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An up-to-date crustal deformation map of Iran using integrated campaign-mode and permanent GPS velocities
National Cartographic Center, Tehran, Iran.
Géosciences Montpellier, CNRS/University Montpellier, Montpellier, France.
IPGS/EOST CNRS/University Strasbourg, Strasbourg Cedex, France.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Computer and Geospatial Sciences, Geospatial Sciences. Lantmäteriet, Gävle, Sweden.ORCID iD: 0000-0003-1744-7004
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2019 (English)In: Geophysical Journal International, ISSN 0956-540X, E-ISSN 1365-246X, Vol. 217, no 2, p. 832-843Article in journal (Refereed) Published
Abstract [en]

We present the most extensive and up-to-date unified GPS velocity field for Iran. We processed the data collected during 10 years (2006–2015) from the Iranian Permanent GNSS Network (IPGN) and combined them with previously published velocity solutions from GPS survey measurements during 1997–2013. We analysed this velocity field using a continuum approach to compute a new strain rate map for this region and we designed a block model based on the main geological, morphological, and seismic structures. Comparison between both approaches suggests similar results and allow us to present the first comprehensive first order fault slip rate estimates for the whole of Iran. Our results confirm most of the results from previous geodetic studies. But we also show a trade-off between the coupling ratio of the Iranian Makran subduction interface and the kinematic of the faults north of the Makran in the Jazmurian depression. Indeed, although too scarce to accurately estimate a coupling ratio, we show that coupling higher than 0.4 on the plate interface down to a depth of 25 km will induce extension on the E-W faults in the Jazmurian region. However, the sites close to the shoreline suggest a low coupling ratio, hence the coupling on this plate interface is probably more complicated than previously described and the Iranian Makran subduction interface mechanical behaviour might be similar to that on the Hellenic subduction zone.

Place, publisher, year, edition, pages
Oxford University Press, 2019. Vol. 217, no 2, p. 832-843
Keywords [en]
GPS, Iran, Strain, deformation, Zagros, Makran
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:hig:diva-29221DOI: 10.1093/gji/ggz045Scopus ID: 2-s2.0-85063728224OAI: oai:DiVA.org:hig-29221DiVA, id: diva2:1285169
Available from: 2019-02-02 Created: 2019-02-02 Last updated: 2019-08-15Bibliographically approved

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Nilfouroushan, Faramarz

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