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1、 U.S. GEOLOGICAL SURVEY Water-Resources Investigations Report Detection and Measurement of Land Subsidence Using Global Positioning System and Interferometric Synthetic Aperture Radar, Coachella Valley, California,199698Prepared in cooperation with the COACHELLA VALLEY WATER DISTRICT014193ByMichelle
2、 Sneed1, Marti E. Ikehara2, D.L. Galloway3, andFalk Amelung4Sacramento, California 20011U.S. Geological Survey, Placer Hall, 6000 J Street, Sacramento, CA 95819-61292National Geodetic Survey, 1727 30th Street, MS35, Sacramento, CA 958163U.S. Geological Survey, 7801 Folsom Boulevard, Suite 325, Sacra
3、mento, CA 958264Hawaii Institute of Geophysics and Planetology, University of Hawaii, 2525 Correa Road, Honolulu, HI 96822 7417-13 U.S. DEPARTMENT OF THE INTERIOR GALE A. NORTON, SecretaryU.S. GEOLOGICAL SURVEY Charles G. Groat, Director For addtional information write to: Copies of this report can
4、be purchased from: U.S. Geological Survey Information Services Box 25286 Federal Center Denver, CO 80225The use of firm, trade, and brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey.District Chief U.S. Geological Survey W
5、ater Resources Division Placer Hall, Suite 2012 6000 J Street Sacramento, California 95819-6129 Contents IIICONTENTSAbstract. 1 Introduction . 2 Purpose and Scope. 4 Description of Study Area . 4 Acknowledgments . 6 Mechanics of Pumping-Induced Land Subsidence . 6 Global Positioning System (GPS) Sur
6、veys. 7 GPS Methods. 7 Land-Subsidence Monitoring Network . 7 Determination of Ellipsoid Heights. 7 1996 GPS Survey. 7 1998 GPS Survey. 11 GPS Results . 12 Ground-Water Levels and Aquifer-System Deformation . 12 Interferometric Synthetic Aperture Radar (InSAR). 16 InSAR Methods . 16 InSAR Results . 17 Future Monitoring. 24 Summary and Conclusions . 24 References Cited. 25FIGURES13. Maps showing: 1. Coachella Valley, California, and surrounding areas, and locations of four Continuously Operating Reference Stations . 3 2. Generalized geology
