Using Envisat InSAR time-series to investigate the surface kinematics of an active salt extrusion near Qum,Iran |
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| Affiliation: | 1. Department of Surveying and Geomatics Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran;2. GFZ German Research Centre for Geosciences, Department of Geodesy and Remote Sensing, Remote Sensing Section, 14473 Potsdam, Germany;3. Department of Mining Engineering, University of Tehran, Tehran, Iran;1. School of Earth Science and Engineering, Nanjing University, Nanjing 210046, Jiangsu, China;2. Earthquake Administration of Jiangsu Province, Nanjing 210014, Jiangsu, China;3. Department of Geosciences, Zhejiang University, Hangzhou 310027, Zhejiang, China;4. PetroChina Research Institute of Petroleum and Development, Beijing 100083, China |
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| Abstract: | Lower Oligocene-Miocene rock salt is exposed in several diapirs in the central plateau of Iran along the northern margin of the Great Kavir basin. These include a small but mature salt extrusion known as Qum Kuh located near the city of Qum. We use small-baseline interferograms to study the surface displacements of Qum Kuh. The interferometric dataset consisted of 149 interferometric displacement maps derived from 35 C-band ASAR images collected by Envisat satellite in both descending and ascending orbits from 2003 through 2009.The results of the displacement time series analyses show significant long-term trend of horizontal motion toward gentle slopes of Qum Kuh, punctuated by seasonal variations during dry and wet seasons. Interferometric Synthetic Aperture Radar (InSAR) time series results suggest that the salt near the spreading center, where the salt first surfaces from depth, is extruded to the more gentle flanks of Qum Kuh and that down-slope gravitational spreading of the extruded salt accelerates when it is wet. |
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| Keywords: | InSAR Qum Kuh Salt extrusion Small-baseline |
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