In seismically active regions, landscape evolution and Quaternary geology give rates of crustal deformation averaged over long time intervals: marine terraces and palaeoshorelines, fluvial terraces and river profiles yield uplift and fault throw rates and, through fault geometry, extension or shortening rates. Shorter intervals are covered by other records. Palaeoseismology, coastal geology and archaeoseismology span centuries to millennia and, like the geological rates, record permanent deformation on identified structures. GNSS and InSAR geodesy span years to decades and measure ongoing strain loading, part of which may never become permanent offset.

This session brings these timescales together and asks whether, where and why the resulting rates are comparable. Several explanations are possible and rarely tested against one another: the long-term rate may contain a regional component the fault did not produce; the geodetic rate may include elastic strain never released as permanent offset; deformation may be distributed across structures a fault-based model does not include; or the slip rate may genuinely have changed, because clustering, fault interaction and fault growth make rates non-steady over exactly the intervals being compared. Distinguishing between these explanations, rather than documenting the discrepancy, is what the session asks for.
We invite contributions that derive long-term deformation rates from landscape evolution and Quaternary geology, compare them with palaeoseismological and geodetic rates in the same region, and diagnose the reasons for agreement or disagreement.

Studies from all tectonic settings are welcome, from landscape evolution modelling to seismic hazard applications. Early career scientists are strongly encouraged to submit.