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Title: Time-series analysis of surface deformation at Brady Hot Springs geothermal field (Nevada) using interferometric synthetic aperture radar

For this work, we analyze interferometric synthetic aperture radar (InSAR) data acquired between 2004 and 2014, by the ERS-2, Envisat, ALOS and TerraSAR-X/TanDEM-X satellite missions to measure and characterize time-dependent deformation at the Brady Hot Springs geothermal field in western Nevada due to extraction of fluids. The long axis of the ~4 km by ~1.5 km elliptical subsiding area coincides with the strike of the dominant normal fault system at Brady. Within this bowl of subsidence, the interference pattern shows several smaller features with length scales of the order of ~1 km. This signature occurs consistently in all of the well-correlated interferometric pairs spanning several months. Results from inverse modeling suggest that the deformation is a result of volumetric contraction in shallow units, no deeper than 600 m, likely associated with damaged regions where fault segments mechanically interact. Such damaged zones are expected to extend downward along steeply dipping fault planes, providing a high permeability conduit to the production wells. Using time series analysis, we test the hypothesis that geothermal production drives the observed deformation. We find a good correlation between the observed deformation rate and the rate of production in the shallow wells. We also explore mechanisms that couldmore » potentially cause the observed deformation, including thermal contraction of rock, decline in pore pressure and dissolution of minerals over time.« less
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1] ;  [4] ;  [1] ;  [5] ;  [2] ;  [1] ;  [2]
  1. Univ. of Wisconsin, Madison, WI (United States). Dept. of Geoscience
  2. Ormat Technologies Inc., Reno, NV (United States)
  3. Temple Univ., Philadelphia, PA (United States). Dept. of Earth and Environmental Science
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231; EE0005510; EE0006760; DGE-1256259
Type:
Published Article
Journal Name:
Geothermics
Additional Journal Information:
Journal Volume: 61; Journal Issue: C; Related Information: © 2016 The Authors.; Journal ID: ISSN 0375-6505
Publisher:
Elsevier
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; European Space Agency (ESA); National Aeronautic and Space Administration (NASA); German Space Agency (DLR); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 47 OTHER INSTRUMENTATION; InSAR deformation
OSTI Identifier:
1266399
Alternate Identifier(s):
OSTI ID: 1474937

Ali, S. T., Akerley, J., Baluyut, E. C., Cardiff, M., Davatzes, N. C., Feigl, K. L., Foxall, W., Fratta, D., Mellors, R. J., Spielman, P., Wang, H. F., and Zemach, E.. Time-series analysis of surface deformation at Brady Hot Springs geothermal field (Nevada) using interferometric synthetic aperture radar. United States: N. p., Web. doi:10.1016/j.geothermics.2016.01.008.
Ali, S. T., Akerley, J., Baluyut, E. C., Cardiff, M., Davatzes, N. C., Feigl, K. L., Foxall, W., Fratta, D., Mellors, R. J., Spielman, P., Wang, H. F., & Zemach, E.. Time-series analysis of surface deformation at Brady Hot Springs geothermal field (Nevada) using interferometric synthetic aperture radar. United States. doi:10.1016/j.geothermics.2016.01.008.
Ali, S. T., Akerley, J., Baluyut, E. C., Cardiff, M., Davatzes, N. C., Feigl, K. L., Foxall, W., Fratta, D., Mellors, R. J., Spielman, P., Wang, H. F., and Zemach, E.. 2016. "Time-series analysis of surface deformation at Brady Hot Springs geothermal field (Nevada) using interferometric synthetic aperture radar". United States. doi:10.1016/j.geothermics.2016.01.008.
@article{osti_1266399,
title = {Time-series analysis of surface deformation at Brady Hot Springs geothermal field (Nevada) using interferometric synthetic aperture radar},
author = {Ali, S. T. and Akerley, J. and Baluyut, E. C. and Cardiff, M. and Davatzes, N. C. and Feigl, K. L. and Foxall, W. and Fratta, D. and Mellors, R. J. and Spielman, P. and Wang, H. F. and Zemach, E.},
abstractNote = {For this work, we analyze interferometric synthetic aperture radar (InSAR) data acquired between 2004 and 2014, by the ERS-2, Envisat, ALOS and TerraSAR-X/TanDEM-X satellite missions to measure and characterize time-dependent deformation at the Brady Hot Springs geothermal field in western Nevada due to extraction of fluids. The long axis of the ~4 km by ~1.5 km elliptical subsiding area coincides with the strike of the dominant normal fault system at Brady. Within this bowl of subsidence, the interference pattern shows several smaller features with length scales of the order of ~1 km. This signature occurs consistently in all of the well-correlated interferometric pairs spanning several months. Results from inverse modeling suggest that the deformation is a result of volumetric contraction in shallow units, no deeper than 600 m, likely associated with damaged regions where fault segments mechanically interact. Such damaged zones are expected to extend downward along steeply dipping fault planes, providing a high permeability conduit to the production wells. Using time series analysis, we test the hypothesis that geothermal production drives the observed deformation. We find a good correlation between the observed deformation rate and the rate of production in the shallow wells. We also explore mechanisms that could potentially cause the observed deformation, including thermal contraction of rock, decline in pore pressure and dissolution of minerals over time.},
doi = {10.1016/j.geothermics.2016.01.008},
journal = {Geothermics},
number = C,
volume = 61,
place = {United States},
year = {2016},
month = {2}
}