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 |
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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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