Evidence for tear faulting from new constraints of the 23 october 2011 Mw 7.1 Van, Turkey, earthquake based on InSAR, GPS, coastal uplift, and field observations

Ahmet M. Akoğlu; Sigurjón Jónsson; Teng Wang; Ziyadin Çakır; Ugur Dogan; Semih Ergintav; Batuhan Osmanoğlu; Guangcai Feng; Cengiz Zabcı; Alpay Özdemir; Ömer Emre

doi:10.1785/0120170314

Evidence for tear faulting from new constraints of the 23 october 2011 M_w 7.1 Van, Turkey, earthquake based on InSAR, GPS, coastal uplift, and field observations

Ahmet M. Akoğlu, Sigurjón Jónsson, Teng Wang, Ziyadin Çakır, Ugur Dogan, Semih Ergintav, Batuhan Osmanoğlu, Guangcai Feng, Cengiz Zabcı, Alpay Özdemir, Ömer Emre

Department of Geological Engineering

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

The 23 October 2011 M_w 7.1 Van earthquake in eastern Turkey took place on a previously unknown thrust fault, causing over 600 fatalities and extensive damage mainly in Van city and the northern town of Erciş. Several coseismic models have already been published after the earthquake using the available seismological and geodetic data. These studies generally agree on a coseismic rupture on a north-dipping east–west-trending blind-thrust fault comprising one or two subparallel segments and the existence of a shallow slip deficit. Here, by introducing an additional coseismic pixel-offset dataset from the TerraSAR-X satellite, we conclude that a NNE–SSW-trending left-lateral tear fault that bounds the rupture to the east also slipped both during and after the mainshock, which is in agreement with both field observations and postseismic Global Positioning System (GPS) measurements. This has important implications for the seismic hazard analysis of the region as the extent and geometry of the rupture that we infer differ significantly from those previously proposed.

Original language	English
Pages (from-to)	1929-1946
Number of pages	18
Journal	Bulletin of the Seismological Society of America
Volume	108
Issue number	4
DOIs	https://doi.org/10.1785/0120170314
Publication status	Published - Aug 2018

Bibliographical note

Publisher Copyright:
© 2018, Seismological Society of America. All rights reserved.

Funding

The authors thank Martin Mai (King Abdullah University of Science and Technology [KAUST]), Yann Klinger (Institut de Physique du Globe de Paris [IPG Paris]), Robert Reilinger (Massachusetts Institute of Technology [MIT]), Mustapha Meghraoui (Ecole et Observatoire des Sciences de la Terre [EOST], University of Strasbourg), Hannes Vasyura-Bathke (KAUST), Serdar Kalkavan (Devlet Su İşleri-General Directorate of State Hydraulic Works [DSİ] Ankara), and many others for sharing their insights. The authors also thank ‏D‏iego Me‏l‏gar and an anonym‏o‏us review‏e‏r for their‏ ‏constructiv‏e‏ comments on the article. A high-resolution digital elevation model (DEM) of the epicentral area is gener‏o‏usly provided by Korhan Erturaç (Sakarya Un‏i‏versity [SAÜ]‏)‏. The research reported in this publication was supported by KAUST. The authors thank Martin Mai (King Abdullah University of Science and Technology [KAUST]), Yann Klinger (Institut de Physique du Globe de Paris [IPG Paris]), Robert Reilinger (Massachusetts Institute of Technology [MIT]), Mustapha Meghraoui (Ecole et Observatoire des Sciences de la Terre [EOST], University of Strasbourg), Hannes Vasyura-Bathke (KAUST), Serdar Kalkavan (Devlet Su İşleri-General Directorate of State Hydraulic Works [DSİ] Ankara), and many others for sharing their insights. The authors also thank Diego Melgar and an anonymous reviewer for their constructive comments on the article. A high-resolution digital elevation model (DEM) of the epicentral area is generously provided by Korhan Er-turaç (Sakarya University [SAÜ]). The research reported in this publication was supported by KAUST.

Funders	Funder number
Massachusetts Institute of Technology
King Abdullah University of Science and Technology

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Cite this

Akoğlu, A. M., Jónsson, S., Wang, T., Çakır, Z., Dogan, U., Ergintav, S., Osmanoğlu, B., Feng, G., Zabcı, C., Özdemir, A., & Emre, Ö. (2018). Evidence for tear faulting from new constraints of the 23 october 2011 M_w 7.1 Van, Turkey, earthquake based on InSAR, GPS, coastal uplift, and field observations. Bulletin of the Seismological Society of America, 108(4), 1929-1946. https://doi.org/10.1785/0120170314

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title = "Evidence for tear faulting from new constraints of the 23 october 2011 Mw 7.1 Van, Turkey, earthquake based on InSAR, GPS, coastal uplift, and field observations",

abstract = "The 23 October 2011 Mw 7.1 Van earthquake in eastern Turkey took place on a previously unknown thrust fault, causing over 600 fatalities and extensive damage mainly in Van city and the northern town of Erci{\c s}. Several coseismic models have already been published after the earthquake using the available seismological and geodetic data. These studies generally agree on a coseismic rupture on a north-dipping east–west-trending blind-thrust fault comprising one or two subparallel segments and the existence of a shallow slip deficit. Here, by introducing an additional coseismic pixel-offset dataset from the TerraSAR-X satellite, we conclude that a NNE–SSW-trending left-lateral tear fault that bounds the rupture to the east also slipped both during and after the mainshock, which is in agreement with both field observations and postseismic Global Positioning System (GPS) measurements. This has important implications for the seismic hazard analysis of the region as the extent and geometry of the rupture that we infer differ significantly from those previously proposed.",

author = "Akoğlu, {Ahmet M.} and Sigurj{\'o}n J{\'o}nsson and Teng Wang and Ziyadin {\c C}akır and Ugur Dogan and Semih Ergintav and Batuhan Osmanoğlu and Guangcai Feng and Cengiz Zabcı and Alpay {\"O}zdemir and {\"O}mer Emre",

year = "2018",

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Akoğlu, AM, Jónsson, S, Wang, T, Çakır, Z, Dogan, U, Ergintav, S, Osmanoğlu, B, Feng, G, Zabcı, C, Özdemir, A & Emre, Ö 2018, 'Evidence for tear faulting from new constraints of the 23 october 2011 M_w 7.1 Van, Turkey, earthquake based on InSAR, GPS, coastal uplift, and field observations', Bulletin of the Seismological Society of America, vol. 108, no. 4, pp. 1929-1946. https://doi.org/10.1785/0120170314

Evidence for tear faulting from new constraints of the 23 october 2011 M_w 7.1 Van, Turkey, earthquake based on InSAR, GPS, coastal uplift, and field observations. / Akoğlu, Ahmet M.; Jónsson, Sigurjón; Wang, Teng et al.
In: Bulletin of the Seismological Society of America, Vol. 108, No. 4, 08.2018, p. 1929-1946.

Research output: Contribution to journal › Article › peer-review

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AU - Ergintav, Semih

AU - Osmanoğlu, Batuhan

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