Online Links:
Table 2. Location description code (digit one). [The number after the alphabetical code indicates the total number of gravity stations for which the code was used.] B 45 On level-line benchmark incorporated into U.S. Geological Survey vertical control system. N 14 Near benchmark. P 188 Location of surveyed elevation. X 5 Near location markers such as section corners. D 1 Near assumed location of any of the above markers that were destroyed or not found. R 1 Lake or reservoir elevation determined from leveling to benchmark. F 32 Near a location with or without a marker at which a surveyed elevation is indicated on a published topographic map. G 58 Near a location (on a manuscript map or a published map) at which spot elevations are determined by photogrammetry or near a doubtful F-location. W 12 Near edge of lake or canal; interpolated elevation or elevation given for water at unknown height relative to present level. Table 3. Accuracy of elevations (digit two). [The number after the numerical code indicates the total number of stations for which the code was used. Note that uncertainty of horizontal location tends to reduce the elevation accuracy]. Code Number Accuracy (feet) 1 230 0.1 On benchmark; surveyed elevation 2 10 0.5 Elevation difference hand-leveled to nearby benchmark 3 7 1 Near benchmark or checked water level 4 2 2 Near assumed location of benchmark that was not found 5 70 5 Near location with 10-foot contour interval 6 36 10 Photogrammetric elevation on map with 20-foot contour interval 7 1 20 Uncertain location of spot elevation point Table 4. Accuracy of horizontal location (digit three). [The number after the numerical code indicates the total number of stations for which the code was used.] Code Number Accuracy (feet) 2 252 84 Near section corners and benchmarks; surveyed locations 3 80 210 Near road intersection, stream crossings, hillcrests 4 22 420 Road curve; uncertain spot elevation location 5 2 840 Location depends on odometer measurement or other estimate Table 5. Accuracy of observed gravity (digit four). [The number after the numerical code indicates the total number of stations for which the code was used. Accuracies are relative to the value at the Adel base station.] Code Number Accuracy (mgal) 2 3 0.02 Reading repeated several times 3 8 0.05 Repeated reading 4 345 0.10 Non-repeated reading
| Range of values | |
|---|---|
| Minimum: | 42.0021670 |
| Maximum: | 42.4456670 |
| Units: | decimal degrees |
| Range of values | |
|---|---|
| Minimum: | -120.0813330 |
| Maximum: | -119.7083330 |
| Units: | decimal degrees |
| Range of values | |
|---|---|
| Minimum: | 4466.70 |
| Maximum: | 6047.00 |
| Units: | feet |
| Range of values | |
|---|---|
| Minimum: | 919882.550 |
| Maximum: | 979969.240 |
| Units: | mGal |
| Range of values | |
|---|---|
| Minimum: | -35.050 |
| Maximum: | 27.410 |
| Units: | mGal |
| Range of values | |
|---|---|
| Minimum: | -0.070 |
| Maximum: | 2.750 |
| Range of values | |
|---|---|
| Minimum: | 0.570 |
| Maximum: | 7.300 |
| Range of values | |
|---|---|
| Minimum: | -188.380 |
| Maximum: | -161.080 |
| Units: | mGal |
| Range of values | |
|---|---|
| Minimum: | -178.610 |
| Maximum: | -151.400 |
| Units: | mGal |
Geophysical information republished in improved formats because the information was otherwise difficult to obtain. Original study was conducted in support of the resource appraisal of the Crump Geyser Known Geothermal Resource Area (KGRA). This area was designated as a KGRA by the USGS, and this designation became effective on December 24, 1970 (Godwin, and others, 1971). The land classification standards for a KGRA were established by the Geothermal Steam Act of 1970 (Public Law 91-581). Federal lands so classified required competitive leasing for the development of geothermal resources.
Are there legal restrictions on access or use of the data?Access_Constraints: none
Use_Constraints: none
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.
| Data format: | Principal facts from gravity stations in format Shapefile (version 1.0) |
|---|---|
| Network links: |
http://pubs.usgs.gov/of/2006/1110/2006-1110.zip |
