PUBLICATIONS Journal of Geophysical Research: Earth Surface RESEARCH ARTICLE Geomorphic constraints on fault throw rates and 10.1002/2014JF003318 linkage times: Examples from the Northern Key Points: Gulf of Evia, Greece • Footwall relief reflects fault segmentation for the studied Alexander C. Whittaker1 and A. Sofia Walker1 faults <60 km long • Knickpoints are generated by fault 1Department of Earth Science and Engineering, Royal School of Mines, Imperial College, London, UK linkage and their heights scale with footwall relief • Fault throw rates calculated from knickpoint heights and footwall relief Abstract We evaluate how the growth and interaction of active normal faults in the Sperchios Basin and Northern Gulf of Evia, Greece, are recorded by the landscape. We demonstrate that patterns in footwall relief along the faults reflect fault segmentation, and we show that in this study area, fault throw is 2 to 3 times the maximum footwall relief. Rivers crossing the faults typically have two knickpoints, which are unrelated to Correspondence to: A. C. Whittaker, lithology. However, their heights, measured from the active fault trace, vary systematically. The height of the
[email protected] upper set of knickpoints scales linearly with the footwall relief of the faults and is typically >85% of the maximum relief. The height of the lower set of knickpoints also scales with footwall relief, but the heights Citation: are consistently lower. The existence of two sets of knickpoints suggests that the rivers have been perturbed Whittaker, A. C., and A. S. Walker (2015), by two changes in tectonic rates during faulting. We interpret the upper knickpoints to represent the Geomorphic constraints on fault throw initiation and growth of fault-generated topography, while the lower set of knickpoints reflects a throw rate rates and linkage times: Examples from the Northern Gulf of Evia, Greece, increase due to fault linkage.