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Houston-Galveston Bay Area, Texas, From Space—
A New Tool for Mapping Land Subsidence

By S.V. Stork and M. Sneed

Fact Sheet 110-02

In cooperation with the U.S. Fish and Wildlife Service


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Contents

Consequences of Land Subsidence

InSAR

InSAR-Detected Inland Subsidence, 1996

InSAR-Detected Coastal Subsidence, 1996–99

Integrated Monitoring in the 21st Century

Selected References

Figures

1. Map showing subsidence study area and extent of two satellite scenes, Houston-Galveston Bay area, Texas

2. Map showing extent of subsidence in the Houston-Galveston Bay area during 1906–95

3. Map and graphs showing that during 1978–95, subsidence in areas southeast of Houston essentially ceased as pumpage there decreased; and subsidence continued in areas northwest as pumpage there increased

4. Photograph showing land subsidence of 5 to 7 feet in a residential area in northern Houston exacerbated flooding in June 1989

5. Map showing areas of interferograms shown in figures 6–9

6. Wrapped and unwrapped interferograms for the western Houston area for the 11.5-month period January 13–December 29, 1996

7. Unwrapped interferogram for the Texas City area for the 31-month period August 27, 1996–March 29, 1999

8. Unwrapped interferogram for the Sagemeadow-Johnson Space Center area for the 31-month period August 27, 1996–March 29, 1999

9. Unwrapped interferogram for the Baytown area for the 31-month period August 27, 1996–March 29, 1999



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