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

Kaneko, Y.; Fialko, Y.; Sandwell, D. T.; Tong, X.; Furuya, M.

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

Kaneko, Y.; Fialko, Y.; Sandwell, D. T. et al.

Journal of Geophysical Research - Solid Earth, 2013, 118(1), 316-331

Permalink : https://hdl.handle.net/2115/52978

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アクセス権	open access
URI	https://hdl.handle.net/2115/52978
タイトル	Interseismic deformation and creep along the central section of the North Anatolian Fault (Turkey) : InSAR observations and implications for rate-and-state friction properties
著者	Kaneko, Y. ; Fialko, Y. ; Sandwell, D. T. ; Tong, X. ; Furuya, M.
著者名 Kaneko, Y.
著者名 Fialko, Y.
著者名 Sandwell, D. T.
著者名 Tong, X.
e-Rad_Researcher 60313045 著者名 Furuya, M.
言語	英語
発行日	2013-01
出版者	American Geophysical Union
収録物名	Journal of Geophysical Research - Solid Earth
巻(号)	118(1)
ページ	316-331
抄録	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 degrees E and 34.3 degrees E. The line-of-sight velocity reveals discontinuities of up to similar to 5 mm/yr across the Ismetpasa segment of the NAF, implying surface creep at a rate of similar to 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. Citation: Kaneko, Y., Y. Fialko, D. T. Sandwell, X. Tong, and M. Furuya (2013), Interseismic deformation and creep along the central section of the North Anatolian Fault (Turkey): InSAR observations and implications for rate-and-state friction properties, J. Geophys. Res. Solid Earth, 118, 316-331, doi: 10.1029/2012JB009661.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Copyright 2013 American Geophysical Union.
PISSN	0148-0227
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1029/2012JB009661