HR: 08:30h
AN: H31L-03 [Abstracts]
TI: An InSAR-based survey of surface subsidence hazard in Iran
AU: * Motagh, M
EM: motagh@gfz-potsdam.de
AF: GeoForschungsZentrum (GFZ), Telegrafenerg Haus E,
Department of Earthquake Risk and Early Warning (Sektion 2.1), Potsdam, 14473, Germany
AU: Walter, T
EM: twalter@gfz-potsdam.de
AF: GeoForschungsZentrum (GFZ), Telegrafenerg Haus E,
Department of Earthquake Risk and Early Warning (Sektion 2.1), Potsdam, 14473, Germany
AU: Sharifi, M
EM: sharifi@ut.ac.ir
AF: University of Tehran, Department of Geomatics and Surveying Engineering, Faculty of
Engineering, Tehran, 11155-4563, Iran (Islamic Republic of)
AU: Schenk, A
EM: andreas.schenk@uni-wuerzburg.de
AF: Wuerzburg University, Institute for Geography,
Am Hubland, Wuerzburg, 97074, Germany
AU: Anderssohn, J
EM: calypso@gfz-potsdam.de
AF: GeoForschungsZentrum (GFZ), Telegrafenerg Haus A,
Institute for Remote Sensing (Sektion 1.4), Potsdam, 14473, Germany
AU: Zschau, J
EM: zschau@gfz-potsdam.de
AF: GeoForschungsZentrum (GFZ), Telegrafenerg Haus E,
Department of Earthquake Risk and Early Warning (Sektion 2.1), Potsdam, 14473, Germany
AB:
Land-surface subsidence due to over-extraction of groundwater has been long recognized as a potential problem
in many areas that have undergone extensive groundwater development. In Iran, decades of unrestrained
groundwater extraction for domestic, agricultural, and industrial use have resulted in a precipitous depletion of
this valuable resource. Here we use satellite radar interferometry (InSAR) and show that the decline in
groundwater levels is associated with land-surface deformation on local and regional scales. We have utilized
Envisat ASAR data and created interferograms imaging 13 plain aquifers and valleys in Iran. We infer 6 major
sources of groundwater-induced deformation showing up to 10 – 50 cm/yr of subsidence. Temporal analysis of
InSAR data show no evidence of major seasonal rebound due to seasonally fluctuating groundwater levels,
possibly implying that inelastic compaction is the dominant deformation process at water reservoirs.
DE: 0468 Natural hazards
DE: 0742 Avalanches
DE: 1817 Extreme events
DE: 1821 Floods
DE: 1855 Remote sensing (1640)
SC: Hydrology [H]
MN: 2007 Fall Meeting