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Synthetic aperture radar (SAR) data

Synthetic aperture radar (SAR) data. ALOS satellite of JAXA (Japan Aerospace Exploration Agency). distance between repeated orbits . … also, use ENVISAT (C-band) data from the same time period to resolve vertical/horizontal components of surface velocity

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Synthetic aperture radar (SAR) data

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  1. Synthetic aperture radar (SAR) data ALOS satellite of JAXA (Japan Aerospace Exploration Agency) distance between repeated orbits … also, use ENVISAT (C-band) data from the same time period to resolve vertical/horizontal components of surface velocity (C-band data suffer from decorrelation in the study area) • 5 ALOS ascending tracks • 10-30 radar interferograms in each track • Time span: 2007-2010 • Radar wavelength: 23.6 cm (L-band)

  2. Shallow fault creep inferred from InSAR • Creep rate of up to ~10 mm/yr • (~40% of relative plate motion) • Lateral extent: ~75 km • Consistent with Cakir et al. (2005): • C-band ERS data • 9 years (from 1992 to 2000) • and ENVISAT data (2003-2010, this study)

  3. Conclusions • The LOS velocities reveal discontinuities of up to ~6 mm/year across the Ismetpasa segment of the NAF, implying surface creep at a rate up to~10 mm/yr; this is a large fraction of the inferred fault slip rate (20-25 mm/yr) • The lateral extent of significant surfacecreep is about 75 km, broadly consistent withresults of previous studies • Neighboring fault sections do not exhibit shallow creep within the measurement accuracy (1-2 mm/yr) • The inferred depth extent of “shallow” fault creep at Ismetpasa is 6-7 km, suggesting that the deeper locked portion of the partially creeping segment is characterized by a higher stressing rate(smaller events? shorter recurrence interval?) • Dynamic models that incorporate rate-and-state friction combined with geodetic observations of interseismic deformation due to mature active faults can be used to infer in situ rate-state parameters of seismogenic crust

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