaturated Volcanic Tephra and Its Effect for Soil Movement in El Salvador

Chávez¹

2013

EARTH

View full text Add to dashboard Cite

show abstract

Cuidado y preservación del medio ambiente escolar en la IED Rodrigo Vives de Andréis

Bolaño

2018

CULT. ED. SOC

View full text Add to dashboard Cite

2D FEM Numerical Prediction of Local Seismic Effects at San Salvador Municipality (El Salvador) Induced by 2001 Earthquakes

Faraone

Caravaggio

Chávez³

et al. 2023

Geosciences

View full text Add to dashboard Cite

San Salvador Metropolitan Area (MASS) is an urbanized territory in the country of El Salvador, located between the San Salvador volcano and the Ilopango caldera, in a sub-flat area called “Valle de las Hamacas” (Valley of the Hammocks). The high seismicity of this area is due to the subduction zone of the Cocos plate that causes strong seismic events such as the earthquakes that occurred on 13 January (7.6 Mw) and 13 February 2001 (6.6 Mw). As part of the international cooperation project between Italy (AICS) and El Salvador University, the CASTES project focussed on natural hazards in the territory of El Salvador was launched. Therefore, 2D simulations are carried out along two sections to evaluate the Local Seismic Response (LSR) in the Southeast part of MASS territory. Results show spatially variable amplifications (from 3 to 6.5) in the period ranging 0.1–0.7 s and evidence of lateral FA variations that can be calculated only through 2D numerical analyses. Two amplified periods are recognised, 0.1–0.5 s and 0.4–0.8 s, due to the presence of two types of subsoil volcanic deposits: the shallow and soft Tierra Blanca deposits and the deeper and stiffer Volcanic ash and Tuff.

show abstract

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

Cited by 3 publications

References 12 publications

Unsaturated Volcanic Tephra and Its Effect for Soil Movement in El Salvador

Unsaturated Volcanic Tephra and Its Effect for Soil Movement in El Salvador

Cuidado y preservación del medio ambiente escolar en la IED Rodrigo Vives de Andréis

2D FEM Numerical Prediction of Local Seismic Effects at San Salvador Municipality (El Salvador) Induced by 2001 Earthquakes

Contact Info

Product

Resources

About