Continuous monitoring of surface deformation at Long Valley Caldera, California, with GPS
| Autor: | Timothy H. Dixon, John Langbein, Ailin Mao, Frank Webb, Marcus Bursik, Michael Heflin, Ross S. Stein |
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| Rok vydání: | 1997 |
| Předmět: |
Atmospheric Science
Soil Science Magma chamber Aquatic Science Oceanography Dome (geology) Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) Caldera Earth-Surface Processes Water Science and Technology geography geography.geographical_feature_category Ecology business.industry Resurgent dome Paleontology Geodetic datum Forestry Geodesy Geophysics Volcano Domo Space and Planetary Science Global Positioning System business Geology |
| Zdroj: | Journal of Geophysical Research: Solid Earth. 102:12017-12034 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/96jb03902 |
| Popis: | Continuous Global Positioning System (GPS) measurements at Long Valley Caldera, an active volcanic region in east central California, have been made on the south side of the resurgent dome since early 1993. A site on the north side of the dome was added in late 1994. Special adaptations for autonomous operation in remote regions and enhanced vertical precision were made. The data record ongoing volcanic deformation consistent with uplift and expansion of the surface above a shallow magma chamber. Measurement precisions (1 standard error) for “absolute” position coordinates, i.e., relative to a global reference frame, are 3–4 mm (north), 5–6 mm (east), and 10–12 mm (vertical) using 24 hour solutions. Corresponding velocity uncertainties for a 12 month period are about 2 mm/yr in the horizontal components and 3–4 mm/yr in the vertical component. High precision can also be achieved for relative position coordinates on short ( |
| Databáze: | OpenAIRE |
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