Deslizamientos complejos que afectan a la población de San Antonio de Pascua, Siquirres, Costa Rica

Peraldo, Giovanni; Badilla, Elena; Camacho, Johanna; Morera, María Lourdes; Chávez, Ignacio; Valverde, Wagner; Sánchez, Dennis

doi:10.17141/letrasverdes.11.2012.913

Cited by 2 publications

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“…En la figura 2 (Quebrada Lajas, en coordenadas Lambert 219,45-568,80), se pueden observar formas que corresponden a reptación severa del Deslizamientos históricos en las cercanías de Guayabo, (Peraldo & Rojas, 2000) terreno y fracturas de la ladera que pueden relacionarse con activación de deslizamientos de pequeña escala, definiendo coronas laterales. El deslizamiento Torito (fig 3, coordenadas Lambert 219,7-569,25) pone en peligro la actividad agrícola del área y la ruta hacia Torito.…”

Section: Información Históricaunclassified

Geo-arqueología del Monumento Nacional Guayabo (MNG), Turrialba, Costa Rica

Obando

Peraldo

2011

Rev. Geol. Amér. Central

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ABSTRACT:The geoarchaeology evaluation of the Monumento Nacional Guayabo (M.N.G.) shows the following problems: the water, with pH 5,5-6,0 or 7, flows over the rocks paths, it is a chronic problem, the cause could be springs, aqueduct collapse, poor soil infiltration. The low pH, could cause colored precipitates. The abundant flora, like lichens, have covered the rock and other geoarchaeological features. The lichens could damage the lithic and glyphs. The geological study, shows regional and big landslides, but the M.N.G. seems to be stable and there are not in the Monument itself. The petrography shows a basaltic-andesite rocks with glass matrix. It means that the rock is easily eroded. The fluidal texture produces natural laminations. It is means no harmful rocks just it is a natural feature. Key words: geoarchaeology, petrography, basaltic-andesite, Turrialba volcano, mud flows, landslices, lithology RESUMEN: La evaluación geoarqueológica del Monumento Nacional Guayabo (M.N.G.) mostró, lo siguiente: problemas con aguas de inundación pasiva, con pH bajos de 5,5-6,0 hasta 7, en las calzadas, lo cual parece ser un problema crónico, la causa puede ser descargas de manantiales, colapso del acueducto o pobre infiltración de suelo. Proliferación descontrolada de líquenes que ya han cubierto por completo rocas y objetos arqueológicos, probablemente los líquenes son encostrantes deteriorando la lítica. Desde el punto de vista geodinámica externa, se han observado deslizamientos de tierra y roca. El sitio M.N.G, no tiene evidencia de deslizamientos recientes y se encuentra asentado en un área estable. La petrografía muestra que las rocas son andesitas-basálticas con mucho vidrio en la matriz y de textura fluidal, lo cual generan laminaciones y lajamientos, tales rasgos no deben ser necesariamente interpretados como lítica en deterioro.

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Section: Información Históricaunclassified

Geo-arqueología del Monumento Nacional Guayabo (MNG), Turrialba, Costa Rica

Obando

Peraldo

2011

Rev. Geol. Amér. Central

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“…The first group includes the characteristics of the natural environment, such as climate, soils, type of rock, seismic events, etc. While anthropic factors constitute all those human activities that alter the natural conditions of the site, such as infrastructure development, earthworks, landfills, cuts or any productive activity that involves soil manipulation [2]. Geological processes gradually alter the structure of the geographic space, compared to human actions that modify the physical environment more rapidly over time.…”

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Characterization of landslide and measurement of ground vibration period in the Salado-Paccha sector using GNSS equipment and refraction seismic testing

Román,

Almache

2024

MATEC Web Conf.

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A landslide is a soils movement that depending on its level can be a very risky event, causing from material losses to human lives in some occasions. It can occur naturally or by anthropogenic means, the main causes are usually high intensity rainfall, soils with poor geomechanical characteristics, considerable seismic movements, erosion, lack of vegetation cover, among others. Paccha is a parish where there are several active landslides that put its inhabitants and their material goods at risk. As a result, this research analyzes one of them with UTM17s, 728845,38 E 9679536,46 N coordinates, located in the El Salado sector, for its study it is intended to characterize it, measuring its displacement and velocity through a monitoring of 36 days in 3 data collection campaigns with GNSS equipment using the RTK method, in addition a seismic refraction test is used to measure the period of vibration of the soil at the site. The results obtained indicate that the soil in the sector is clay and silt of high plasticity, the slip is extremely slow, semi-deep, with lateral propagation and rotational geometry. The displacement between points is 4,14 cm while the velocity is 0,43 m/year, finally the vibration period corresponds to a value of 0,13s and the shear wave velocity Vs is 178,85, which is categorized as a type E soil.

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Deslizamientos complejos que afectan a la población de San Antonio de Pascua, Siquirres, Costa Rica

Abstract: Letras Verdes es un espacio abierto a diferentes formas de pensar los temas socioambientales. Las opiniones vertidas en los artículos son de responsabilidad de sus autores.

Cited by 2 publications

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Geo-arqueología del Monumento Nacional Guayabo (MNG), Turrialba, Costa Rica

Geo-arqueología del Monumento Nacional Guayabo (MNG), Turrialba, Costa Rica

Characterization of landslide and measurement of ground vibration period in the Salado-Paccha sector using GNSS equipment and refraction seismic testing

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