USGS Geoscience Data Catalog
Additional USGS Geoscience data can be found by geographic location or by publication series.
DATABASE FOR LARGE LANDSLIDE DEPOSITS (PF-SLID_UM): EXPORT FORMAT FILE NAME QUADRANGLE NAME of98-792_3a.e00.gz Mindego Hill of98-792_3b.e00.gz Cupertino of98-792_3c.e00.gz Franklin Point of98-792_3d.e00.gz Big Basin of98-792_3e.e00.gz Castle Rock Ridge of98-792_3f.e00.gz Los Gatos of98-792_3g.e00.gz Año Nuevo of98-792_3h.e00.gz Davenport of98-792_3i.e00.gz Felton of98-792_3j.e00.gz Laurel of98-792_3k.e00.gz Loma Prieta of98-792_3l.e00.gz Mount Madonna of98-792_3m.e00.gz Santa Cruz of98-792_3n.e00.gz Soquel of98-792_3o.e00.gz Watsonville West of98-792_3p.e00.gz Watsonville East of98-792_3q.e00.gz Chittenden DATABASE FOR ANNOTATION ON LARGE LANDSLIDES (PF-ANNO_UM): EXPORT FORMAT FILE NAME QUADRANGLE NAME of98-792_4a.e00.gz Mindego Hill of98-792_4b.e00.gz Cupertino of98-792_4c.e00.gz Franklin Point of98-792_4d.e00.gz Big Basin of98-792_4e.e00.gz Castle Rock Ridge of98-792_4f.e00.gz Los Gatos of98-792_4g.e00.gz Año Nuevo of98-792_4h.e00.gz Davenport of98-792_4i.e00.gz Felton of98-792_4j.e00.gz Laurel of98-792_4k.e00.gz Loma Prieta of98-792_4l.e00.gz Mount Madonna of98-792_4m.e00.gz Santa Cruz of98-792_4n.e00.gz Soquel of98-792_4o.e00.gz Watsonville West of98-792_4p.e00.gz Watsonville East of98-792_4q.e00.gz Chittenden DATABASE FOR SMALL LANDSLIDE DEPOSITS (PF-SMLS_UM): EXPORT FORMAT FILE NAME QUADRANGLE NAME of98-792_5a.e00.gz Mindego Hill (no Cupertino layer) of98-792_5c.e00.gz Franklin Point of98-792_5d.e00.gz Big Basin of98-792_5e.e00.gz Castle Rock Ridge of98-792_5f.e00.gz Los Gatos of98-792_5g.e00.gz Año Nuevo of98-792_5h.e00.gz Davenport of98-792_5i.e00.gz Felton of98-792_5j.e00.gz Laurel of98-792_5k.e00.gz Loma Prieta of98-792_5l.e00.gz Mount Madonna of98-792_5m.e00.gz Santa Cruz of98-792_5n.e00.gz Soquel of98-792_5o.e00.gz Watsonville West of98-792_5p.e00.gz Watsonville East of98-792_5q.e00.gz Chittenden ***Line and polygon ARCVIEW shape files bundled as one tar file. When opened, the tar file >yields*** line files pf-arc.dbf, pf-arc.shp, and pf-arc.shx polygon files pf-poly.dbf, pf-poly.shp, and pf-poly.shx line files pf-anno.dbf, pf-anno.shp, and pf-anno.shx point files pf-smls.dbf, pf-smls.shp, and pf-smls.shx ARCVIEW SHAPEFILE NAME QUADRANGLE NAME of98-792_6a.tar.gz Mindego Hill of98-792_6b.tar.gz Cupertino of98-792_6c.tar.gz Franklin Point of98-792_6d.tar.gz Big Basin of98-792_6e.tar.gz Castle Rock Ridge of98-792_6f.tar.gz Los Gatos of98-792_6g.tar.gz Año Nuevo of98-792_6h.tar.gz Davenport of98-792_6i.tar.gz Felton of98-792_6j.tar.gz Laurel of98-792_6k.tar.gz Loma Prieta of98-792_6l.tar.gz Mount Madonna of98-792_6m.tar.gz Santa Cruz of98-792_6n.tar.gz Soquel of98-792_6o.tar.gz Watsonville West of98-792_6p.tar.gz Watsonville East of98-792_6q.tar.gz Chittenden
Roberts, Sebastian, Baron, Andrew D. , Brabb, Earl E. , and Pike, Richard J. , 1998, Digital Compilation of "Preliminary Map of Landslide Deposits in Santa Cruz County, California, By Cooper-Clark and Associates, 1975": A Digital Map Database: U.S. Geological Survey Open-File Report 98-0792.Online Links:
This is a vector data set. It contains the following vector data types (SDTS terminology):
The horizontal datum used is NAD27.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.
