Heterogeneous surface displacement pattern at the Hatchobaru geothermal field inferred from SAR interferometry time-series |
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| Institution: | 1. Federal Institute for Geosciences and Natural Resources, Stilleweg 2, 30655 Hannover, Germany;2. Institute of Geophysics and Geoinformatics, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 12, 09596 Freiberg, Germany;3. Institute of Numerical Analysis and Optimisation, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 12, 09596 Freiberg, Germany;1. Department of Geology, Faculty of Earth and Environmental Science, University of Dhaka, Dhaka-1000, Bangladesh;2. Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan;1. Graduate school of Engineering, Department of Earth Resource Engineering, Kyushu University, Fukuoka,819-0395, Japan;2. Faculty of Engineering, Department of Earth Resource Engineering, Kyushu University, Fukuoka,819-0395, Japan;3. Institute for Geothermal Sciences, Graduate School of Science, Kyoto University, Beppu, 874-0903, Japan |
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| Abstract: | We estimated surface displacements using persistent scatterer SAR interferometry (PS-InSAR) around the Hatchobaru geothermal field, Japan, from 18 ALOS/PALSAR images acquired from July 2007 to December 2010. Generally, geothermal fields, covered with natural targets such as rocky terrain and vegetation, have been one of the difficult targets for PS-InSAR analysis. However, we applied space adaptive filtering to increase the number of pixels for measuring surface displacement. The results of our analysis demonstrate ground subsidence with decaying velocity over the observation period around the geothermal field. The spatial pattern of ground subsidence includes sharp boundaries of subsidence that can be interpreted as fault traces. We demonstrated the usefulness of PS-InSAR analysis with the space adaptive filtering to estimate surface displacements with high spatial resolution and high spatial density around a geothermal field. |
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| Keywords: | Surface displacement InSAR time-series analysis Space adaptive filtering Geothermal development Distributed scatterers |
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