Contemporary Plate Kinematics and Crustal Deformation in Iran Constrained by Geodetic Measurements

HR: 08:00h
AN: G31D-01 INVITED [Abstracts]
TI: Contemporary Plate Kinematics and Crustal Deformation in Iran Constrained by Geodetic Measurements
AU: * Vernant, P
EM: vernant@mit.edu
AF: Dept. Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology 77 Massachusetts avenue, Cambridge, MA 02139 United States
AU: Masson, F
EM: fmasson@dstu.univ-montp2.fr
AF: Lab. Dynamique de la Lithosphere, Universite Montpellier 2 pl. E. Bataillon, Montpellier, 34095 France
AU: Chery, J
EM: jean.chery@dstu.univ-montp2.fr
AF: Lab. Dynamique de la Lithosphere, Universite Montpellier 2 pl. E. Bataillon, Montpellier, 34095 France
AU: Bayer, R
EM: roger.bayer@dstu.univ-montp2.fr
AF: Lab. Dynamique de la Lithosphere, Universite Montpellier 2 pl. E. Bataillon, Montpellier, 34095 France
AU: Doerflinger, E
EM: erik@dstu.univ-montp2.fr
AF: Lab. Dynamique de la Lithosphere, Universite Montpellier 2 pl. E. Bataillon, Montpellier, 34095 France
AU: Peyret, M
EM: michel.peyret@dstu.univ-montp2.fr
AF: Lab. Dynamique de la Lithosphere, Universite Montpellier 2 pl. E. Bataillon, Montpellier, 34095 France
AU: Walpersdorf, A
EM: Andrea.Walpersdorf@obs.ujf-grenoble.fr
AF: Laboratoire de Geophysique Interne et Tectonophysique, Universite Joseph Fourrier, Grenoble, 38041 France
AU: Hatzfeld, D
EM: Denis.Hatzfeld@obs.ujf-grenoble.fr
AF: Laboratoire de Geophysique Interne et Tectonophysique, Universite Joseph Fourrier, Grenoble, 38041 France
AU: Martinod, J
EM: martinod@lmtg.obs-mip.fr
AF: Lab. des Mecanismes et Transferts en Geologie, Universit‚ Paul-Sabatier, Toulouse, 31400 France
AU: Vigny, C
EM: vigny@geologie.ens.fr
AF: Lab. de Geologie, Ecole Normale Sup‚rieure 24 rue Lhomond, Paris, 75231 France
AU: Tavakoli, F
EM: F-tavakol@ncc.neda.net.ir
AF: Geodynamic Department, National Cartographic Center Meraj Ave., Tehran, 13185-1684 Iran (Islamic Republic of)
AU: Djamour, Y
EM: djamour@dstu.univ-montp2.fr
AF: Lab. Dynamique de la Lithosphere, Universite Montpellier 2 pl. E. Bataillon, Montpellier, 34095 France
AU: Djamour, Y
EM: djamour@dstu.univ-montp2.fr
AF: Geodynamic Department, National Cartographic Center Meraj Ave., Tehran, 13185-1684 Iran (Islamic Republic of)
AU: Nankali, H
EM: hnankali@ncc.neda.net.ir
AF: Geodynamic Department, National Cartographic Center Meraj Ave., Tehran, 13185-1684 Iran (Islamic Republic of)
AU: Nilforoushan, F
EM: faramarz.nilforoushan@geo.uu.se
AF: Geodynamic Department, National Cartographic Center Meraj Ave., Tehran, 13185-1684 Iran (Islamic Republic of)
AU: Maddad, M
EM: m-77@ncc.neda.net.ir
AF: Geodynamic Department, National Cartographic Center Meraj Ave., Tehran, 13185-1684 Iran (Islamic Republic of)
AU: Abbasi, M
EM: mammad@iiees.ac.ir
AF: International Institute of Earthquake Engineering and Seismology, Farmanieh, Dibaji, Arghavan St., Tehran, 19531 Iran (Islamic Republic of)
AU: Tatar, M
EM: mtatar@iiees.ac.ir
AF: International Institute of Earthquake Engineering and Seismology, Farmanieh, Dibaji, Arghavan St., Tehran, 19531 Iran (Islamic Republic of)
AU: Ashtiani, A
EM: ashtiani@iiees.ac.ir
AF: International Institute of Earthquake Engineering and Seismology, Farmanieh, Dibaji, Arghavan St., Tehran, 19531 Iran (Islamic Republic of)
AB: Several GPS networks have been installed in Iran and Northern Oman to measure the active tectonic deformation of this part of the Alpine-Himalayan mountain belt. These studies confirm the rigidity of the Northern part of the Arabian plate and a northward motion relative to Eurasia slower than the NUVEL-1A estimates. This northward shortening is accommodated differently in the western and eastern part of Iran. West of 58$\deg$E, the deformation is distributed in several orogens (Zagros, Talesh, Alborz and Caucasus) surrounding rigid blocks (Central Iranian block and South Caspian block). The CIB/Sanadaj-Sirjan zone is characterized by a very low internal deformation. The relative motion of the Arabia relative to the CIB allows to define long term N-S shortening of the Zagros. At the longitude of Tehran, the Zagros and the Alborz mountain ranges accommodate 6.5 $\pm$ 2 mm/yr and 5 $\pm$ 2 mm/yr respectively. $\sim$3 mm/yr seems to be accommodated somewhere in the Dasht-e-Kavir (i.e., between the CIB and the Alborz Range). The right lateral displacement along the Main Recent Fault in the NW Zagros is about 3 $\pm$ 2 mm/yr, smaller than what was generally expected. By contrast, large right lateral displacement takes place in the NW Iran on the Tabriz fault. The motion of the SCB cannot be precisely inferred by the GPS measurement but it seems that the direction is roughly NW with a rate lesser than $\sim$6 mm/yr. East of 58$\deg$E, most of the deformation is accommodated by the Makran subduction at a rate of 19.5 $\pm$ 2 mm/yr and the remaining deformation is accommodated north of the Lut block in the Kopet-Dag. The differential between eastern and western Iran is accommodated by strike slip motions along Minab fault zone and the NS faults bordering the Lut block.
DE: 7230 Seismicity and seismotectonics
DE: 8102 Continental contractional orogenic belts
DE: 8107 Continental neotectonics
DE: 1206 Crustal movements--interplate (8155)
DE: 1243 Space geodetic surveys
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting