Article

Los deslizamientos de la carretera de cuota Tijuana-Ensenada, Baja California

GEOS 09/2000; 20(4):418-432.

ABSTRACT

418 INTRODUCCIÓN La región del norte de la península de Baja California y sur de California se caracteriza por la presencia de fallas regionales activas orientadas NW-SE (Legg et al., 1991) que, en gran me-dida, son responsables de la inestabilidad de zonas con impor-tante desarrollo urbano. Entre Tijuana y aproximadamente 75 km al sur de Ensenada, la costa occidental de la península mues-tra el desarrollo de acantilados que evidencian un importante levantamiento tectónico (Rockwell et al.,1989). Por medio de perfiles sísmicos de reflexión, en el borde continental de la penísnula se ha documentado que las fallas cercanas a la costa afectan a sedimentos cuaternarios (Legg, 1991; Legg et al., 1991). La deformación general del noroeste de Baja California está gobernada por el Sistema San Andrés-Golfo de California. En su interior se han identificado fallas que pueden generar sismos hasta de magnitud 7 (Frez y González, 1991). Aunque la activi-dad sísmica en el área de estudio es de baja magnitud, es impor-tante, debido a la inestabilidad propia del terreno, como conse-cuencia de las pronunciadas pendientes en algunas zonas y de la poca competencia de algunas unidades litológicas que floran ampliamente en la región. En la zona de Ensenada-Salsipuedes, donde se localiza la carretera de cuota Tijuana-Ensenada, es importante la sismicidad asociada con la Falla San Miguel, localizada hacia el oriente (Legg et al., 1991). La actividad predominante para la región de Salsipuedes es de enjambres (Wong et al., 1987). En esta región, el fallamiento dominante reciente está orientado hacia el NW y es de desplazamiento lateral y normal (Cruz-Castillo y Delgado-Argote, 1999). El fallamiento normal se observa en toda la zona de estudio, afectando la columna estratigráfica

Download full-text

Full-text

Available from: Luis Delgado-Argote
  • Source
    • "In the city of Ensenada, Baja California in Mexico, flooding occurs mainly because of the lack of storm drains, where landslides are mainly induced by the weight of the increased construction of low-cost housing developments with no impact studies beforehand. A previous landslide study was done by Cruz-Castillo et al. [2], for a small sector of the Tijuana-Ensenada Toll Road, in the Ensenada county, indentifying that engineering works and anthropogenic factors are the main causes for the sliding; in addition, the geologic characteristics of the region indicate that it was subject to early sliding; however, in less than a year after the road was constructed, sliding occurred that caused the destruction of some houses that were built on top of the hill, which suggest that the main problem in this section was the decisions taken when constructing the Toll Road. Since that time, maintenance has become necessary to compensate for the continuous road subsidence. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The overall objective of this project is to produce maps identifying potential landslide hazard areas in the city of Ensenada, Baja California Mexico. In this paper we present the results of the granulometric analysis for 7 soil samples of different sites in the city that are subject to landslide or rock displacement hazard. We also present the tests done on the physical sliding model and a comparison between the sites and the model observations. The results show some consistency between the sliding model and the field observations. Keywords: landslides, physical modelling, natural hazards. 1 Introduction Landslides are known for its fierce consequences in the number of deaths. In Brazil, more than 500 people were reported to have died after torrential rains triggered mud avalanches in Teresopolis and neighbouring areas north of Rio de Janeiro; some of the areas were illegally occupied by houses built by their occupants on steep hillsides. In Oaxaca, Mexico, on the 28th of January of 2011, a landslide devastated the State, mainly the town of Santa Maria Tlahuitoltepec leaving approximately 1500 houses with damages and 25000 victims [1]. On the North-western part of Universidad Auton ma de Baja California, Campus Ensenada, México
    Preview · Conference Paper · May 2011