The 4th February 1997 Bojnurd (Garmkhan) earthquake in NE Iran: field, teleseismic and strong-motion evidence for rupture directivity effects on a strike-slip fault

Hollingsworth, J. and Jackson, J. A. and Alarcón, J. E. and Bommer, J. J. and Bolourchi, M. J. (2007) The 4th February 1997 Bojnurd (Garmkhan) earthquake in NE Iran: field, teleseismic and strong-motion evidence for rupture directivity effects on a strike-slip fault. Journal of Earthquake Engineering, 11 (2). pp. 193-214. ISSN 1559-808X (electronic) 1363-2469 (paper) DOI https://doi.org/10.1080/13632460601031078

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Abstract

The Bojnurd region of NE Iran experienced a Mw 6.4 earthquake on February 4, 1997. By combining results from teleseismic body-waveform analysis, field observations of structural damage, coseismic deformation, geomorphology, and analysis of the resulting strong ground-motions, we build a coherent picture of the faulting associated with this earthquake. The earthquake resulted from almost pure right-lateral strike-slip motion (0.5–1.0 m), which ruptured a ∼15 km long section of fault, striking ∼340° at its northern end, which changes to ∼320° at its southern end. This fault can be seen clearly on the geological map and satellite imagery. The village of Sheikh lies ∼10–15 km SE of the fault rupture, yet was severely damaged during the earthquake. Analysis of strong-motion records, recorded by the Building and Hazard Research Center of Iran, particularly their significant duration, the polarization of the fault-normal component, and the velocity pulse, indicates a probable directivity effect, in which the rupture propagated from north to south, towards the village of Sheikh.

Item Type:	Article
Uncontrolled Keywords:	2007 AREP IA51 IA54 2007 P
Subjects:	02 - Geodynamics, Geophysics and Tectonics
Divisions:	02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title:	Journal of Earthquake Engineering
Volume:	11
Page Range:	pp. 193-214
Identification Number:	https://doi.org/10.1080/13632460601031078
Depositing User:	Sarah Humbert
Date Deposited:	16 Feb 2009 13:02
Last Modified:	23 Jul 2013 10:07
URI:	http://eprints.esc.cam.ac.uk/id/eprint/390

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