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Subduction tractions and vertical axis rotations in the Zagros-Makran transition zone, SE Iran: The 2013 May 11 Mw 6.1 Minab earthquake


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Authors

Oveisi, B 

Abstract

The source parameters and slip distribution of the 2013 May 11 Mw 6.1 Minab earthquake are studied using seismology, geodesy and field observations. We observe left-lateral strike-slip motion on a fault striking ENE–WSW; approximately perpendicular to previously studied faults in the Minab–Zendan–Palami fault zone. The fault that ruptured in 2013 is one of a series of ∼E–W striking left-lateral faults visible in the geology and geomorphology. These accommodate a velocity field equivalent to right-lateral shear on ∼N–S striking planes by clockwise rotations about vertical axes. The presence of these faults can reconcile differences in estimates of fault slip rates in the western Makran from GPS and Quaternary dating. The longitudinal range of shear in the western Makran is likely to be controlled by the distance over which the underthrusting Arabian lithosphere deepens in the transition from continent–continent collision in the Zagros to oceanic subduction in the Makran.

Description

Keywords

Earthquake source observations, Continental neotectonics, Asia

Journal Title

Geophysical Journal International

Conference Name

Journal ISSN

0956-540X
1365-246X

Volume Title

202

Publisher

Oxford University Press (OUP)
Sponsorship
Natural Environment Research Council (NE/J016322/1)
Natural Environment Research Council (NE/J019895/1)
Natural Environment Research Council (NE/K011014/1)
This work forms part of the NERC- and ESRC-funded project ’EarthquakesWithout Frontiers‘. CP is funded by a NERC PhD studentship.