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Active deformation within the Zagros Mountains deduced from GPS measurements
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
2006 (English)In: Journal of the Geological Society, ISSN 0016-7649, E-ISSN 2041-479X, Journal of the Geological Society, London, Vol. 163, no 1, 143-148 p.Article in journal (Refereed) Published
Abstract [en]

We present and interpret the results of Global Positioning System (GPS) measurements at 35 stations in and beside the Zagros Mountain belt, SW Iran, for three campaigns ending March 1998, December 1999 and June 2001. Preliminary motion estimates show clearly the change in character along the strike of the belt. Stations to the SE move at 13–22 ± 3 mm a–1 towards N 7 ± 5°E with respect to Eurasia. Most of the shortening indicated by the GPS velocities seems to occur in the SE Zagros along two major seismic zones and along the Zagros front. To the NW, stations move oblique to the trend of the belt towards N 12 ± 8°W, at 14–19 ± 3 mm a–1. Most of the shortening in the NW Zagros seems to occur along the Mountain Front Fault with its major earthquakes as well as along the Zagros front. The change in direction and magnitude of the velocity vectors across the north–south-trending Kazerun and Karebas faults involves extension of up to 4 mm a–1 along the strike of the Zagros belt.

Place, publisher, year, edition, pages
2006. Vol. 163, no 1, 143-148 p.
National Category
Geology
Identifiers
URN: urn:nbn:se:uu:diva-96013DOI: 10.1144/​0016-764905-031OAI: oai:DiVA.org:uu-96013DiVA: diva2:170418
Available from: 2007-05-07 Created: 2007-05-07 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Ground Movements in the Zagros Fold-Thrust Belt of SW Iran Measured by GPS and InSAR Compared to Physical Models
Open this publication in new window or tab >>Ground Movements in the Zagros Fold-Thrust Belt of SW Iran Measured by GPS and InSAR Compared to Physical Models
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis uses geodetic satellite data to measure present-day crustal deformation in the Zagros fold-thrust belt (SW Iran). Geodetic-type measurements are also used in down-scaled models that simulate the surface deformations seen in convergent settings like the Zagros fold-thrust belt.

Global Positioning System (GPS) measurements of three surveys between 1998 and 2001 indicate 9 ± 3 mm/yr and 5 ± 3 mm/yr shortening across the SE and NW Zagros respectively. GPS results show that in addition to the different rates and directions of shortening on either side of the NS trending Kazerun fault, local along-belt extension occurs to the east.

Differential SAR interferograms of ERS1 & 2 images between 1992 and 1999 detect 8 ± 4 mm/yr uplift rate across a newly recognized fault in SW Qeshm Island. This can be attributed to a steep imbricate thrust that may still represent the local Zagros deformation front.

The salt diapirs in the Zagros rise from a source layer that acts as a low-frictional decollement that decouples the deformation of the cover sediments from their basement in the eastern Zagros whereas the cover to the west deforms above a high-friction decollement. Physical models were prepared to simulate cover deformation in the Zagros by shortening a sand pack above adjacent high- and low-frictional decollements (represented by a ductile layer). The strain distributions differed above the two types of decollements; it was more heterogeneous above the salt where local extension in the shortening direction was dominant. A separate work also investigated systematically the role of basal friction on cover deformation in convergent settings. Accurate height measurements of the model surface by laser-scanner indicated a deformation front more distal than usual, particularly in the low-basal frictional models. The volume reduction in our shortened sand models correlated directly with their basal friction.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2007. 38 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 318
Keyword
Earth sciences, Zagros fold-thrust belt, deformation, GPS, InSAR, Physical modeling, tectonics, convergent settings, basal friction, Geovetenskap
Identifiers
urn:nbn:se:uu:diva-7928 (URN)978-91-554-6918-4 (ISBN)
Public defence
2007-06-01, Axel Hansrambergsalen, Geocentrum, Villavägen 16, SE75236, Uppsala, 10:00
Opponent
Supervisors
Available from: 2007-05-07 Created: 2007-05-07Bibliographically approved

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Nilforoushan, FaramarzTalbot, Christopher J.

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