what is the landslide type of the la conchita?

This is the only mitigation effort the town undertook. I estimate from viewing the video that high on the slope, the landslide was moving perhaps 10 m/s (30 ft/s). A block slide is a translational slide in which the moving mass consists of a single unit or a few closely related units that move downslope as a relatively coherent mass (fig. U.S. Department of the Interior | U.S. Geological Survey The landslide occurred on part of a previous landslide that occurred in 1995. The information in this publication provides an introductory primer on understanding basic scientific facts about landslidesthe different types of landslides, how they are initiated, and some basic information about how they can begin to be managed as a hazard. 4, p. 2224. Little or no newly failed material was involved in the landslide; rather, it consisted of a remobilization of the southeastern portion of the 1995 landslide deposit, involving about 200,000 m3 (250,000 yd3) (James O'Tousa, RJR Engineering, personal commun., 2005). Our editors will review what youve submitted and determine whether to revise the article. [2] The dimensions of the slides were approximately 120 meters (390 feet) wide, 330 meters (1,080ft) long, and 30 meters (98ft) deep. The Southern Pacific rail line that extends along the coastal strip was inundated by landslide debris in 1889 and again in 1909, when a train also was buried (Hemphill, 2001). 10 years after fatal mudslide, tiny La Conchita accepts the risks Please refer to the appropriate style manual or other sources if you have any questions. Below is a summary of reports and maps to identify hazards associated with different types of landslides in this part of the state. Share sensitive information only on official, secure websites.. Environmental & Historic Preservation Guidance, Real Estate, Lending or Insurance Professionals, State, Local, Tribal or Territorial Governments, Preparedness Activities, Research & Webinars, Voluntary & Community-Based Organizations, Environmental Planning & Historic Preservation, National Business Emergency Operations Center, Ventura County Public Works - Transportation Department. The landslide slumped as a coherent mass of material. Law enforcement officers and media representatives were in the area, which facilitated capturing the moving landslide on video. While every effort has been made to follow citation style rules, there may be some discrepancies. Landslides pose a recurrent hazard to humans in most parts of the world, especially in regions that have experienced rapid population and economic growth. YUARA SLUMP EARTHFLOW DEBRIS SLIDE ROCKFALL SCARP ORIGINAL LAND SURFACE -SLIP PLANE. January 10, 2005 A spread is the complex lateral movement of relatively coherent earth materials resting on a weaker substrate that is subject to liquefaction or plastic flow. Landslides occur when gravitational and other types of shear stresses within a slope exceed the shear strength (resistance to shearing) of the materials that form the slope. You also have the option to opt-out of these cookies. From December 27, 2004 through January 10, 2005, Ventura received 378 mm (14.9 in) of rainfall, only slightly less than its mean annual total of 390 mm (15.4 in) (Wofford, 2005; National Oceanic and Atmospheric Administration, 1994a, 1995a). Unfortunately, we currently lack the understanding to accurately forecast what might happen in each possible rainfall scenario. La Conchita is located on the southern California coastline midway between Ventura and Santa Barbara (fig. 1) (34.4 degrees north, 119.5 degrees west). Secure .gov websites use HTTPS Landslides are generally classified by type of movement (slides, flows, spreads, topples, or falls) and type of material (rock, debris, or earth). Debris flows include <50% fines. Landslides occur when gravitational and other types of shear stresses within a slope exceed the shear strength (resistance to shearing) of the materials that form the slope. Landslides are a type of "mass wasting" which denotes any down slope movement of soil and rock under the direct influence of gravity. In La Conchita, there was a landslide and earthflow in the spring of 1995 (see figure 1). The content on this page is copyrighted under a Creative Commons Attribution 4.0 International license. Future landslide activity could move into the same areas that recently have been damaged or could mobilize in other directions that could damage any or all of the developed area. Officials in Southern California say a coastal landslide closed a historic cultural center, shut down rail service in the area and forced the evacuation of nearby residences. In 1995, the community experienced a major slide, which damaged and destroyed a significant portion of the community. On January 10, 2005, a major landslide occurred in La Conchita. The January 2005 landslide was a debris flow that killed 10 people, and damaged 36 residential homes. The 1995 landslide had a horizontal length, vertical length, and depth of 120 x 330 x 30 m and covered approximately 10 acres with a volume of 1.3x106 m3. On January 10, 2005, a landslide struck the community of La Conchita in Ventura County, California, destroying or seriously damaging 36 houses and killing 10 people. 