The southern Zagros collisional orogen: new insights from transdimensional‐trees inversion of seismic noise

Pilia, S. and Jackson, J. A. and Hawkins, R. and Kaviani, A. and Ali, M. Y. (2020) The southern Zagros collisional orogen: new insights from transdimensional‐trees inversion of seismic noise. Geophysical Research Letters. ISSN 0094-8276 DOI https://doi.org/10.1029/2019GL086258

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Abstract

Imaging and resolving the lateral continuity of 3‐D crustal structures enhances our ability to interpret seismicity, and to understand how orogens are created. We apply a Bayesian, hierarchical inversion approach based on a transdimensional trees‐structured wavelet parameterisation to recover phase‐velocity maps at 2‐40 second periods. We then invert phase‐velocity dispersion to constrain a 3‐D shear‐velocity model of the crust beneath south‐central Iran. Together with accurate earthquake centroid depths and focal mechanisms, the pattern of 3‐D velocity variations supports recent suggestions that most large earthquakes in the Zagros occur within the lower sedimentary cover, or close to the sediment‐basement interface. Furthermore, we find evidence for Arabian basement underthrusting beneath central Iran, although only in one location does it appear to generate earthquakes. Our new 3‐D tomographic model clarifies and throws new light on the crustal structure of the SE Zagros and its relation to seismicity and active faulting.

Item Type:	Article
Uncontrolled Keywords:	2019AREP; IA76
Subjects:	02 - Geodynamics, Geophysics and Tectonics
Divisions:	02 - Geodynamics, Geophysics and Tectonics 08 - Green Open Access
Journal or Publication Title:	Geophysical Research Letters
Identification Number:	https://doi.org/10.1029/2019GL086258
Depositing User:	Sarah Humbert
Date Deposited:	10 Feb 2020 11:41
Last Modified:	29 Jul 2020 00:02
URI:	http://eprints.esc.cam.ac.uk/id/eprint/4622

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