The landslide area was approximately 350 m (1,150 ft) long and 80100 m (260330 ft) wide. The 11ha (28acre) community was first established in 1924 when subdivision created about 200 lots that mostly contain singlefamily residences. These types of landslides take weeks, even months, to happen. There were 10 confirmed fatalities. What type of slide is the La Conchita slide? Do you know what type of landslide occurred in La Conchita? The landslide occurred after a 15-day period of unprecedented records of rainfall in Southern California. How many people died in the landslide on Rincon Mountain? From December 27, 2004, through January 10, 2005, the nearby city of Ventura received 378 millimeters (14.9inches) of rainfall, only slightly less than its mean annual total of 390 millimeters (15.4inches). If people continue to live in La Conchita, more lives will . Once the smoke clears from a wildfire, the danger is not over!! Actually there have been several sizes, types, and ages of landslides. 3I). This is a typical type of landslide. The worst of these was the tragic slide on January 10, 2005 when a huge rain-caused side killed 10 residents. Inspection of the site within a few hours of the landslide indicated that much of the deposit consisted of fairly dry material (James O'Tousa, RJR Engineering, personal commun., 2005). In 2005, an additional landslide occurred at the end of a 15day period of near-record rainfall levels. 7). Debris-flow source areas are often associated with steep gullies, and debris-flow deposits are usually indicated by the presence of debris fans at the mouths of gullies. Our editors will review what youve submitted and determine whether to revise the article. The neighborhood of La Conchita has suffered from large landslides in the recent past that have wiped out homes and even killed people. 2 and 3) damaged five additional houses in the northwestern part of La Conchita. 1995 La Conchita, California, landslide. Contact between the flowing mass and the underlying material can be distinct, or the contact can be one of diffuse shear. This indicates that the landslide material, although it flowed rapidly, was quite viscous and pushed structures in front of it rather than flowing around them or filling them with mud, as sometimes occurs with fully saturated debris and mud flows. A) La Conchita, California The community of La Conchita in Ventura County, California experiences frequent landslides. The landslide entered the La Conchita neighborhood destroying 13 houses and severely damaging 23 others (figs. Maps displaying where shallow landslides are most likely to occur are based on observation of previous landslide activity, topographic slope, and information on the bedrock material (seePreliminary soil-slip susceptibility maps, southwestern California-Open-File Report 2003-17). Debris flow: A debris flow is a form of rapid mass movement in which a combination of loose soil, rock, organic matter, air, and water mobilize as a slurry that flows downslope (fig. The La Conchita landslides that occurred in 1995 and 2005 form only a small percent of a much larger landslide complex, according to the geologists. landslide, also called landslip, the movement downslope of a mass of rock, debris, earth, or soil (soil being a mixture of earth and debris). 3A). In 2005, an additional landslide occurred at the end of a 15day period of near-record rainfall levels. The lush, green vegetation visible in the southeastern (lower right in photograph) part of the 1995 deposit clearly indicates that drainage on and within the 1995 landslide deposit concentrated water in the part of the mass that failed in 2005.