1). [2] The landslide occurred after a 15-day period of unprecedented records of rainfall in Southern California. Although there are multiple types of causes of landslides, the three that cause most of the damaging landslides around the world are these: Original content from Kimberly Schulte (Columbia Basin College) and supplemented by Lumen Learning. Morton, D.M., and Campbell, R.H., 1989, Cyclic landsliding at Wrightwood, southern California, in Sadler, P.M., and Morton, D.M., eds., Landslides in a semiarid environment with emphasis on the inland valleys of southern California: Inland Geological Society, Riverside, Calif., v. 2, p. 174182. 3H). This report describes my field observations and provides a description of the La Conchita area and its landslide history, a comparison of the 1995 and 2005 landslides, and a discussion of continuing landslide hazards in the La Conchita area. We also use third-party cookies that help us analyze and understand how you use this website. The deep mode of failure in 1995 is consistent with this delay: deeper landslides commonly are triggered by deep infiltration of rainfall, which can take weeks or months to occur (for example, Morton and Campbell, 1989). This mode of movement suggests that the landslide formed as a result of rising groundwater levels in response to deep infiltration of antecedent seasonal rainfall. c) Slides: A slide is the downslope movement of a soil or rock mass occurring dominantly on the surface of rupture or relatively thin zones of intense shear strain. Falls are strongly influenced by gravity, mechanical weathering, and the presence of interstitial water. In 1995, the community experienced a major slide, which damaged and destroyed a significant portion of the community. Entrapped snow and ice may also help mobilize such flows, but the unqualified term avalanche is generally used to refer only to an avalanche of snow. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. "[4], Coordinates: .mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}342150.5N 1192645W / 34.364028N 119.44583W / 34.364028; -119.44583. The 2005 landslide occurred on part of a previous landslide that occurred in 1995. Coherent blocks of material subside into the weaker substrate, and the slow downslope movement frequently extends long distances as a result of the retrogressive extension from the zone of origin, such as an eroding riverbank or coastline. In a rotational slide the axis of rotation is roughly parallel to the contours of the slope. Mudflow: A mudflow is an earthflow consisting of material that is wet enough to flow rapidly and that contains at least 50 percent sand-, silt-, and clay-sized particles. The materials may move by falling, toppling, sliding, spreading, or flowing. Chapter 12 Flashcards | Quizlet Below are publications associated with this project. The slope material liquefies and runs out, forming a bowl or depression at the head. This dynamic tectonic environment has created a spectacular landscape of rugged mountains and steep-walled valleys that compose much of the regions scenic beauty. Note the numerous landslides that have taken place in the area, including the large slide in 1995. Solved A) La Conchita, California The community of La - Chegg In particular, the extraordinary rainfall of January 1995 probably was the principal contributing factor to the elevated groundwater levels and, hence the landslide movement. The two formations are in fault contact along the active Red Mountain Fault, which extends across the slope face. Early Warning System for Southern California. In 2008, family members of those killed and or who suffered loss of property in the 2005 La Conchita Landslide filed a lawsuit against the La Conchita Ranch Co., located at the top of slope. 2 and 3) damaged five additional houses in the northwestern part of La Conchita. Rotational slide: This is a slide in which the surface of rupture is curved concavely upward and the slide movement is roughly rotational about an axis that is parallel to the ground surface and transverse across the slide (fig. In La Conchita, there was a landslide and earthflow in the spring of 1995 (see figure 1). Actually there have been several sizes, types, and ages of landslides. In 1994-1995, the seasonal rainfall at Ojai (20 kilometers (12 miles) northeast of La Conchita) from October 1 through March 3 (the day before the landslide occurred) was 761 millimeters (29.96inches), approximately twice the normal amount. Another factor that affects the shear strength of a slope-forming material is the spatial disposition of its constituent particles, referred to as the sediment fabric. The cookie is used to store the user consent for the cookies in the category "Performance". Eyewitness accounts indicate, however, that similar to 2005, dust was in the air and much of the deposit included relatively dry material. Since that time, other slides have occurred, covering at times cultivated land, roadways, and the community itself.[4]. La Conchita, coastal area of southern California. There are various direct methods of preventing landslides, such as modifying slope geometry, using chemical agents to reinforce slope material, installing structures such as piles and retaining walls, grouting rock joints and fissures, diverting debris pathways, and rerouting surface and underwater drainage.

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