Landslide Activity, Freshwater Creek Watershed, California, 1942-1999
Abstract/Contents
- Abstract
- This point shapefile depicts landslide activity within the Freshwater Creek watershed in Humboldt County, California between 1942 and 1999 at 1:24,000 scale. These data were derived from digital maps of landslide potential and geologic features in Humboldt County originally published in 1999 by the California Division of Mines and Geology (OFR 99-10 and OFR 99-10a). The data for the original mapping were compiled from multiple sources including published maps and reports, aerial photograph mapping, and reconnaissance geologic mapping.
- Purpose
- The maps/data are useful in preparation of Timber Harvesting Plans, and for use by land managers for identifying areas of potentially unstable ground. The maps/data serve as a guide to potential problem areas where more site-specific review is required.
Description
Type of resource | cartographic, software, multimedia |
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Form | Shapefile |
Extent | 0.003 |
Place | Sacramento, California, US |
Publisher | California Geological Survey : California. Dept. of Conservation. |
Publication date | 2002 |
Edition | 1 |
Language | English |
Digital origin | born digital |
Map data | 1:24000Scale not given. ; Custom projection W 124°5ʹ16ʺ--W 123°58ʹ23ʺ/N 40°47ʹ27ʺ--N 40°42ʹ12ʺW 124°5ʹ6ʺ--W 123°58ʹ30ʺ/N 40°47ʹ19ʺ--N 40°42ʹ19ʺ, Scale not given ; EPSG::4326 |
Creators/Contributors
Creator | California Geological Survey | |
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Creator | California. Division of Mines and Geology |
Subjects
Subject | Faults (Geology) |
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Subject | Landslides |
Subject | Watersheds |
Subject | Landslide hazard analysis |
Subject | California, Northern |
Subject | Humboldt County (Calif.) |
Subject | Freshwater Creek (Calif.) |
Subject | Inland Waters |
Subject | Geoscientific Information |
Genre | Geospatial data |
Genre | Cartographic dataset |
Bibliographic information
Supplemental information |
The discussion below was excerpted from OFR 99-10 and 99-10a. The geology of the drainage is dominated by the Freshwater Fault. This fault is
Much of the western half of the drainage has relatively steep topography underlain by
The geology of the eastern half of the drainage is complex and most of the larger
The remainder of the eastern half is dominated by a series of northeast-dipping
The characteristics and properties of the various rock units found in this area were
The Relative Landslide Potential Map has been prepared to aid in resource management and
This map is derivative, based on the following: 1) the occurrence and distribution
Studies of the stability of specific sites commonly require development of quantitative
The broad apparent stability characteristics of geological materials underlying
Steepness of slopes, whether or not landslides are apparent. The presence of active or intermittent natural influences that tend to cause
The map, Landslide Potential with Geologic and Geomorphic Features, Freshwater Creek,
Purpose: The maps/data are useful in preparation of Timber Harvesting Plans, and for use by land
As noted previously, geomorphic features were mapped on stereo pair photographs and
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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/xb539vj7108 |
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
- California Division of Mines and Geology and California Geological Survey. (2002). Landslide Activity, Freshwater Creek Watershed, California, 1942-1999. California Dept. of Conservation and California Geological Survey. Available at http://purl.stanford.edu/xb539vj7108.
Collection
Maps and GIS data for the Watersheds mapping series. Map set 3, Digital representation of OFR 99-10 & OFR 99-10a, Freshwater Creek, Humboldt County, California
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