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Coseismic deformation and 3-D surface displacement field of 2006 Fin earthquake, south of Iran, using InSAR

Mahasa Roustaei(1), Mohammadreza Abbassi(2), Manoucher Ghorashi(3) and Mehdi Fazeli(4)

(1) IIEES , No26,West Arghavan,North Dibaji,Farmanieh, Tehran, Iran
(2) IIEES, No26,West Arghavan,North Dibaji,Farmanieh, Tehran, Iran
(3) Geological Survey of Iran(GSI), Meraj Str,Azadi Sq, Tehran, Iran
(4) NICOEXP, Blind alley 1,Northeast of Sheikhbahaei Sq, Tehran, Iran

Abstract

Active deformation in Iran, structural province of Zagros, is a result of the convergence between the Arabian & Eurasian plates. This deformation is detected by seismic activities & faulting. The 2006 Fin earthquake (Mw ~6) in the Hormozgan province (south of Iran) provides a opportunity to map coseismic deformation in the Zagros Simply Folded Belt with space geodetic observation, Envisat Radar Interferometry. The reverse faulting in the Fin earthquake did not reach to the surface but descending and ascending track interferograms with different time spanning show ellipsoid pattern of surface deformation in the area. The limited seismic profiles suggest that the fault ruptured the upper layers of the crust but in the deepest parts is not clear that the fault affected the crystalline basement. One of the limitations of measuring deformation with InSAR is that an interferogram can only measure one component of deformation in the satellite's line of sight (LOS).We construct a 3 dimensional displacement field of deformation of the earthquake with usage of interferograms and azimuth offset from descending and ascending tracks.

Keywords: Active deformation, coseismic displacement, Zagros Simply Folded Belt, Radar interferometry, seismic profiles, and azimuth offset.

 

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry