2q2q Hochstetter Lecture Phaedra Upton GNS Science 7 pm E8th August3 Auckland Museum Auditorium How tectonic and surface processes interact to shape the landscape The central South Island has long been a favourite si te to study and model oblique continental collisionH because the orogen is youngH narrowH and a single structureH the Alpine FaultH takes up >703 of relative plate motion. The orogen is highly asymmetric and varies along strike as the nature of the two colliding plates change along the boundary. I will explore the 3D structure and kinematics of the orogenH and discuss how regional deep-seated tectonic processes of mountain building are geodynamically interconnected with climateH landscapeH and near -surface geological processes that create local fluid flowH effective stressH and temperature anomalies. Complementary Hochstetter Lecture The Southern Alps of New Zealand B an integrated picture of an evolving plate boundary The landscape serves as a link between the solid Earth and the atmos phere. At many spatial and temporal scalesH landscape morphology and topography provide a constraint on the tectonics of the Earth and processes active within it. To unravel theseH we need to understand the complex relationships between surface processesHtheir drivers and the rocks upon which they act. I will explore recent developments in modelling tectonics and surface processes within a single deformational framework. I will focus on collisional settings such as New Zealand’s Southern AlpsH SE Alaska and the Himalaya where rapid uplift combines with vigorous climate regimes to create dynamic landscapes. E pm E7th August University of Auckland Rm 3q3BBq5 Phaedra Upton is the Geodynamics Team Leader at GNS Science5 She has widely published on oblique collisional plate boundaries including the Southern Alps5 More recently3 tectonic geomorphology has become her main focus5 As a modeller3 Phaedra tries to bring practical and sensible numerical modelling approaches to a wide range of Earth Science topics3 from large scale processes in the deep crust through to surface processes of active erosion and sedimentation5

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77 7 7The7central7South7Island7has7long7been7a7favourite7site7to7study7and7model7oblique7continental7collisionH7because7the7orogen7is7youngH7narrowH7and7a7single7structureH7the7Alpine7FaultH7takes7up7>7037of7relative7plate7motion.7The7orogen7is7highly7asymmetric7and7varies7along7strike7as7the7nature7of7the7two7colliding7plates7change7along7the7boundary.7I7will7explore7the73D7structure7and7kinematics7of7the7orogenH7and7discuss7how7regional7deep-seated7tectonic7processes7of7mountain7building7are7geodynamically7interconnected7with7climateH7landscapeH7and7near-surface7geological7processes7that7create7local7fluid7flowH7effective7stressH7and7temperature7anomalies.7

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77The7landscape7serves7as7a7link7between7the7solid7Earth7and7the7atmos777phere.7At7many7spatial7and7temporal7scalesH7landscape7morphology7and7topography7provide7a7constraint7on7the7tectonics7of7the7Earth7and7processes7active7within7it.7To7unravel7theseH7we7need7to7understand7the7complex7relationships7between7surface7processesH7their7drivers7and7the7rocks7upon7which7they7act.7I7will7explore7recent7developments7in7modelling7tectonics7and7surface7processes7within7a7single7deformational7framework.7I7will7focus7on7collisional7settings7such7as7New7Zealand’s7Southern7AlpsH7SE7Alaska7and7the7Himalaya7where7rapid7uplift7combines7with7vigorous7climate7regimes7to7create7dynamic7landscapes.777

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