Interseismic deformation and creep along the central section of the North Anatolian Fault (Turkey): InSAR observations and implications for rate‐and‐state friction properties

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  • Y. Kaneko
    Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography Univerisity of California San Diego La Jolla California USA
  • Y. Fialko
    Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography Univerisity of California San Diego La Jolla California USA
  • D. T. Sandwell
    Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography Univerisity of California San Diego La Jolla California USA
  • X. Tong
    Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography Univerisity of California San Diego La Jolla California USA
  • M. Furuya
    Department of Natural History Sciences, Graduate School of Science Hokkaido University Kita‐ku Sapporo Japan

書誌事項

公開日
2013-01
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2012jb009661
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>We present high‐resolution measurements of interseismic deformation along the central section of the North Anatolian Fault (NAF) in Turkey using interferometric synthetic aperture radar data from the Advanced Land Observing Satellite and Envisat missions. We generated maps of satellite line‐of‐sight velocity using five ascending Advanced Land Observing Satellite tracks and one descending Envisat track covering the NAF between 31.2°E and 34.3°E. The line‐of‐sight velocity reveals discontinuities of up to ∼5 mm/yr across the Ismetpasa segment of the NAF, implying surface creep at a rate of ∼9 mm/yr; this is a large fraction of the inferred slip rate of the NAF (21–25 mm/yr). The lateral extent of significant surface creep is about 75 km. We model the inferred surface velocity and shallow fault creep using numerical simulations of spontaneous earthquake sequences that incorporate laboratory‐derived rate and state friction. Our results indicate that frictional behavior in the Ismetpasa segment is velocity strengthening at shallow depths and transitions to velocity weakening at a depth of 3–6 km. The inferred depth extent of shallow fault creep is 5.5–7 km, suggesting that the deeper locked portion of the partially creeping segment is characterized by a higher stressing rate, smaller events, and shorter recurrence interval. We also reproduce surface velocity in a locked segment of the NAF by fault models with velocity‐weakening conditions at shallow depth. Our results imply that frictional behavior in a shallow portion of major active faults with little or no shallow creep is mostly velocity weakening.</jats:p>

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