vector digital data
Statewide Landslide Information Database of Oregon (SLIDO) Release 2
SLIDO Release 2
Publication_Information: Publication_Place: Portland, Oregon Publisher: Oregon Department of Geology and Mineral Industries
One of the primary chronic and most devastating geologic hazards in Oregon is landslides. Average annual repair costs for landslides in Oregon exceed $10 million and severe winter storm losses can exceed $100 million (Wang and others, 2002). As population growth continues to expand and development into increased landslide susceptible terrain occurs, greater losses are likely to result. In order to begin reducing losses from landslides, large-scale endeavors are necessary at all community levels from state government to individual family homes. One successful way to reduce losses from landslides is through pre-disaster mitigation, which can be performed at many scales from statewide to local. To begin pre-disaster mitigation of landslides, the landslide hazard must be located. Once the hazard is located the population and infrastructure vulnerable to the hazards can be identified and the risk mitigated. In order to improve our understanding of the landslide hazard in Oregon the Statewide Landslide Information Database of Oregon (SLIDO) was created. The four main objectives of this study were 1) identify previously mapped landslide deposits statewide, 2) improve the understanding of landslide hazards throughout Oregon, 3) improve the abilities of communities to begin effective landslide management and risk reduction activities, and 4) recommend future improvements and updates to the database.The goals of SLIDO Release 2 were 1) update SLIDOr1, 2) improve historically active landslide portion of the database through review of local municipality (city or county) data, 3) compile references that have detailed data on regionally significant or typical landslides, 4) add non-spatial data related to landslides such as landslide type, activity, certainty of identification, process, estimated age, etc. in specified areas, 5) populate and convene an Oregon Framework Implementation Team (FIT) landslide element subcommittee to develop standards for the statewide landslide theme. Also develop the landslide element stewardship standard.
Worldwide, landslides are one of the most devastating natural, and sometimes human-induced, disasters causing billions of dollars in property damage and thousands of deaths every year (Hong and others, 2007). Landslides in the United States cause an average of 25 - 50 deaths and $1 to $2 billion in economic losses annually (Schuster and Fleming, 1986).
Many parts of Oregon are highly susceptible to landslides which pose significant threats to people and infrastructure particularly in the portions of the state with moderate to steep slopes. As population growth expands and development onto landslide susceptible terrain occurs, greater losses are likely to result. Most of Oregon’s landslide damage has been associated with severe winter storms where landslide losses exceed $100 million in direct damage (such as the February 1996 event—see FEMA, 1996). However, landslides are a chronic hazard in Oregon and annual average maintenance and repair costs for landslides in Oregon are over $10 million (Wang and others, 2002). Landslides induced by earthquake shaking are likely in many parts of Oregon, and losses associated with sliding in moderate-to-large earthquakes are likely to be significant. Volcanic induced and/or associated landslide hazards are also potential threats to parts of Oregon.
Some recent research at the Oregon Department of Geology and Mineral Industries (DOGAMI) was performed to choose the best remote sensing dataset (i.e. aerial photos, photogrammetric elevation data, LIDAR elevation data, etc.) to use as a primary tool to begin systematic mapping of landslides in Oregon. One of the conclusions of this study was to systematically compile all previously mapped landslides from geologic and hazard maps. This database would then serve as a starting place for all future landslide studies (Burns, 2007).
In order to improve our understanding of the landslide hazard in Oregon and to create a statewide base level of landslide data, this database of previously mapped landslides, the Statewide Landslide Information Database of Oregon (SLIDO) was created.
The body of this report describes the methodologies used to update the database. This study was partially funded by the U.S. Geologic Survey (USGS) Landslide Hazards Program.
SLIDO was created through the compilation of the best data available. Several limitations are worth noting, and underscore that any hazard map is generally useful for regional applications but should not be used as an alternative to site-specific studies in critical areas.
1. Although it every effort was made to ensure that digitization and database entry were accurate and complete, no effort was made to verify the original data on which the compilation is based. Geologic data in the less populated eastern portions of the state were particularly limited in terms of scale, for example the 1:500,000 scale geologic map of the state was used in some locations.
2. As previously discussed, the developed database is from original sources that vary in scale, original purpose of mapping, available tools at the time of mapping, and background and interpretation by original mapper. These factors all affect the level of detail and accuracy of the landslides.
4. We neither collected, nor analyzed any new data to create this map. Therefore, this database is a snapshot view of the current data.
Oregon Department of Geology and Mineral Industries
William J. Burns
800 N.E. Oregon Street, Suite 177
8:30 am to 4:30 pm PST
William Burns, Ian Madin, Lina Ma, Katherine Mickelson, Evan Saint-Pierre
Microsoft Windows Server 2008 R2 Version 6.1 (Build 7600) ; ESRI ArcGIS 10.0.0.2414
GT-polygon composed of chains
Lambert Conformal Conic43.00000045.500000-120.50000041.7500001312335.9580050.000000
North American Datum of 1983
Geodetic Reference System 80
Internal feature number.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
Area of feature in internal units squared.
Positive real numbers that are automatically generated.
Nature of the Northwest Information Center
800 N.E. Oregon Street, Suite 177
9 am to 5 pm PST
See access and use constraints information.
FGDC Content Standard for Digital Geospatial Metadata