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
KAUST DepartmentCrustal Deformation and InSAR Group
Earth Science and Engineering Program
Physical Science and Engineering (PSE) Division
Online Publication Date2018-07-03
Print Publication Date2018-08
Permanent link to this recordhttp://hdl.handle.net/10754/630136
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AbstractThe 23 October 2011 M 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.
CitationAkoğlu AM, Jónsson S, Wang T, Çakır Z, Dogan U, et al. (2018) 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. Bulletin of the Seismological Society of America 108: 1929–1946. Available: http://dx.doi.org/10.1785/0120170314.
SponsorsThe 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.
PublisherSeismological Society of America (SSA)