The flattening of the ellipsoid used is 1/294.98.
Value | Definition |
---|---|
D | definite landslide deposit |
P | probable landslide deposit |
? | questionable landslide deposit |
(blank) | landslide without any attribute |
R | a modifier added to one of the above values for landslide features that strongly suggest a rapid rate (several feet per second to over 100 feet per second) of landslide movement |
nls | No landslide deposits |
Value | Definition |
---|---|
contact, certain | arcs delineating large (greater than 500 feet) landslide polygons |
topographic escarpment | inferred main scarp on large landslides |
county boundary | Santa Cruz County boundary |
scratch boundary | questionable boundary added during digital compilation |
map boundary | quadrangle and sheet boundary |
water boundary | water boundary on the coastline |
Value | Definition |
---|---|
arrow, certain | arrow showing downslope movement on large landslides |
Value | Definition |
---|---|
D | definite landslide deposit |
P | probable landslide deposit |
? | questionable landslide deposit |
(blank) | landslide without any attribute |
R | a modifier added to one of the above values for landslide features that strongly suggest a rapid rate (several feet per second to over 100 feet per second) of landslide movement |
nls | No landslide deposits |
Knowledge of the distribution and type of landslides present in a region is one of the kinds of geologic information necessary for more effective land--use planning. This map provides such information. It is a preliminary map of known and suspected landslides prepared by stereoscopic analyses of high and intermediate level aerial photographs. Although prepared and published without the benefit of field checking for accuracy and completeness, this map is useful because it has quickly provided needed landslide information for immediate use in making land--use decisions.
Associates, Cooper-Clark and , 1975, Preliminary map of landslide deposits in Santa Cruz County, CA,.
Reliability of interpretations can be affected by the skill and experience of the aerial photo interpreters. Interpretations for this map were made by personnel with 5 to 10 years of aerial photo interpretation experience. The map, therefore, reflects the current state--of--the--art regarding interpretation of landforms of landslide origin from aerial photographs. Most of the landslide deposits shown on this map were interpreted from aerial photographs taken in 1963 and in 1970. This map is no more detailed than the aerial photographs and maps used. For this reason, small localized slides may be present which are not shown on the maps and some larger slides may not be shown because they are obscured by dense forest cover.
The mapped area only shows landslide deposits and doesn't show any bedrock geology.
The digital compilation was derived from linework inked directly by the authors on 17 USGS mylar greenline 7.5-minute (1:24,000-scale) quadrangle maps that cover Santa Cruz County.
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- Use_Constraints: none
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US Geological Survey Open-File Report 98-0792
This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
This database, identified as 'Preliminary Map of Landslide Deposits in Santa Cruz County, California: A Digital Map Database', has been approved for release and publication by the Director of the USGS. Although this database has been reviewed and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. This database is released on condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from its use.
Map can be downloaded as a 5.8 megabyte PostScript file from <http://geopubs.wr.usgs.gov/open-file/of98-792_9a.ps.gz>
Map can also be downloaded as a 7.8 megabyte PDF file from <http://geopubs.wr.usgs.gov/open-file/of99-14/of98-792_9b.pdf>
Data format: | Includes the database for large and small landslide deposits and the annotation on large landslides for all quadrangles in the Santa Cruz county, CA. These can be downloaded in both ARC/INFO export format and ARCVIEW shapefiles format. in format Gzipped TAR containing either ARC/INFO export files or ARCVIEW shapefiles. (version ARC/INFO version 7.1.1) Size: Each file is less than 1 megabyte. |
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Network links: |
<http://geopubs.wr.usgs.gov/open-file/of98-792/> |
Geologic map data file(s) and/or plot file (s) can be obtained by sending a tape with request to:
San Francisco Bay Geologic Materials Database c/o Database Coordinator U.S. Geological Survey 345 Middlefield Road, MS 975 Menlo Park, CA 94025
The file (s) will be returned on the tape. The acceptable tape types are:
4.3 or 5.0 GB, 8 mm Exabyte tape.
703-648-6974 (voice)
703-648-6560 (FAX)
pschweitzer@usgs.gov