Title

Mexico City Subsidence Observed with Persistent Scatterer InSAR

Document Type

Article

Publication Date

2-2011

Keywords

subsidence, interferometry, GPS, Mexico City, synthetic aperture radar (SAR) interferometry, persistent scatterer interferometry (PSI)

Digital Object Identifier (DOI)

http://dx.doi.org/10.1016/j.jag.2010.05.009

Abstract

We analyzed 23 satellite SAR (synthetic aperture radar) scenes using Persistent Scatter Interferometry (PSI) to study subsidence in Mexico City associated with groundwater withdrawal. The data were acquired by the Envisat ASAR system between January 2004 and July 2006. The spatial pattern of subsidence and the maximum subsidence rate (300 mm/year) are similar to earlier studies. Comparison to independent GPS data indicates RMS agreement between the two techniques of 6.9 mm/year, about the level expected based on joint data uncertainty. Significant annual variation in the GPS vertical data is not observed, suggesting minimal aquifer recharge during the rainy season, and justifying a simple linear model of phase variation through time for the PSI analysis.

Was this content written or created while at USF?

No

Citation / Publisher Attribution

International Journal of Applied Earth Observation and Geoinformation, v. 13, issue 1, p. 1-12

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