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- ISSN: 2202-0586
- E-ISSN:
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oa Application of SAR Interferometry to A Geothermal Field
- Australian Society of Exploration Geophysicists
- Source: ASEG Extended Abstracts, Volume 2003, Issue ASEG2003 - 16th Geophysical Conference, Aug 2003, p. 1 - 4
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- 01 Aug 2003
Abstract
To measure the land deformation, we applied SAR interferometry to a geothermal field, where a geothermal plant has operated since 1995. Interferometric fringes were generated by the difference in radar phase acquired at different times by the JERS-1 SAR. We constructed interference patterns from the difference of two pairs of SAR images of '94/09/19-'95/04/27 and ‘95/04/27-’95/09/06.
The coherence of the ‘94/09/19-’95/04/27 pair is degraded probably by the spatial baseline noise. The interference patterns partly suffer from a spatial change of moisture. To evaluate the results, we compare the interferometric fringes of ‘95/04/27-’95/09/06 pair with the level changes during 1994 - 1995 observed by leveling.
The leveling shows a local subsidence of several centimeters. There is a good correlation in the comparison, however, the amplitude of the leveling during September 1994 - October 1995 is about two times greater than the slant range of interferometry.
I interpret that the ground has been subsiding constantly during September 1994 - October 1995 and that the interferometric fringes correspond to the land deformation in the order of cm during about a half period of the leveling observation.
© ASEG 2003