E. Hussain
Geodetic observations of postseismic creep in the decade after the 1999 Izmit earthquake, Turkey: Implications for a shallow slip deficit
Hussain, E.; Wright, T.J.; Walters, R.J.; Bekaert, D.; Hooper, A.; Houseman, G.A.
Authors
T.J. Wright
R.J. Walters
D. Bekaert
A. Hooper
G.A. Houseman
Abstract
The relationship between aseismic slip and tectonic loading is important for understanding both the pattern of strain accumulation along a fault and its ability to generate large earthquakes. We investigate the spatial distribution and temporal evolution of aseismic creep on the western North Anatolian Fault (NAF) using time series analysis of Envisat interferometric synthetic aperture radar (InSAR) data, covering the full extent of the 1999 Izmit and Düzce earthquake ruptures and spanning 2002–2010. Discontinuities in the line-of-sight velocity across the fault imply that fault creep reaches the Earth's surface at an average fault-parallel rate of ∼5 mm/yr along an ∼80 km section of the NAF. By combining InSAR and published GPS velocities, we are able to extract the vertical and east-west components of motion and show that the Adapazari basin is subsiding at a rate of ∼6 mm/yr. Vertical motions have biased previous estimates of creep in this region. The displacement time series close to the fault is consistent with an afterslip model based on rate-and-state friction, which predicts a rapid deceleration in fault creep rate after the Izmit earthquake to a near-steady state ∼5 mm/yr after 5 years. Projecting our model 200 years into the future we find that the cumulative displacement of 1–1.3 m is insufficient to account for the shallow coseismic slip deficit observed in previous studies. Distributed off-fault deformation in the shallow crust or transient episodes of faster slip are likely required to release some of the long-term strain during the earthquake cycle.
Citation
Hussain, E., Wright, T., Walters, R., Bekaert, D., Hooper, A., & Houseman, G. (2016). Geodetic observations of postseismic creep in the decade after the 1999 Izmit earthquake, Turkey: Implications for a shallow slip deficit. Journal of Geophysical Research. Solid Earth, 121(4), 2980-3001. https://doi.org/10.1002/2015jb012737
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 16, 2016 |
Online Publication Date | Apr 9, 2016 |
Publication Date | Apr 9, 2016 |
Deposit Date | Jul 19, 2016 |
Publicly Available Date | Jul 25, 2016 |
Journal | Journal of Geophysical Research. Solid Earth |
Print ISSN | 2169-9313 |
Electronic ISSN | 2169-9356 |
Publisher | American Geophysical Union |
Peer Reviewed | Peer Reviewed |
Volume | 121 |
Issue | 4 |
Pages | 2980-3001 |
DOI | https://doi.org/10.1002/2015jb012737 |
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Copyright Statement
© 2016. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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