Active and Dormant Landslides (Small), Elk River Watershed, California, 1940-2000
Abstract/Contents
- Abstract
- This point shapefile depicts smaller active and dormant landslides within the Elk River watershed in Humboldt County, California. Features shown here represent landslides too small to delineate at 1:24,000 scale (typically less than 1/5 acre in area or less than 150 feet in length). These features are considered historically active (estimated to have moved within approxiamtely the past 150 years). This dataset is the product of the Department of Conservation, California Geological Survey’s (CGS) investigation of landslides in the Elk River watershed. The 52 square mile study area is located in Humboldt County in northwestern California. The investigation was based on interpretation of 1940, 1941, 1948, 1954, 1962, 1965, 1984, 1988, 1996 and 2000 aerial photos, findings from CGS’s landslide mapping conducted in the early 1980s (Kilbourne, R.T. 1982-84, Manson, M. W. 1984), as well as other sources. Mapping was conducted at 1:24,000 scale. The resulting maps are titled “Geologic and Geomorphic Features Related to Landsliding, Elk River Watershed” (Plate 1) and “Relative Landslide Potential with Geologic and Geomorphic Features, Elk River Watershed” map (Plate 2). This study was conducted at a regional scale of mapping using ten sets of aerial photos combined with a compilation of earlier published and unpublished work. Other photo sets may reveal additional landslides. The regional nature of the study makes the data and maps, including the relative landslide potential zones, inappropriate as a substitute for site-specific analysis.
- Purpose
- CGS evaluated the geology, relative slope stability and geomorphic characteristics within the watershed, and compiled the digital geospatial data described in this document. This mapping and compilation is geared toward providing baseline geologic and geomorphic data to aid in responsible land management, as well as the development of watershed restoration projects, watershed management strategies, and watershed plans.
Description
| Type of resource | cartographic, software, multimedia |
|---|---|
| Form | Shapefile |
| Extent | 0.015 |
| Place | Sacramento, California, US |
| Publisher | California Geological Survey |
| Publication date | 2005 |
| Edition | 1 |
| Language | English |
| Digital origin | born digital |
| Map data | 1:24000Scale not given. ; Custom projection W 124°11ʹ25ʺ--W 123°58ʹ37ʺ/N 40°45ʹ34ʺ--N 40°38ʹ14ʺW 124°11ʹ23ʺ--W 123°58ʹ39ʺ/N 40°45ʹ27ʺ--N 40°38ʹ20ʺ, Scale not given ; EPSG::4326 |
Creators/Contributors
| Creator | California Geological Survey | |
|---|---|---|
| Creator | California. Department of Conservation | |
| Creator | Marshall, Gerald | |
| Creator | Mendes, Eric |
Subjects
| Subject | Watersheds |
|---|---|
| Subject | Geology |
| Subject | Landslides |
| Subject | California, Northern |
| Subject | Humboldt County (Calif.) |
| Subject | 1940-2000 |
| Subject | Inland Waters |
| Subject | Geoscientific Information |
| Genre | Geospatial data |
| Genre | Cartographic dataset |
Bibliographic information
| Attribute accuracy report |
Initial checking of attributes was conducted by the geologists who mapped the features. Limited field assessment of attributes was completed. The 'confidence' attribute indicates the geologist's level of
|
|---|---|
| WGS84 Cartographics | This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection. |
| Location | https://purl.stanford.edu/cg523fv1736 |
Access conditions
- Use and reproduction
- This item is in the public domain. There are no restrictions on use.
- Copyright
- This work is in the Public Domain, meaning that it is not subject to copyright.
Preferred citation
- Preferred citation
- Marshall, G., Mendes, E., California Geological Survey and California Dept. of Conservation. (2005). Active and Dormant Landslides (Small), Elk River Watershed, California, 1940-2000 California Geological Survey. Available at: http://purl.stanford.edu/cg523fv1736.
Collection
Maps and GIS data for the Elk River watershed, Humboldt County, California : watershed mapping series, map set 4
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