| Abstract: | A subsidence research program began in 1985 to document the extent and magnitude of land subsidence in Sacramento Valley, California, an area of about 15 600 km2m, using Global Positioning System (GPS) surveying. In addition to periodic conventional spirit levelling, an examination was made of the changes in GPS-derived ellipsoidal height differences (summary differences) between pairs of adjacent bench marks in central Sacramento Valley from 1986 to 1989. The average rates of land subsidence in the southern Sacramento Valley for the past several decades were determined by comparing GPS-derived orthometric heights with historic published elevations. A maximum average rate of 0.053 m year-1 (0.90 m in 17 years) of subsidence has been measured. -Author |
| Genre: | Article |
| ProdID: | 70017543 |
| Citation Author: | Ikehara, M. E. |
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| Citation End Page: | 429 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Hydrological Sciences Journal/Journal des Sciences Hydrologiques |
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| Citation Number Of Pages: | 13 |
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| Citation Search Results Text: | Global positioning system surveying to monitor land subsidence in Sacramento Valley, California, USA; 1994; Article; Journal; Hydrological Sciences Journal/Journal des Sciences Hydrologiques; Ikehara, M. E. |
| Citation Start Page: | 417 |
| Citation Volume: | 39 |
| Citation Year: | 1994 |
| Type: | citation/reference |
| Text: | Global positioning system surveying to monitor land subsidence in Sacramento Valley, California, USA; 1994; Article; Journal; Hydrological Sciences Journal/Journal des Sciences Hydrologiques; Ikehara, M. E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
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