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

0 Followers
 · 
86 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: A landslide susceptibility zoning technique is proposed and has been tested in a catchment area of 317 km2 along the Aglar River, a tributary of the River Yamuna in the Himalayas. The Aglar catchment is characterised by varied rock types, mostly sedimentary, an active fault, landslides, moderate to intense seismic activity and moderate human influence. Very little is known about this terrain except for one previous study. This study focusses on the relationship between the terrain parameters and landslide hazard mapping. A landslide susceptibility map is presented which can serve as first generation map on which subsequent detailed information can be incorported. It is the first map of this kind from the Himalayas based on quantitative evaluation of geomorphological and geological parameters on a classified terrain database map.The study is in two stages: first, the terrain has been classified into several homogeneous patterns, followed by small physiographic units which are uniform in their characteristics throughout. Second, each unit acquires a score, from a rating system based on the degree of mutual relationship between landslides and geological attributes such as slope, distance from fault, relief, dip-slope relationship, etc.; each of which has been given weighting according to the strength of this relationship. The aim is to frame a practical database system rationally, which can be imported into a Geographical Information System for rapid digital handling of the data.A positive relationship, established between landslide and sediment yield, indicates that long term sediment production in the catchment area comes from the ongoing geological and geomorphological activity. The work may have applications in various parts of the Himalayas, especially the ungauged and unknown catchments falling in similar geological areas and latitudes.
    Engineering Geology 02/1992; DOI:10.1016/0013-7952(92)90020-Y
  • Source
    Geological Society of America Bulletin 01/1984; 95(4).

Full-text

Download
70 Downloads
Available from
Jun 3, 2014